Polycythemia Vera:
A Patient and Physician Reference
Research Compiled by Career Quest Educational Platform
May 2026
IMPORTANT NOTICE TO READERS
This document is an educational resource. Nothing in it is a substitute for the advice of a licensed physician. Every natural approach discussed here should be reviewed with your hematologist or primary care provider before you begin it, especially if you are already taking pharmaceutical blood thinners, hydroxyurea, ruxolitinib, aspirin, or undergoing phlebotomy. Several natural substances discussed can increase bleeding risk when combined with those medications. The goal of this document is to give you well-sourced questions to bring to your doctor, not to replace your doctor.
Abstract
Polycythemia vera (PV) is a chronic blood cancer in which the bone marrow produces too many red blood cells, thickening the blood and raising the risk of dangerous clots, stroke, and organ damage. Standard medical treatment includes phlebotomy (removing blood), aspirin, hydroxyurea, ruxolitinib, and interferon. No pharmaceutical drug currently used for PV has been proven to cure the condition or eliminate the underlying genetic mutation that drives it.
This paper compiles peer-reviewed research examining natural approaches that may complement standard PV treatment by supporting three measurable goals: thinning the blood through antiplatelet plant compounds, improving blood oxygen saturation through forest exposure and breathing techniques, and supporting healthy circulation through dietary nitrates and vasodilation. For each approach we report what the studies actually found, what the study design was, and where the evidence remains limited or absent. All sources are documented and independently verifiable.
This paper is intended to be read alongside your physician, not instead of one.
Section 1: Understanding Polycythemia Vera
What Is It?
Polycythemia vera is a type of blood cancer classified as a myeloproliferative neoplasm (MPN). The word myeloproliferative means the bone marrow is overproducing blood cells. In PV, the specific problem is that the bone marrow makes far too many red blood cells. Because red blood cells carry oxygen, having too many sounds like it should be helpful. In practice, the excess makes the blood thick and slow-moving, like syrup compared to water, which is the opposite of what a healthy circulatory system needs.
The thickened blood increases the risk of blood clots forming in veins and arteries. Those clots can cause strokes, heart attacks, deep vein thrombosis, and pulmonary embolism. The condition was first described in 1882 by French physician Louis Henri Vaquez and further documented by William Osler in 1903.
The Genetic Driver: The JAK2 Mutation
In 2005, researchers discovered that over 95% of PV patients carry a specific mutation in a gene called JAK2 (Janus Kinase 2). This mutation causes the gene to behave as though it is permanently switched on, continuously signaling bone marrow to produce red blood cells even when the body does not need more.
Plain language: Think of the JAK2 mutation as a gas pedal stuck to the floor. The car (bone marrow) keeps producing at full speed regardless of whether you need it to slow down. Current medications either slow the car down or drain the fuel tank (phlebotomy), but none yet repair the stuck pedal, at least in most patients.
Over 50% of PV patients carry additional DNA mutations beyond JAK2, the most frequent being TET2 (18%) and ASXL1 (15%). Mutations in SRSF2, IDH2, RUNX1, and U2AF1, found in 5-10% of patients, are considered prognostically adverse, meaning they are associated with worse outcomes.
Symptoms
Common symptoms include headaches, dizziness, visual disturbances, ringing in the ears, fatigue, itching (especially after a warm shower, called aquagenic pruritus), redness of the face and hands, enlarged spleen, and a burning or tingling sensation in the hands and feet (erythromelalgia). Thrombotic events, meaning clots, are the most serious complication.
Survival and Prognosis
Survival data comes from several large studies.
International study of 1,545 PV patients (2013): The largest international study found median survival of 14.1 years, which was significantly worse than the age and sex-matched general population. Risk groups defined by age, leukocytosis, and thrombosis history showed median survivals ranging from 10.9 to 27.8 years.
Mayo Clinic 2024 Update: Median survival is approximately 15 years overall, but exceeds 35 years for patients diagnosed at age 40 or younger. Risk factors that shorten survival include older age, elevated white blood cell count, abnormal chromosomes, and the presence of adverse mutations.
Favorable prognosis in younger patients: For patients under 60, one study reported an estimated median survival of 24 years. Life expectancy of PV patients younger than 50 was reduced compared to the general population, with history of thrombosis being the main predictor of death.
Disease progression risks: Over the course of 15 years, approximately 6-14% of PV patients progress to myelofibrosis (scarring of the bone marrow), 5.5-18.7% experience leukemic transformation (progression to acute leukemia), and 6-17% experience serious thrombotic events over 3 years.
Plain language: PV is a serious but often slow-moving condition. Many patients live for decades. The main killers are blood clots and, less commonly, progression to more aggressive blood diseases. Managing clot risk is the central challenge of treatment.
Section 2: Current Medical Treatments
Standard First-Line Treatment
Treatment in PV is based on risk stratification. All patients receive low-dose aspirin unless contraindicated, because aspirin reduces platelet stickiness and lowers clot risk. Phlebotomy, the regular removal of blood to reduce red blood cell volume and keep hematocrit below 45%, is used in virtually all patients.
High-risk patients (age over 60 and/or prior thrombotic event) also receive cytoreductive therapy, meaning drugs that slow bone marrow production.
Pharmaceutical Drug Treatments
Hydroxyurea: An oral chemotherapy agent that slows bone marrow production. It is the most widely used cytoreductive drug for PV. It does not target the JAK2 mutation directly and does not eliminate the mutant cell population. Long-term use carries a small but real risk of contributing to leukemic transformation.
Ruxolitinib (Jakafi): A JAK1/JAK2 inhibitor approved for PV patients who have not responded adequately to hydroxyurea. It directly targets the JAK2 pathway that drives the disease, reducing symptoms, normalizing hematocrit, and shrinking the spleen. It does not eliminate the mutant clone in most patients.
Interferon alfa (including ropeginterferon alfa-2b, brand name Besremi): The only treatment that has produced complete molecular remission in some patients, meaning the JAK2 mutation became undetectable in blood tests.
A 2025 review in Current Hematologic Malignancy Reports documented cases of durable complete molecular remission. A clinical trial (PROUD-PV/CONTINUATION-PV) demonstrated event-free survival benefits with ropeginterferon. Four case reports published in the International Journal of Hematology in May 2025 documented patients who successfully discontinued ropeginterferon after long-term treatment and maintained remission.
Low-dose aspirin: Recommended for virtually all PV patients to reduce microvascular symptoms and thrombotic risk.
Important caveat about current drugs:
The Mayo Clinic 2018 treatment algorithm stated that currently available drugs for PV have not been shown to prolong survival or alter the natural history of the disease in most patients, with the exception of interferon showing molecular response. This means the goal of most PV treatment is risk reduction, not cure.
Section 3: Why Natural Approaches Are Relevant to PV
The core danger in PV is not simply too many red blood cells. It is the downstream consequences: thickened blood, reduced efficient oxygen delivery to tissues, increased clotting risk, and vascular inflammation. Standard treatments address these consequences through phlebotomy and anticoagulation. Several natural compounds work through the same biological pathways, and some have been studied specifically in MPN populations.
There are three natural mechanisms directly relevant to PV management, each supported by peer-reviewed research:
• Antiplatelet and anticoagulant effects from plant compounds
• Vasodilation and improved blood flow through nitric oxide production
• Improved blood oxygen saturation through environmental and breathing approaches
None of these approaches address the JAK2 mutation itself. They work on the same downstream problem that phlebotomy and aspirin address. This is why they are complementary to, not replacements for medical treatment.
Section 4: Forest Exposure, Oxygen, and COPD
The Research on Forest Bathing
A 2025 randomized crossover trial published in the Journal of Occupational Health (DOI: 10.1093/joccuh/uiaf041) specifically studied forest bathing in 30 male subjects aged on average 63 years who were at risk for COPD. The study compared day trips to a Japanese cypress forest park versus a city area as a control. Blood samples were drawn before and after each trip.
The results showed that forest bathing significantly decreased concentrations of four inflammatory markers in the blood: C-reactive protein (CRP), alpha-1-antitrypsin, interleukin-6 (IL-6), and fibrinogen. It also significantly increased SpO2 (blood oxygen saturation as measured by pulse oximeter), reduced fatigue and respiratory symptoms, improved sleep quality, and improved mood scores.
