Primary myelofibrosis: the decisions you may face
5 treatment settings, 5 with more than one named option. Each section lays out the options the standard of care names, what each is for, the trials behind them with their recorded results, the side effects and cautions on record, and questions to ask. Built from the cancer page's standard-of-care rows; nothing here is advice for your case.
Lower-risk, asymptomatic
Observation; aspirin for thrombosis risk where platelets are high; hydroxyurea or interferon for proliferative features.
Aspirin is not a cancer drug but sits in cancer care in two places: low doses prevent clots in polycythaemia vera and essential thrombocythaemia, and long-term use lowers colorectal cancer in people with Lynch syndrome, while a trial in the healthy elderly found no benefit and possible harm.
Hydroxyurea is a cheap, decades-old pill that lowers high blood counts in polycythaemia vera and essential thrombocythaemia and is also the main drug for sickle cell disease.
Ropeginterferon alfa-2b is a long-acting interferon for polycythaemia vera that, unlike hydroxyurea, can shrink the mutant clone over years.
Peginterferon alfa-2b, a long-acting interferon, was approved in 2011 as Sylatron for melanoma that had spread to lymph nodes and been removed, to delay recurrence; checkpoint inhibitors have since replaced it in that role.
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
No side-effect rates or interaction flags are recorded for these options yet. The side-effect lookup and interaction checker cover the products that have them.
- Between Aspirin, Hydroxyurea (hydroxycarbamide), Ropeginterferon alfa-2b and the other options, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Myeloproliferative Neoplasms), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (lower-risk, asymptomatic), which of the standard options do you recommend and why?Why: Guideline options include: Observation; aspirin for thrombosis risk where platelets are high; hydroxyurea or interferon for proliferative features.
- Am I a candidate for Aspirin, Hydroxyurea (hydroxycarbamide), Ropeginterferon alfa-2b or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Add these to your appointment list, or take the full question set for this cancer.
Symptomatic splenomegaly or constitutional symptoms
Ruxolitinib (COMFORT-I and II) first; fedratinib after ruxolitinib failure or intolerance; pacritinib if platelets are below 50 x 10^9/L; momelotinib if anaemic.
Ruxolitinib was the first JAK inhibitor: it shrinks the spleen and relieves symptoms in myelofibrosis and controls blood counts in polycythaemia vera, without eliminating the disease clone.
A second JAK inhibitor for myelofibrosis that works after ruxolitinib fails; it carries a boxed warning for a rare brain toxicity (Wernicke encephalopathy) so thiamine is checked.
The JAK inhibitor for myelofibrosis patients whose platelet counts are too low for ruxolitinib.
Momelotinib is the JAK inhibitor designed for anaemic myelofibrosis patients: it can improve haemoglobin while shrinking the spleen.
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
- Reduce dose for CrCl below 60 with platelets under 150; dialysis dosing after each session.
- Between Ruxolitinib, Fedratinib, Pacritinib and the other options, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Myeloproliferative Neoplasms), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (symptomatic splenomegaly or constitutional symptoms), which of the standard options do you recommend and why?Why: Guideline options include: Ruxolitinib (COMFORT-I and II) first; fedratinib after ruxolitinib failure or intolerance; pacritinib if platelets are below 50 x 10^9/L; momelotinib if anaemic.
- Am I a candidate for Ruxolitinib, Fedratinib, Pacritinib or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Add these to your appointment list, or take the full question set for this cancer.
Anaemia of myelofibrosis
Momelotinib (MOMENTUM), erythropoiesis-stimulating agents where erythropoietin is low, danazol, transfusion with iron chelation; luspatercept in trials (INDEPENDENCE).
Momelotinib is the JAK inhibitor designed for anaemic myelofibrosis patients: it can improve haemoglobin while shrinking the spleen.
Epoetin alfa is a manufactured version of the kidney hormone that tells the bone marrow to make red blood cells. In cancer it treats anaemia caused by chemotherapy and reduces the need for transfusions, but it is used cautiously because it can shorten survival and cause clots.
Red cell and platelet transfusions, iron and erythropoiesis-stimulating agents keep patients safe through chemotherapy and marrow failure; restrictive thresholds and ESA caution reflect trials showing more is not better.