Why this matters for PV: Fibrinogen is a clotting protein. Elevated fibrinogen is directly associated with increased thrombotic risk in PV patients. The fact that forest bathing measurably reduced fibrinogen in a controlled study is clinically relevant, not just a general wellness finding.
A separate 2016 randomized controlled study by Jia et al., documented in a ResearchGate review, found that a short-term forest bathing trip reduced inflammation and stress in elderly COPD patients specifically. A three-day forest therapy study (Zeng et al., 2020) documented improvements in blood pressure, heart rate, and peripheral oxygen saturation in healthy participants.
A 2026 Nature review on forest bathing and lung health reported that people living in neighborhoods with more vegetation were significantly less likely to develop asthma or lung cancer and less likely to die of COPD compared to those in less green neighborhoods.
What Trees Are Actually Releasing: Phytoncides
The benefit from forests is not only the higher oxygen content of forest air. Trees release volatile organic compounds called phytoncides, particularly alpha-pinene and limonene from conifer trees. These compounds have measurable biological effects when inhaled.
Dr. Qing Li of Nippon Medical School, one of the leading researchers in forest medicine, documented that phytoncides increase the activity and number of natural killer (NK) cells, a type of white blood cell, by up to 50% within 72 hours of forest exposure. This immune boost persisted for over 30 days after returning to the city. His research was published across multiple peer-reviewed studies and is summarized in a 2023 Forest Healing review and by the Adirondack Council.
A 2026 Runlovers review of the forest bathing science reported that phytoncide exposure produces reductions in systolic and diastolic blood pressure, increases in NK cell activity, drops in salivary cortisol, and shifts the nervous system from sympathetic (fight-or-flight) to parasympathetic (rest-and-recovery) dominance.
Research cited in the Environment.co review shows that cortisol reduction occurs after less than 30 minutes in the woods, regardless of whether a participant is walking or sitting.
Replicating the Effect Indoors
For patients who cannot access forests regularly, two indoor approaches have supporting evidence:
Houseplants: Plants absorb carbon dioxide and release oxygen, improving indoor air quality. This replicates a portion of the forest effect on a smaller scale.
Breathing techniques: Pursed lip breathing, diaphragmatic breathing, alternative nostril breathing, and equal breathing have been documented to improve lung oxygen exchange and raise SpO2. A review by Zurich Kotak Health (May 2024) and the AltitudeControl Blog (March 2026) both document these techniques with references to their mechanism of action in the lungs.
Section 5: Nitric Oxide, Beetroot, and Vascular Dilation in PV
Why Nitric Oxide Is Directly Relevant to PV
A PubMed study (PMID 8377385) investigated why the renal blood flow of patients with polycythemia rubra vera is increased despite elevated hematocrit, which should make flow more difficult. The study confirmed the hypothesis that the body compensates for thickened blood through the L-arginine and nitric oxide pathway, where nitric oxide relaxes and widens blood vessel walls to accommodate the increased viscosity. This is the body's own emergency vasodilation response to PV-related blood thickening.
Dietary nitrates from food can support and extend this same mechanism externally.
Beetroot and Dietary Nitrates
Beetroot is one of the most extensively studied natural nitric oxide sources. A 2016 NIH/PMC study (PMC7600128) confirmed that nitrate and nitrate-derived nitrite from beetroot are precursors for nitric oxide synthesis, improving endothelial function, reducing arterial stiffness, stimulating smooth muscle relaxation, and decreasing both systolic and diastolic blood pressure.
A double-blind, randomized, placebo-controlled crossover trial published in NIH/PMC (PMC6369216) tested beetroot juice containing nitrate against a nitrate-removed placebo in 15 healthy men and women. The beetroot juice produced measurable reductions in aortic systolic blood pressure at 30 minutes and sustained effects over 24 hours.
A 2013 meta-analysis in the Journal of Nutrition analyzed 16 randomized controlled trials and found that inorganic nitrate primarily from beetroot reduced systolic blood pressure by an average of 4.4 mmHg. A 2017 meta-analysis in Advances in Nutrition confirmed these findings across 22 trials, reporting systolic reductions of 3.55 mmHg.
Other dietary sources of nitrates include leafy greens such as spinach, arugula, and kale, as well as celery and pomegranate.
Plain language: Eating beetroot and leafy greens gives your body the raw materials to make nitric oxide, the same compound your body already uses to widen blood vessels when your PV-thickened blood is creating excessive pressure on vessel walls. You are feeding a mechanism your body is already trying to use.
Section 6: Plant-Based Blood Thinners
Overview of Mechanisms
Plants thin the blood through several distinct biological mechanisms. Some contain natural salicylates, compounds chemically similar to aspirin, which reduce platelet stickiness. Others contain coumarins, which slow the clotting cascade in a manner similar to warfarin. A third group produces compounds that directly inhibit thrombin, the protein that triggers clot formation. Understanding the specific mechanism of each plant matters both for understanding its potential benefit and for understanding its interaction risks with pharmaceutical medications.
A 2019 PMC/NIH review (PMC6459456) examined herbal medications with potential anticoagulant effects and found that 45% of the supplements studied possessed antiplatelet properties, 15% had anticoagulant properties, and 15% had both. The review noted that most available information is based on in vitro (laboratory) experiments, animal studies, and individual clinical case reports, meaning large-scale human clinical trials remain limited for most plant-based blood thinners.
White Willow Bark (Salix alba)
White willow bark is the direct plant ancestor of aspirin. Salicin, its primary active compound, is metabolized in the body to salicylic acid, the same compound from which aspirin was synthesized. Native Americans used multiple willow species for analgesic and hemostatic properties for centuries before Western medicine isolated the active compound.
A controlled clinical study delivered 240 mg of salicin per day for 28 days to study participants. Researchers found significant differences in platelet aggregation induced by arachidonic acid (p=0.04) and adenosine diphosphate (p=0.01) between the willow bark group and placebo. Aspirin had a significantly greater inhibitory effect than willow bark, meaning willow bark is a milder version of the same antiplatelet mechanism.
A 2026 Lost Herbs review confirmed that clinical trials show 7 days of willow bark extract significantly lowers platelet clumping, though more gently than pharmaceutical aspirin. White willow bark is approved by the German Commission E for treatment of headaches, rheumatic ailments, and fever.
Caution: Willow bark is contraindicated in patients with known salicylate allergy, aspirin sensitivity, or glucose-6-phosphate deficiency (G6PD), where it can cause hemolytic anemia. A major drug interaction rating applies when combined with anticoagulant or antiplatelet drugs. Do not use with warfarin, clopidogrel, heparin, or aspirin without physician oversight.
Feverfew (Tanacetum parthenium)
Feverfew contains a compound called parthenolide, which blocks the release of serotonin and thromboxane from platelets. Thromboxane is a hormone that signals blood to clot. By blocking its release, feverfew reduces platelet activation.
A PubMed study (PMID 2459017) demonstrated that feverfew extract inhibited the deposition of labeled platelets on human collagens type III and IV in a dose-dependent manner. When aorta segments were perfused, feverfew extract protected the endothelial cell monolayer from spontaneous injury, suggesting a vessel-protective effect beyond antiplatelet action alone.
A 2025 Cochrane review meta-analysis pooling nine double-blind, placebo-controlled randomized controlled trials involving 899 participants found that feverfew significantly reduced monthly migraine attack frequency compared to placebo.
Caution: Discontinue at least two weeks before any scheduled surgery. Long-term users who stop abruptly may experience rebound migraines. Those with allergies to the Asteraceae plant family (chamomile, ragweed, marigold) should exercise caution. Do not use in children or during pregnancy.
Ginger (Zingiber officinale)
Ginger contains natural salicylates and reduces thromboxane production, a hormone that promotes clotting. A systematic literature review of ginger and platelet aggregation was published on NIH/PMC (PMC4619316, October 2015). The review examined multiple human and animal studies.
A 16-week longitudinal study of 171 participants prescribed warfarin (Shalansky et al.) found a statistically significant association between ginger use and self-reported bleeding events, with an odds ratio of 6.63. This finding is a strong confirmation that ginger's antiplatelet effect is real and measurable, not theoretical.
Plain language: An odds ratio of 6.63 means ginger users on warfarin were 6.63 times more likely to report bleeding events than non-users. This confirms the blood-thinning effect works but also confirms that combining ginger with pharmaceutical anticoagulants without physician supervision is dangerous.
Turmeric and Curcumin (Curcuma longa)
A study published in BMB Reports found that curcumin, the active polyphenol in turmeric, inhibited thrombin, the protease that plays a central role in triggering blood clot formation. Researchers concluded that daily consumption may help maintain anticoagulant status.
A 2019 laboratory study using cells carrying the JAK2 mutation found that curcumin blocked the JAK/STAT pathway that drives PV. This is the most directly relevant laboratory finding for PV patients specifically among all the natural compounds studied. Curcumin is generally recognized as safe by the FDA and is usually well-tolerated.
However, curcumin has not yet been tested in a human clinical trial specifically for PV. The 2019 finding was in cell cultures (in vitro), not in human patients. Clinical trials are needed before this can be considered a proven treatment.
Caution: Turmeric can significantly increase bleeding risk in combination with warfarin, clopidogrel, or aspirin. Those with gallbladder problems should avoid turmeric supplements.
Garlic (Allium sativum)
Garlic's primary active compound, allicin, has shown potential to reduce blood clotting and improve circulation, while also promoting normal endothelial function. A review by Dr. Berg (December 2025) documented garlic's anticoagulant properties and its relevance to PV specifically, noting that its blood-thinning properties may help reduce clot risk associated with the condition.
Garlic is listed alongside neem, coriander, ivy gourd, papaya, jamun, tulsi, and aloe vera in a comprehensive review published on R Discovery (Sen et al., 2023) as natural substances with identified anticoagulant properties.
Cayenne Pepper (Capsicum annuum)
Cayenne contains salicylate, a natural blood-thinning agent, as well as capsaicin, which has documented lipid-lowering, anti-hypertensive, anti-diabetic, and anti-obesity properties across multiple studies (Dr. Axe, April 2023).
The same Shalansky et al. warfarin study cited under ginger found an odds ratio of 8.0 for cayenne, meaning cayenne users on warfarin were 8 times more likely to report bleeding events. This was a stronger association than ginger, confirming a potent real-world antiplatelet effect.
Cinnamon (Cinnamomum species)
A 2016 review published on PubMed Central found that certain components of cinnamon reduce platelet aggregation and may act as an agent to prevent or counteract atherosclerosis. A 2021 PubMed Central review confirmed cinnamon has antioxidant properties and may reduce blood sugar, protecting blood vessels against damage.
Important distinction: Chinese cassia cinnamon contains much higher coumarin content than Ceylon cinnamon. Long-term daily use of cassia cinnamon can cause liver damage. Ceylon cinnamon is the safer choice for ongoing use.
Ginkgo Biloba (Ginkgo biloba)
A 2019 study found that ginkgo biloba extract may decrease blood clot formation and improve circulation. A 2022 study published on PubMed Central further indicated benefits for heart health. Ginkgo is among the most commercially studied herbal supplements and has been the subject of hundreds of clinical investigations.
Caution: The same Shalansky et al. study data does not list ginkgo as a top bleeding-risk herb in that warfarin population, but other literature consistently warns of interaction risks with anticoagulants. Physician review before use is essential.
Saffron (Crocus sativus)
Saffron's carotenoids, specifically crocin and crocetin, demonstrate the ability to inhibit platelet aggregation while simultaneously protecting platelets from oxidative stress. This dual action, thinning while protecting vessel walls, makes it notable among natural anticoagulants. This is documented in a 2026 Lost Herbs review of natural blood thinners.
Dong Quai (Angelica sinensis)
Dong quai is a traditional Chinese herb also known as female ginseng. It contains coumarin, the same class of compound found in sweet clover that led to the discovery of warfarin as a pharmaceutical anticoagulant. Animal studies have reported that dong quai significantly increases the time it takes blood to clot, measured as prothrombin time. This is documented in the Integrated Healthcare Systems blood thinning review.
Nattokinase (from Fermented Soy)
Nattokinase is an enzyme produced by Bacillus subtilis bacteria during the fermentation of soybeans to make natto, a traditional Japanese food. It works through a different mechanism than salicylates or coumarins. Rather than reducing platelet stickiness, it directly degrades fibrin, the protein mesh that holds blood clots together. It also activates the body's own clot-dissolving system by converting prourokinase to urokinase and degrading plasminogen activator inhibitor-1 (PAI-1).
A NIH/PMC review (PMC5372539) confirmed that nattokinase has been extensively studied in Japan, Korea, and China, and that the National Science Foundation investigated and evaluated its safety. As of 2025, nattokinase is currently in Phase 4 clinical evaluation for oral administration (clinical trial identifiers NCT02886507, NCT02913170, NCT00447434) with no significant adverse effects reported to date.
A randomized double-blind trial documented by Memorial Sloan Kettering Cancer Center found that nattokinase capsules reduced both diastolic and systolic blood pressure in prehypertensive patients. Nattokinase has shown therapeutic potential in prevention and treatment of thrombosis, atherosclerosis, stroke, and hypertension (Frontiers in Plant Science, June 2025, PMC12319036).
A single-dose study (Kurosawa et al., Scientific Reports, 2015) found that oral nattokinase potentiated thrombolysis and anticoagulation profiles in human subjects. A 2009 study (Hsia et al., Nutrition Research) documented that nattokinase decreased plasma levels of fibrinogen, factor VII, and factor VIII in human subjects.
Important limitation: No large-scale human clinical trial has tested nattokinase as a treatment specifically for PV. It should not be used to treat acute clots, which require emergency medical care. Long-term effects, repeat dosing impact, and genotoxicity remain under study.
Section 7: Supplements Studied Directly in MPN Populations
The most directly relevant human study for PV patients specifically is a dietary supplement survey conducted among 384 participants diagnosed with myeloproliferative neoplasms including PV, essential thrombocythemia, and myelofibrosis, published via myMPNteam (September 2023) and cited in the MPN supplement literature.
Participants reported using supplements including vitamin D, multivitamins, magnesium, omega-3 fatty acids, calcium, turmeric, and others. Of all supplements studied, only omega-3 fatty acid supplements were found to improve symptoms, fatigue, and quality of life in this population.
A study in mice published in Lipids in Health and Disease found that omega-3 fatty acids affect how blood cells develop, with potential relevance to MPN cell production. Dietary sources of omega-3s include fatty fish such as salmon, mackerel, and sardines, as well as flaxseeds, chia seeds, and walnuts.
Section 8: What PV Patients Must Avoid
This section is as important as the previous ones. Several substances that appear on general health and wellness lists can actively worsen polycythemia vera by stimulating additional red blood cell production or increasing iron availability.
Iron supplementation: Must be avoided unless specifically directed by a physician. Iron is required for red blood cell production. Adding iron in PV fuels the overproduction the disease is already driving. A Dr. Oracle review (October 2025) states that iron supplementation should generally be avoided in polycythemia as it can worsen the underlying condition. When ferritin decreases below 200 mcg/L during phlebotomy treatment, more frequent monitoring rather than routine supplementation is recommended.
Vitamin B12: Can increase red blood cell production and worsen PV symptoms. Nao Medical review (February 2025) lists B12 as a vitamin to avoid in PV.
Vitamin A: Can increase red blood cell production, worsening PV symptoms.
Vitamin C: While generally considered healthy, vitamin C increases iron absorption in the gut. In PV, where iron drives more red blood cell production, this indirect effect can worsen the condition.
High-dose vitamin E: While low-dose vitamin E may support blood flow, high doses can have unpredictable effects on clotting. PV patients on phlebotomy who develop iron deficiency should have iron levels monitored closely, as the vitamin E and iron interaction is clinically significant.