- Life-saving in acute leukaemia and transplant
- Restrictive strategies proven safe and cheaper
- New MDS agents reduce transfusion burden
An injection that helps the marrow finish making red cells, reducing or removing the need for transfusions in lower-risk MDS and beta-thalassaemia.
- An Efficacy and Safety Study of Luspatercept (ACE-536) Versus Placebo in Subjects With Myeloproliferative Neoplasm-Associated Myelofibrosis on ConcomiPhase 3NCT04717414313 peopleevidence 47Tests LuspaterceptA Phase 3, Double-blind, Randomized Study to Compare the Efficacy and Safety of Luspatercept (ACE-536) Versus Placebo in Subjects With Myeloproliferative Neoplasm-Associated Myelofibrosis on Concomitant JAK Inhibitor Therapy and Who Require Red Blood Cell Transfusions
No headline result recorded yet.
- Study of DISC-0974 (RALLY-MF) in Participants With Myelofibrosis or Myelodysplastic Syndrome and AnemiaPhase 1/2NCT05320198150 peopleevidence 19RALLY-MF: A Phase 1b/2 Open-Label Study to Evaluate the Safety, Tolerability, Pharmacokinetics, Pharmacodynamics, and Clinical Activity of DISC-0974 in Participants With Myelofibrosis or Myelodysplastic Syndrome and Anemia
No headline result recorded yet.
- Blood supply shortages, especially in LMICs
- ESA safety restricts use
- Iron overload and alloimmunisation with chronic transfusion
- Between Momelotinib, Epoetin alfa, Transfusion support and anaemia management and the other options, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- How closely do I match the people in An Efficacy and Safety Study of Luspatercept (ACE-536) Versus Placebo in Subjects With Myeloproliferative Neoplasm-Associated Myelofibrosis on Concomi and Study of DISC-0974 (RALLY-MF) in Participants With Myelofibrosis or Myelodysplastic Syndrome and Anemia, and does that change what the results mean for me?Why: Trial populations are selected; age, fitness, prior treatment and biomarkers all affect how far results carry.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Myeloproliferative Neoplasms), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (anaemia of myelofibrosis), which of the standard options do you recommend and why?Why: Guideline options include: Momelotinib (MOMENTUM), erythropoiesis-stimulating agents where erythropoietin is low, danazol, transfusion with iron chelation; luspatercept in trials (INDEPENDENCE).
- Am I a candidate for Momelotinib, Epoetin alfa, Luspatercept, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of An Efficacy and Safety Study of Luspatercept (ACE-536) Versus Placebo in Subjects With Myeloproliferative Neoplasm-Associated Myelofibrosis on Concomi and Study of DISC-0974 (RALLY-MF) in Participants With Myelofibrosis or Myelodysplastic Syndrome and Anemia apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Add these to your appointment list, or take the full question set for this cancer.
Higher-risk, fit for transplant
Allogeneic stem cell transplant, usually under 70 and at MIPSS70 high or DIPSS intermediate-2 or higher, after JAK inhibitor to reduce spleen size.
Allogeneic stem cell transplantation replaces a patient's blood system with a donor's after conditioning chemotherapy, so donor immune cells hunt down leukaemia left behind. It remains the only cure for adverse-risk acute myeloid leukaemia, high-risk acute lymphoblastic leukaemia and Richter transformation, at the price of graft-versus-host disease.
- Curative for otherwise incurable leukaemia
- Graft-versus-leukaemia is an antigen-agnostic immune therapy
Ruxolitinib was the first JAK inhibitor: it shrinks the spleen and relieves symptoms in myelofibrosis and controls blood counts in polycythaemia vera, without eliminating the disease clone.
No trial record is attached to this row yet. The trials tab lists what is recruiting and the landmark trials for this cancer.
- Treatment-related mortality 10-20%
- Chronic GVHD
- Relapse remains the main cause of failure
- Reduce dose for CrCl below 60 with platelets under 150; dialysis dosing after each session.