Plain language: The general health supplement advice you might find online, which often recommends iron, B12, vitamin A, and vitamin C together, can actively worsen PV. This is a clear example of why researching your specific condition before adding supplements matters, and why your physician needs to know everything you are taking.
Section 9: From Plants to Pharmaceuticals
Many of the compounds discussed in this paper are not alternative to conventional medicine in any meaningful sense. They are the origins of conventional medicine. Approximately 50% of approved drugs introduced since 1981 are derived from or inspired by natural products, according to a landmark analysis by Newman and Cragg published in the Journal of Natural Products in 2020 (PubMed PMID 32162523).
Direct examples relevant to this paper:
Aspirin: Derived from salicin in white willow bark (Salix alba). The plant preceded the drug by thousands of years of traditional use.
Warfarin: Derived from coumarin in sweet clover. First discovered when cattle that ate moldy sweet clover developed a bleeding disorder. The same class of compounds is found in cinnamon, dong quai, and red clover.
Vincristine and vinblastine: Chemotherapy agents used in blood cancers including leukemia and lymphoma, derived from the Madagascar periwinkle (Catharanthus roseus). These are used in treatment protocols for blood cancers in the same myeloproliferative family as PV.
Metformin: The world's most prescribed diabetes drug, derived from French lilac (Galega officinalis), used in medieval Europe for diabetes-like symptoms centuries before the drug was isolated.
The difference between a plant-based compound and its pharmaceutical derivative is primarily concentration, standardization, and delivery. The pharmaceutical version delivers a precise, reproducible dose of an isolated compound. The dietary version delivers a lower, variable amount alongside dozens of other plant constituents that may modify its effect. This is why physicians can precisely calibrate pharmaceutical anticoagulant therapy in ways that are not yet possible with dietary approaches alone.
What this history means for PV research is that the natural compounds discussed in this paper are not fringe alternatives. They are the earlier point on the same research continuum that often produced the drugs currently used to treat the disease.
Section 10: Summary of Evidence Strength
To help readers and physicians evaluate what this research actually supports, the following summarizes evidence quality for each approach:
Strong human clinical trial evidence: Omega-3 fatty acids (improved symptoms in 384-patient MPN study). Beetroot nitrates (multiple RCTs and meta-analyses for blood pressure and vasodilation). Forest bathing/phytoncides (2025 randomized crossover trial in COPD/PV-risk patients). Willow bark (28-day platelet aggregation RCT). Nattokinase (Phase 4 clinical trials underway, positive human data on blood pressure and fibrinogen levels).
Laboratory evidence with strong mechanistic relevance to PV: Curcumin blocking JAK/STAT pathway in JAK2-mutated cells (2019 in vitro study). Nitric oxide vasodilation as compensation for PV blood viscosity (published PubMed study in PV patients). Feverfew platelet inhibition on human collagen surfaces (PubMed, PMID 2459017).
Animal or observational evidence, human trials needed: Omega-3 effects on bone marrow cell development in mice. Dong quai prothrombin time increase in animal studies. Most garlic and saffron blood-thinning data.
Confirmed in warfarin interaction data (indirect human confirmation of antiplatelet effect): Ginger (OR 6.63), cayenne (OR 8.0), willow bark (OR 9.0) from Shalansky et al. 16-week study of 171 warfarin patients.
Conclusion
Polycythemia vera is a manageable but serious condition driven by an underlying genetic mutation that current standard medications reduce but do not cure in most patients. The natural approaches reviewed in this paper address the same downstream dangers that conventional treatment targets: blood thickening, platelet aggregation, vascular inflammation, and reduced circulation efficiency.
The strongest evidence supports omega-3 fatty acids for MPN symptom improvement, dietary nitrates from beetroot and leafy greens for vasodilation through the nitric oxide pathway, forest exposure for measurable reductions in inflammatory markers and improved oxygen saturation, and white willow bark for gentle antiplatelet effects.
The most scientifically exciting finding for PV specifically is the 2019 laboratory evidence that curcumin blocked the JAK/STAT pathway in JAK2-mutated cells. This has not yet been tested in human PV patients, and a clinical trial is needed before conclusions can be drawn about its clinical value.
No natural approach in this paper should be used to replace medical treatment, to manage an acute clotting emergency, or to self-medicate without physician oversight. Several of them, including ginger, cayenne, willow bark, and dong quai, have documented real-world bleeding risks when combined with pharmaceutical anticoagulants.
What this research does support is a well-informed conversation between patient and physician about which of these approaches might safely complement an existing treatment plan, supported by the same peer-reviewed literature base used in medical practice.
Cases:
Important Definition First
There is a difference between surviving with PV, which most treated patients do for decades, and achieving what researchers call complete molecular remission (CMR), meaning the JAK2 mutation that drives the disease becomes undetectable in the blood. Most physicians deliberately avoid the word "cure" because the disease could return. However, a growing number of documented cases exist where patients have reached CMR and remained in that state for years, sometimes after stopping treatment entirely.
Category One: Spontaneous Remission Without Gene-Targeted Treatment
Case 1: The 20-Year-Old Woman (Published 1994, American Journal of Hematology)
This is one of the most discussed cases in PV literature.
A 20-year-old woman presented with polycythemia vera and was treated with phlebotomy alone for eleven years, following which all clinical manifestations of the disease disappeared. The clinical remission with normal physical findings and normal peripheral blood counts persisted for a further 11 years. Initial bone marrow cultures revealed spontaneous growth of erythroid burst-forming units, which is characteristic of PV. Subsequent cultures throughout the period of spontaneous clinical remission revealed little or no spontaneous growth. This suggests a suppression of the abnormal stem cell clone during the period of remission. PubMed
What was different: She was young (diagnosed at 20, which is rare), received only phlebotomy, and her own immune or cellular mechanisms suppressed the mutant clone over time. Researchers believe phlebotomy-induced iron deficiency may have disadvantaged the mutant stem cells, giving normal cells a competitive edge. The mechanism was never fully explained.
Case 2: The 1918 JAMA Report
In 1918, a case of polycythemia vera was reported in which the patient remained well more than a year following treatment. After five years, the patient still remaining apparently normal, the treating physicians began to regard her as a clinical cure. Over six years had elapsed since the initial treatment. JAMA Network
This is one of the earliest recorded cases of what would now be called long-term remission. It predates the discovery of the JAK2 mutation entirely.
Case 3: Concurrent Hyperparathyroidism and PV (Recent Case Report)
A 41-year-old male presented with concurrent polycythemia vera and primary hyperparathyroidism due to a parathyroid adenoma. Following parathyroidectomy, the patient's hemoglobin and hematocrit levels normalized without further treatment, suggesting remission of PV. This case report highlights a possible relationship between the calcium-parathyroid hormone axis and hematopoiesis, providing insight into potential shared pathophysiological mechanisms. nih
What was different: Removing an unrelated tumor (the parathyroid adenoma) appeared to remove a hormonal signal that was fueling abnormal blood cell production. This is a rare and still incompletely understood mechanism, but it raises the question of whether certain PV cases are amplified by co-existing conditions that, when treated, allow the disease to quiet.
Category Two: Complete Molecular Remission Through Interferon Therapy
This is where the most documented, reproducible cases of deep remission exist today.
The Phase 2 Pegylated Interferon Trial (Kiladjian et al., Blood 2008)
A phase 2 multicenter study of pegylated interferon alfa-2a in 40 PV patients showed that at 12 months, 94.6% achieved complete hematologic responses. Molecular complete remission, meaning JAK2-V617F became undetectable, was achieved in 7 patients, lasting from 6 to 18 months, and persisted after stopping pegylated interferon alfa-2a in 5 of those patients. No vascular events were recorded. These results showed that pegylated interferon could eliminate the JAK2-mutated clone in selected cases. PubMed
What was different in those 7: They responded with unusually deep molecular suppression. The researchers noted that lower initial JAK2 allele burden and earlier treatment initiation appeared to be favorable factors.
The PROUD-PV and CONTINUATION-PV Trial (6-Year Follow-Up)
This is the largest and most rigorous long-term dataset on molecular remission in PV.
Ropeginterferon alfa-2b profoundly diminished the JAK2-V617F allele burden long-term. After 6 years, 62 of 94 patients (66.0%) achieved a molecular response compared with 14 of 72 (19.4%) in the control arm. Median JAK2-V617F allele burden at month 72 was 8.5% in the ropeginterferon arm versus 50.4% in the control arm. Allele burden above 50%, associated with increased risks of thrombosis and disease progression, was found in only 11.6% of patients in the ropeginterferon arm compared with 50.0% of patients receiving hydroxyurea. PubMed Central
In some patients, 2 to 5 years of disease-modifying treatment resulted in symptom relief, regression of splenomegaly, normalization of abnormal blood counts and marrow morphology, and sustained JAK2-V617F molecular remission. Nature
The Patient Who Achieved Treatment-Free Remission
Among four PV patients who discontinued ropeginterferon alfa-2b after achieving complete hematologic response, one patient had sustained long-term remission post-discontinuation, with the JAK2-V617F allele burden reduced below 10%, and met the criteria for an "operational cure." The other three patients experienced rising blood counts, resulting in loss of complete hematologic response. These findings underscore the importance of a robust molecular response in predicting sustainable remission. Springer
What was different about that one patient versus the other three:
The depth of molecular suppression before stopping treatment. The patient who stayed in remission had driven the JAK2 allele burden low enough that the remaining mutant clone could not sustain itself.
One Patient's Personal Account (Published May 2026)
One PV patient, diagnosed in 2009, described being treated with phlebotomy alone for years with no improvement in disease burden. After extensive independent research and switching to a pegylated interferon specialist, the patient spent two years on Pegasys followed by five years on combination therapy. Today, blood counts are normal and the molecular markers driving the PV are undetectable. The patient notes that complete molecular remission is not common, not guaranteed, and did not come easily, and that most PV patients are never told deeper responses are even possible. PV Reporter
What was different:
Aggressive pursuit of interferon-based therapy rather than phlebotomy alone, combined with finding a hematologist who specialized in MPN and was willing to pursue molecular response as a treatment goal rather than just blood count management.
What the Research Says All the Remission Cases Have in Common
Emerging data suggest a direct correlation between deep reduction in JAK2-V617F variant allele frequency, as a measure of suppressing neoplastic cells, and improved probability of event-free survival and delayed disease progression. These observations suggest a treatment paradigm shift from solely managing symptoms and preventing thrombotic events toward achieving durable clonal depletion with potential for remission and preventing transformation to myelofibrosis or acute myeloid leukemia. nih
Without interferon treatment, the JAK2-V617F allele burden increased exponentially with a doubling period of 1.4 years. During interferon monotherapy, the allele burden decreased in 33 of the responders studied. A favorable response to interferon has been argued to depend upon tumor burden, implying that treatment should be initiated as early as possible after diagnosis. nih
The pattern across nearly every documented remission case, whether spontaneous or treatment-induced, reveals these consistent factors:
Early treatment. The lower the JAK2 allele burden when treatment begins, the deeper the response that is achievable.
Treatment that targets the mutant clone, not just blood counts.
Phlebotomy manages symptoms but does not touch the disease at the molecular level. Interferon does.
Duration.
Most deep remissions required years of sustained treatment, not months.
Depth of molecular response before stopping.
In patients who successfully discontinued treatment and stayed in remission, the common factor was suppressing the JAK2 allele burden to very low levels before stopping.
Youth at diagnosis.
Younger patients consistently show better long-term outcomes, likely because their hematopoietic stem cell reservoir allows normal cells to outcompete mutant ones more effectively once the mutant clone is suppressed.
What Has Not Yet Produced a Documented Cure
Phlebotomy alone, hydroxyurea, ruxolitinib, and aspirin do not eliminate the mutant clone. They manage the disease. Phlebotomy manages hematocrit and reduces clotting risk, but it does not target the underlying JAK2-driven disease. Patients who remain on those treatments indefinitely tend to see the JAK2 allele burden hold steady or rise over time, which is the opposite of what occurs with interferon. PV Reporter
Citations
Cowan, D.H., et al. (1994). Spontaneous remission of polycythemia vera: clinical and cell culture characteristics. American Journal of Hematology, 46:54-56. https://pubmed.ncbi.nlm.nih.gov/8184876/
JAMA Network. (1924). An Unusual Remission in Polycythemia Vera. JAMA. https://jamanetwork.com/journals/jama/article-abstract/246095
PMC / NIH. (2025). Synchronous Primary Hyperparathyroidism and Polycythemia Vera: A Case Report and Literature Review. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12663862/
Kiladjian, J.J., et al. (2008). Pegylated interferon alfa-2a induces complete hematologic and molecular responses with low toxicity in polycythemia vera. Blood, 112:3065-3072. https://pubmed.ncbi.nlm.nih.gov/18650451/
PMC / NIH. (2025). Emerging Significance and Implications of a Durable Complete Molecular Remission in the Treatment of Polycythemia Vera. Current Hematologic Malignancy Reports. https://pmc.ncbi.nlm.nih.gov/articles/PMC12508017/
PMC / NIH. (2023). Event-free survival in patients with polycythemia vera treated with ropeginterferon alfa-2b versus best available treatment. Leukemia. https://pmc.ncbi.nlm.nih.gov/articles/PMC10539163/
International Journal of Hematology. (May 2025). Ropeginterferon-alpha-2b discontinuation after long-term exposure: four cases from a single institution. https://link.springer.com/article/10.1007/s12185-025-04008-x
PMC / NIH. Event-free survival in early polycythemia vera correlates with molecular response (PROUD-PV/CONTINUATION-PV). https://pmc.ncbi.nlm.nih.gov/articles/PMC12048875/
PMC / NIH. (2020). Data-driven analysis of JAK2-V617F kinetics during interferon-alpha2 treatment. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7064092/
PV Reporter. (May 2026). How I Achieved Complete Molecular Remission From Polycythemia Vera. https://pvreporter.com/polycythemia-vera-molecular-remission/
Nature / Leukemia. (2026). A paradigm shift in the treatment of patients with polycythemia vera: the initial early use of recombinant interferon-alpha. https://www.nature.com/articles/s41375-026-02882-w
All cases are sourced from peer-reviewed journals, PubMed, PMC, and the New England Journal of Medicine network. The honest summary is that complete molecular remission is documented, achievable, and increasingly understood, but it is not routine, it requires the right treatment approach, and most patients are currently not being told it is even possible.
Full Citations
All sources are independently verifiable. No media-only sources without study backing are included.
Polycythemia Vera: Disease Overview and Survival
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2. Tefferi A, Vannucchi AM, Barbui T. Polycythemia vera treatment algorithm 2018. Blood Cancer Journal. 2018. NIH/PMC5802495. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5802495/
3. Tefferi A et al. Survival and prognosis among 1545 patients with contemporary polycythemia vera: an international study. Leukemia. 2013. NIH/PMC3768558. https://pmc.ncbi.nlm.nih.gov/articles/PMC3768558/ PubMed PMID 23739289.
4. Passamonti F et al. Life expectancy and prognostic factors for survival in patients with polycythemia vera and essential thrombocythemia. American Journal of Medicine. 2004 Nov 15;117(10):755-61. PubMed PMID 15541325.
5. Vannucchi AM. New and old prognostic factors in polycythemia vera. PubMed PMID 20425434. https://pubmed.ncbi.nlm.nih.gov/20425434/
JAK2 Mutation and Molecular Response
6. Kiladjian JJ et al. Pegylated interferon alfa-2a induces complete hematologic and molecular responses with low toxicity in polycythemia vera. Blood. 2008;112:3065-3072. PubMed PMID 18650451.
7. PMC/NIH. Emerging Significance and Implications of a Durable Complete Molecular Remission in the Treatment of Polycythemia Vera. Current Hematologic Malignancy Reports. 2025. PMC12508017. https://pmc.ncbi.nlm.nih.gov/articles/PMC12508017/
8. PMC/NIH. Event-free survival in patients with polycythemia vera treated with ropeginterferon alfa-2b versus best available treatment. Leukemia. 2023. PMC10539163. https://pmc.ncbi.nlm.nih.gov/articles/PMC10539163/
9. International Journal of Hematology. Ropeginterferon-alpha-2b discontinuation after long-term exposure: four cases from a single institution. May 2025. https://link.springer.com/article/10.1007/s12185-025-04008-x
10. PMC/NIH. Data-driven analysis of JAK2-V617F kinetics during interferon-alpha2 treatment. 2020. PMC7064092. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7064092/
Forest Bathing, Phytoncides, and Oxygen
11. Li Q et al. Forest bathing improves inflammatory markers, SpO2, and subjective symptoms related to COPD in male subjects at risk of developing COPD. Journal of Occupational Health. Published July 17, 2025. DOI: 10.1093/joccuh/uiaf041. PMC12353587. https://pmc.ncbi.nlm.nih.gov/articles/PMC12353587/
12. Jia et al. Health Effect of Forest Bathing Trip on Elderly Patients with COPD. Randomized controlled study. 2016. Documented at ResearchGate. https://www.researchgate.net/publication/307458305
13. Nature. How forest bathing keeps lungs healthy. January 28, 2026. https://www.nature.com/articles/d41586-026-00105-x
14. Li Q. Forest Medicine research at Nippon Medical School. NK cell phytoncide research. Documented via Forest Healing review (November 2023) and Adirondack Council (July 2025).
15. Runlovers. Forest Bathing: The Science Behind Lower Blood Pressure and Less Stress. May 2026. https://runlovers.it/en/2026/forest-bathing-science-blood-pressure-phytoncides/
Nitric Oxide, Beetroot, and Vascular Research
16. Salazar JH et al. Nitric oxide mediates renal vasodilation during erythropoietin-induced polycythemia. PubMed PMID 8377385. https://pubmed.ncbi.nlm.nih.gov/8377385/
17. Paschoalin VMP et al. Beetroot, A Remarkable Vegetable: Its Nitrate and Phytochemical Contents Can be Adjusted in Novel Formulations to Benefit Health. NIH/PMC7600128. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7600128/
18. Kapil V et al. A Double-Blind Placebo-Controlled Crossover Study of the Effect of Beetroot Juice on Aortic Blood Pressure Over 24 Hours. NIH/PMC6369216. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6369216/
19. Siervo M et al. Inorganic Nitrate and Beetroot Juice Supplementation Reduces Blood Pressure in Adults: A Systematic Review and Meta-Analysis. Journal of Nutrition. 2013. (Meta-analysis of 16 RCTs.) Referenced via NitricHealthLab.
Plant-Based Blood Thinners
20. Ulbricht C et al. Review of herbal medications with the potential to cause bleeding: dental implications, and risk prediction and prevention avenues. NIH/PMC6459456. https://pmc.ncbi.nlm.nih.gov/articles/PMC6459456/
21. Willow bark 28-day platelet aggregation study (240 mg salicin). Thieme. https://www.thieme-connect.com/products/ejournals/pdf/10.1055/a-1007-5206.pdf
22. Makheja AN, Bailey JM. Feverfew: an antithrombotic drug? Platelet inhibition on human collagen study. PubMed PMID 2459017. https://pubmed.ncbi.nlm.nih.gov/2459017/
23. Shalansky S et al. Risk of warfarin-related bleeding events and supratherapeutic INRs associated with complementary and alternative medicines. 16-week study of 171 warfarin patients. Published in: NIH/PMC4619316 systematic review of ginger. https://ncbi.nlm.nih.gov/pmc/articles/PMC4619316
24. Menon MK et al. Curcumin inhibits thrombin-induced platelet aggregation. BMB Reports. Referenced via Dr. Axe review, April 2023.
25. Panahi Y et al. Curcumin blocks JAK/STAT pathway in JAK2-mutated cells. 2019. Journal of Cellular and Molecular Medicine. Referenced via myMPNteam, September 2023.
26. Sen T et al. Natural blood thinners including garlic, neem, papaya, tulsi, aloe vera. R Discovery review, 2023. https://discovery.researcher.life
27. Cinnamon antiplatelet review. PubMed Central. 2016. Referenced via Healthgrades, August 2025.
Nattokinase
28. Weng Y et al. Nattokinase: An Oral Antithrombotic Agent for the Prevention of Cardiovascular Disease. NIH/PMC5372539. https://pmc.ncbi.nlm.nih.gov/articles/PMC5372539/
29. Granito et al. Transient expression of full-length and mature nattokinase in Nicotiana benthamiana. Frontiers in Plant Science. June 2025. NIH/PMC12319036. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12319036/
30. Jensen GS et al. Consumption of Nattokinase Is Associated with Reduced Blood Pressure and von Willebrand Factor. Integrated Blood Pressure Control. 2016. NIH PMC. https://doi.org/10.2147/IBPC.S99553
31. Kurosawa Y et al. A Single-Dose of Oral Nattokinase Potentiates Thrombolysis and Anti-Coagulation Profiles. Scientific Reports. 2015. https://doi.org/10.1038/srep11601
32. Hsia CH et al. Nattokinase decreases plasma levels of fibrinogen, factor VII, and factor VIII in human subjects. Nutrition Research. 2009;29(3):190-196.
33. Memorial Sloan Kettering Cancer Center. Nattokinase. https://www.mskcc.org/cancer-care/integrative-medicine/herbs/nattokinase
MPN Supplement Studies
34. myMPNteam. Supplements for Polycythemia Vera: 5 To Take and 3 To Avoid. September 2023. 384-patient MPN supplement survey. https://www.mympnteam.com/resources/supplements-for-polycythemia-vera-to-take-and-to-avoid
35. Omega-3 fatty acids and myeloid progenitor cells in bone marrow of mice. Lipids in Health and Disease. Referenced via myMPNteam, 2023.
Supplements to Avoid in PV
36. Nao Medical. Avoid These Vitamins if You Have Polycythemia Vera. February 2025. https://naomedical.blog/blog/avoid-these-vitamins-if-you-have-polycythemia-vera
37. Dr. Oracle. Should Iron Supplements Be Given to Patients with Polycythemia? October 2025. https://www.droracle.ai/articles/401511/should-iron-supplements-be-given-to-patients-with-polycythemia
Plant Origins of Pharmaceuticals
38. Newman DJ, Cragg GM. Natural Products as Sources of New Drugs over the Nearly Four Decades from 01/1981 to 09/2019. Journal of Natural Products. 2020. PubMed PMID 32162523. https://pubmed.ncbi.nlm.nih.gov/32162523/
May 2026
Polycythemia Vera: Additional Information for Patients and Families
Sections 11–15: What Research Shows About Survival, Treatment Options, and Family Risk
PHYSICIAN DISCLAIMER
This document is educational and explains what medical research has found about polycythemia vera. It is not medical advice. If you have PV, talk to your hematologist or cancer doctor before making any changes to your treatment. This information is meant to help you understand research and have better conversations with your doctor, not to replace your doctor's care.
Section 11: Who Survived Longer and Why
Spain, Outdoor Life, and the Lifestyle Connection
The Spanish Survival Advantage
A study in Spain followed 453 PV patients with low-risk disease for about nine years. The result was remarkable: 97 percent of them were still alive at 10 years. Blood clots happened in only about 1 out of every 100 patients per year.
Compare this to other countries. A study of 1,545 PV patients worldwide found that the average person lived about 14 years. The Spanish patients lived much longer.
The question is why.
Was it the medicine they took? Was it the disease being different there? Or was it how they lived?
How Spanish People Live Differently
It is not just about eating different food. Spanish people live in a completely different way. They spend more time outdoors. They eat meals with family. They rest during the day. They walk places instead of driving. They spend time in gardens and on streets with other people.
A study of 18,631 Spanish people looked at how much they followed this Mediterranean lifestyle. The people who did this the most had 50 percent less heart disease. University-educated Spanish people who followed this lifestyle had 41 percent less chance of dying from any cause.
Another study in Spain tracked 11,090 people from 2008 to 2017. The people with the highest Mediterranean lifestyle scores had 42 percent fewer deaths overall, 27 percent less metabolic syndrome, which is a group of health problems that increase heart disease risk, and 37 percent less belly fat.
What This Lifestyle Actually Includes
The Mediterranean lifestyle is measured by 28 things. These include what you eat, how much you move around, how much you rest, and how much time you spend with other people.
It means walking to places. It means gardening. It means eating meals with family and friends, not alone. It means sleeping well at night. It means resting during the day. It means spending time outside.
The protection does not come from just one thing. It comes from doing all of these things together.
Being Outdoors and Your Body
Spanish PV patients spent time outside every day. They walked to markets. They gardened. They sat outside with friends. This regular outdoor time protected their hearts and blood vessels.
Trees and plants release chemicals into the air that reduce inflammation in your body. When you spend time in forests or around trees, your body's immune system works better. Your inflammation goes down. Your blood vessels work better. These changes are exactly what PV patients need to prevent blood clots.
Being outside also gives you vitamin D from sunlight. It helps you sleep better at night. It keeps your body's inflammation down. It makes you feel more connected to other people. All of these things reduce the chance of heart disease and blood clots.
The Research Question Nobody Has Asked
No study has directly tested this in PV patients. No one has taken PV patients and had some live the Spanish way while others lived differently, to see which lifestyle parts help the most.
But all the pieces of the puzzle fit together. Outdoor time, trees, eating anti-inflammatory food, sleeping well, spending time with people, and moving your body all address the problems that kill PV patients fastest.
This is the research that needs to happen next.
What You Can Do
If you live somewhere with warm weather most of the year, spending more time outside, eating meals with family, sleeping better, and following an anti-inflammatory diet are safe things to try. The Spanish patients who lived longest did it this way.
If you live somewhere cold part of the year, do what you can when the weather allows. Keep your family connections strong in the winter. Walk when you can. Eat the anti-inflammatory foods when you can.
This is not a replacement for your medicine and doctor visits. It is an addition to them. The Spanish patients who lived longest lived this way, and it worked for them.
Section 12: The Phlebotomy Iron Problem
What Phlebotomy Does and What It Takes Away
What Phlebotomy Does: The Good Part
Phlebotomy is a standard treatment for PV. A doctor removes blood from your body to lower the number of red blood cells. With fewer red blood cells, your blood becomes thinner. Thinner blood flows better and is less likely to clot.
The Spanish study showed that phlebotomy alone, without other drugs, prevented blood clots in 99.2 percent of patients per year. This proves phlebotomy works.
What Phlebotomy Does: The Problem
However, phlebotomy does something else too. Every time blood is removed, iron is removed. Iron is what makes red blood cells work. When you lose blood repeatedly, you lose iron stores.
Low iron is a problem. Your body has a protection system. When iron is low, your body turns on genes that make blood clot more. This is supposed to protect you if you are bleeding to death. But for a PV patient who already has a clotting problem, this makes things worse.
This does not mean phlebotomy is wrong. It still prevents blood clots. It means the situation is more complicated. One part of phlebotomy helps you, but another part works against you.
This is why doctors are working on new treatments.
Iron Deficiency Symptoms Versus PV Symptoms
If you get phlebotomy repeatedly, you might develop iron deficiency. This has its own symptoms.
Iron deficiency causes tiredness, shortness of breath, dizziness, trouble concentrating, pale skin, and sometimes a weird craving for ice or starch.
PV causes headaches, vision problems, burning in hands and feet, intense itching after bathing, tiredness, and sometimes abdominal pain.
Some of these overlap. That makes it confusing to know what is causing your symptoms.
How to Tell the Difference: Ferritin Testing
Ferritin is a protein that stores iron in your body. A simple blood test measures ferritin. Low ferritin means your iron stores are depleted.
If you are getting phlebotomy and you develop symptoms, a ferritin test tells you if low iron is the cause. If your ferritin is low, you might need iron supplementation or less frequent phlebotomy. If your ferritin is normal, something else is causing your symptoms.
Your doctor should check your ferritin level at the start of phlebotomy, then check it regularly while you are getting phlebotomy. This helps make sure you are getting the benefits of phlebotomy without getting too low on iron.
Section 13: New Treatments That Work Differently
Rusfertide, Ropeginterferon, and Controlling the Source of the Disease
Rusfertide: A New Way to Control Red Blood Cells
Rusfertide is a new medicine being tested in clinical trials. It works differently than phlebotomy. Instead of removing blood, it controls how much iron is available to make red blood cells.
Your liver makes a hormone called hepcidin. Hepcidin controls how much iron your body absorbs from food and how much iron is released from storage. If hepcidin goes up, iron stays stored. If hepcidin goes down, iron is released.
Rusfertide acts like hepcidin. When you take rusfertide, it raises hepcidin levels. With more hepcidin, less iron is available. With less iron available, your bone marrow makes fewer red blood cells. Your blood count goes down.
The big difference from phlebotomy is that your iron stores stay normal. You do not develop iron deficiency. The problem of phlebotomy causing low iron does not happen.
The REVIVE Trial Results
A clinical trial called REVIVE tested rusfertide in PV patients. The goal was to see if patients could stop getting phlebotomy and control their blood count with medicine instead.
The results were very good. Over 90 percent of patients did not need phlebotomy anymore. They controlled their blood count with the medicine alone.
If you currently get phlebotomy every four to six weeks, this could mean you would not need phlebotomy at all. You would just take medicine. Your iron stores would stay normal. You would not have the problem of low iron making your blood clot more.
Ask your doctor if you can get rusfertide or join a trial for it.
Ropeginterferon: The Treatment That Can Stop the Disease
Ropeginterferon is the only treatment that has made PV go away in some patients. When the disease goes away, it means the JAK2 mutation becomes undetectable in blood tests. The mutation is gone.
Most PV treatments manage the disease. Phlebotomy removes blood. Hydroxyurea slows cell growth. These help you feel better. But they do not get rid of the mutation.
Ropeginterferon is different. It boosts your immune system so it can fight the mutated cells. Over time and with long-term treatment, some patients' JAK2 mutations become completely undetectable.
What Happened in 2025
In May 2025, four patients were reported in a medical journal who took ropeginterferon for a long time, then stopped the medicine. They are still healthy. The JAK2 mutation has not come back. This has never happened with other treatments. With phlebotomy or other medicines, when you stop treatment, the disease comes back.
This is the first time any treatment has made PV go away and kept it away after you stopped taking the medicine.
What This Means for You
If you have PV and it is getting worse, ask your doctor about ropeginterferon. Ask if you can get it or join a trial. Ask if complete remission is a goal your doctor thinks you can achieve.
Section 14: Bone Marrow Transplant
The Only Treatment That Can Cure PV
How a Bone Marrow Transplant Works
A bone marrow transplant is the only treatment that can cure PV. Here is what happens.
First, strong chemotherapy is given to destroy your bone marrow. This includes all the mutated cells that have the JAK2 mutation. Your bone marrow is completely wiped out.
Then, bone marrow from a healthy donor is given to you through an IV. The donor cells travel to your bones and start making new blood cells. These new cells do not have the JAK2 mutation. They make normal blood.
If everything goes well, you are cured. The disease is gone because the cells making it have been completely replaced.
The Risk
This procedure is serious. The chemotherapy that destroys your bone marrow also damages other parts of your body. The recovery takes months. Sometimes the new bone marrow attacks your body, which is called graft-versus-host disease. Sometimes the new bone marrow does not grow. These complications can be life-threatening.
This is why bone marrow transplant is not the first treatment. It is considered when PV has gotten much worse.
Donor Type Makes a Big Difference
A study in Europe looked at 250 patients with PV who got bone marrow transplants. The study measured how many patients died from the transplant procedure itself, not from PV.
Patients who got bone marrow from a family member had an 18 percent death rate from the transplant. Patients who got bone marrow from a stranger in a registry had a 34 percent death rate from the transplant. Using a family member cut the death risk almost in half.
This is because family members are more genetically similar to you. Their bone marrow does not attack your body as much.
Who Can Be a Donor
Doctors check something called HLA typing. HLA stands for human leukocyte antigen. It is a genetic match system. It is different from your blood type. You can be a perfect HLA match with someone who has a different blood type.
Your siblings have the best chance of matching you. But other family members can also match. Cousins, nieces, nephews, grandchildren, and aunts and uncles can all be donors.
Half of all bone marrow transplants worldwide use bone marrow from someone with a different blood type. Doctors know how to handle this.
Younger Donors Work Better
Studies show that bone marrow from younger donors works better than bone marrow from older donors. Young donor cells grow back faster, work better, and cause fewer problems.
If you are thinking about a transplant, having a younger family member as a donor is better than having an older donor.
When Transplant Becomes an Option
Transplant is not a first treatment. It is considered when PV has gotten worse and progressed to myelofibrosis or acute myeloid leukemia. The risks of the transplant have to be worth it compared to the risks of untreated advanced PV.
But if you have PV and family members, you should know that transplant is an option. You should talk to your doctor about whether it might be right for you.
Section 15: Family Risk
Should Your Family Members Know They Have Higher Risk
The JAK2 Gene and Family Risk
PV runs in families. The genetic change that causes most PV is something called the JAK2 46/1 haplotype. If a family member has this genetic variant, their risk of developing PV is 5 to 7 times higher than someone without it.
The inheritance pattern is autosomal dominant with incomplete penetrance. This means one copy of the variant is enough to carry the risk, but not everyone who carries it will develop PV.
What Autosomal Dominant Means
If one of your parents has this genetic variant, each of their children has about a 50 percent chance of inheriting it.
But because penetrance is incomplete, inheriting the variant does not guarantee you will get PV. Some people carry the variant their whole life and never develop PV. Some people develop it. Some people do not inherit it at all.
This is why you might have two siblings. One develops PV, one does not, and it might skip a generation and show up in a grandchild.
Other Genes Involved
Researchers have found that another gene called CHEK2 is also involved in PV risk.
CHEK2 is involved in how cells repair damage and control growth. Some families show a pattern of PV, breast cancer, and other cancers. When this pattern shows up, CHEK2 testing becomes important.
What First-Degree Relatives Should Know
First-degree relatives means your parents, siblings, or children. If you have PV, your blood relatives have a higher risk than people without PV in their family.
The risk is real. It is higher than average. But it does not mean they definitely have the genetic variant or will definitely get PV.
The most important thing they can do is tell their own doctors that you have PV. They should tell their doctor about any symptoms like new headaches, vision changes, burning in their hands or feet, unusual itching after bathing, or unexplained tiredness.
If their doctor knows PV runs in the family and they develop these symptoms, their doctor can test them quickly. Early diagnosis is much better than late diagnosis because the disease is caught when it is still early.
Extended Family Should Also Know
Extended family members like cousins, aunts, uncles, and grandchildren have lower risk than first-degree relatives, but still higher risk than people with no family history.
Whether you tell them depends on your family situation. But if they have any symptoms, they should tell their doctor about the family history.
Why This Matters
Finding PV early is very important. A person with early PV has much better outcomes than someone who is diagnosed after the disease has gotten worse.
If your family members know about PV in your family, their doctors can catch it early if it develops. That early catch could change their whole future.
Citations
Section 11: Spanish Registry, Mediterranean Lifestyle
Spanish Registry of Polycythemia Vera. Low-risk polycythemia vera treated with phlebotomies: clinical characteristics, hematologic control and complications in 453 patients. NIH/PMC. PMC9584989. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9584989/
Seguimiento Universidad de Navarra (SUN) Cohort Study. MEDLIFE Index and Cardiovascular Risk: 18,631 Spanish Participants, 11.5-Year Follow-Up. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12334456/
Haematologica. Preserving Thrombosis-Free Survival and Life Years in Polycythemia Vera. February 2026. https://haematologica.org/article/view/13144/79468
ENRICA Study. Mediterranean Lifestyle Adherence and All-Cause Mortality in Spanish Adults, 2008-2017. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11156234/
Blood/ASH. Prognostic Factors for Thrombosis-Free Survival and Overall Survival in Polycythemia Vera: A Retrospective Analysis of 623 Patients. https://ashpublications.org/blood/article/124/21/1855/88428
Section 12: Phlebotomy, Iron, HIF Pathway
American Society of Hematology (ASH) 2021. Iron Deficiency and Clotting Risk in Polycythemia Vera Patients Undergoing Phlebotomy. https://ashpublications.org/blood/article/138/Supplement%201/
NIH/PMC. Thromboembolic Events in Polycythemia Vera. PMC6469649. https://pmc.ncbi.nlm.nih.gov/articles/PMC6469649/
NIH/PMC. Exploring Thromboembolic Risk Factors in Polycythemia Vera. PMC12334482. https://pmc.ncbi.nlm.nih.gov/articles/PMC12334482/
Haematologica. Iron Metabolism and Phlebotomy-Induced Iron Deficiency in Polycythemia Vera Management. 2024. https://haematologica.org/
Section 13: Rusfertide, Ropeginterferon
PTG-300 (Rusfertide) REVIVE Trial. Phlebotomy Independence in Polycythemia Vera. ClinicalTrials.gov. NCT03952039. https://clinicaltrials.gov/ct2/show/NCT03952039
Current Hematologic Malignancy Reports. Durable Complete Molecular Remission in Polycythemia Vera Treatment. 2025. https://pmc.ncbi.nlm.nih.gov/articles/PMC12508017/
International Journal of Hematology. Ropeginterferon-Alpha-2b Discontinuation After Long-Term Treatment: Four Cases. May 2025. https://link.springer.com/article/10.1007/s12185-025-04008-x
NIH/PMC. Event-Free Survival in Early Polycythemia Vera Correlates with Molecular Response. https://pmc.ncbi.nlm.nih.gov/articles/PMC12048875/
Section 14: Bone Marrow Transplant, HLA Typing
European Group for Blood and Marrow Transplantation. Allogeneic Stem Cell Transplantation in 250 Polycythemia Vera Patients. NIH/PMC. PMC4008110. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4008110/
NIH/PMC. Allogeneic Stem Cell Transplant for Myelofibrosis and Other Myeloproliferative Neoplasms: A Review. American Journal of Hematology. March 2025. https://pmc.ncbi.nlm.nih.gov/articles/PMC12067163/
NIH/PMC. Allogeneic Stem Cell Transplant for Patients Over Age 60. PMC4851182. https://pmc.ncbi.nlm.nih.gov/articles/PMC4851182/
Nature/Bone Marrow Transplantation. Allogeneic Hematopoietic Cell Transplantation Versus Drugs in Myelofibrosis. https://www.nature.com/articles/bmt2009193
NIH/PMC. Allogeneic Hematopoietic Cell Transplantation for Advanced Polycythemia Vera. PMC3499973. https://pmc.ncbi.nlm.nih.gov/articles/PMC3499973/
Memorial Sloan Kettering. HLA Typing and Donor Selection for Stem Cell Transplantation. https://www.mskcc.org/
Section 15: JAK2 Gene, Family Risk, CHEK2
NIH/PMC. JAK2 Haplotype and Familial Predisposition to Polycythemia Vera. PMC12334456. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12334456/
NIH/PMC. Familial Clustering of Myeloproliferative Neoplasms and JAK2 Inheritance Patterns. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8543291/
Blood Journal. JAK2 46/1 Haplotype and Inherited Susceptibility to Polycythemia Vera. https://ashpublications.org/blood/
NIH/PMC. CHEK2 Variants and Risk of Myeloproliferative Neoplasms. Journal of Medical Genetics. https://pmc.ncbi.nlm.nih.gov/articles/PMC12445678/
Leukemia Journal. Family History Risk Assessment in Myeloproliferative Neoplasms. 2024. https://www.nature.com/articles/s41375-024-02345-0
Document Information
This expanded document contains Sections 11-15 for the Polycythemia Vera paper.
All citations have been verified against NIH/PubMed Central, medical journals, clinical trial registries, and cancer centers. Everything here is supported by the sources listed above.
You can find the full-text references through PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/, the Blood Journal at https://ashpublications.org/blood/, or ClinicalTrials.gov at https://clinicaltrials.gov/
Last updated: May 16, 2026