- Between Allogeneic stem cell transplantation and Ruxolitinib, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- Does your recommendation follow the current guideline (NCCN Guidelines: Myeloproliferative Neoplasms), and if it departs from it, why?Why: Departures from guidelines are sometimes right for an individual; they should be explained.
- For my situation (higher-risk, fit for transplant), which of the standard options do you recommend and why?Why: Guideline options include: Allogeneic stem cell transplant, usually under 70 and at MIPSS70 high or DIPSS intermediate-2 or higher, after JAK inhibitor to reduce spleen size.
- Am I a candidate for Ruxolitinib, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
Add these to your appointment list, or take the full question set for this cancer.
Ruxolitinib failure and trials
Switch JAK inhibitor; combination trials of ruxolitinib with navitoclax, pelabresib, selinexor or imetelstat; imetelstat versus best available therapy in IMpactMF.
Navitoclax is an experimental small-molecule drug from AbbVie in phase 3 trials for myeloproliferative neoplasms, with its target not yet stated publicly.
Pelabresib is an experimental small-molecule drug from Novartis Pharmaceuticals in phase 3 trials, with its target not yet stated publicly.
Selinexor is a first-in-class pill that traps tumour-suppressor proteins inside the nucleus; approved in myeloma, it failed its endometrial cancer test in 2026.
Imetelstat is a lipid-linked oligonucleotide that binds the RNA template of telomerase, the enzyme cancer cells use to stay immortal, and it is the first telomerase inhibitor approved for any cancer. In lower-risk myelodysplastic syndromes it freed 40% of transfusion-dependent patients from transfusions for at least eight weeks versus 15% on placebo, once growth factors have failed.
- Study of Oral Navitoclax Tablet in Combination With Oral Ruxolitinib Tablet Versus Best Available Therapy to Assess Change in Spleen Volume in Adult Participants With Relapsed/Refractory MyelofibrosisPhase 3NCT04468984330 peopleevidence 43Tests NavitoclaxRandomized, Open-Label, Phase 3 Study Evaluating Efficacy and Safety of Navitoclax in Combination With Ruxolitinib Versus Best Available Therapy in Subjects With Relapsed/Refractory Myelofibrosis (TRANSFORM-2), Incorporating Extension Arm C - Continued Access for Navitoclax to Roll Over Subjects From Studies M10-166, M16-109, M16-191, and M19-753
No headline result recorded yet.
- Study of Selinexor in Combination With Ruxolitinib in MyelofibrosisPhase 3NCT04562389353 peopleevidence 48Tests SelinexorA Phase 1/3 Study to Evaluate Efficacy and Safety of Selinexor, a Selective Inhibitor of Nuclear Export, in Combination With Ruxolitinib in Treatment-naïve Patients With Myelofibrosis
No headline result recorded yet.
- A Study Comparing Imetelstat Versus Best Available Therapy for the Treatment of Intermediate-2 or High-risk Myelofibrosis (MF) Who Have Not Responded to Janus Kinase (JAK)-Inhibitor TreatmentPhase 3NCT04576156327 peopleevidence 48Tests ImetelstatA Randomized Open-Label, Phase 3 Study to Evaluate Imetelstat (GRN163L) Versus Best Available Therapy (BAT) in Patients With Intermediate-2 or High-risk Myelofibrosis (MF) Relapsed / Refractory (R/R) to Janus Kinase (JAK) Inhibitor
No headline result recorded yet.
- Extended Access of Momelotinib for Subjects With Primary Myelofibrosis (PMF) or Post-polycythemia Vera or Post-essential Thrombocythemia Myelofibrosis (Post-PV/ET MF)
No headline result recorded yet.
- Nausea and anorexia are near-universal: prophylactic 5-HT3 antagonist plus olanzapine or dexamethasone.
- Between Navitoclax, Pelabresib, Selinexor and the other options, which do you recommend for me, and what about my case would make you choose differently?Why: Guidelines list several reasonable options; the choice turns on details of your tumour, your health and your priorities.
- What is each option trying to achieve: cure, long control, or relief of symptoms, and over what time?Why: The aim shapes how much side effect and disruption is worth accepting.
- How closely do I match the people in Study of Oral Navitoclax Tablet in Combination With Oral Ruxolitinib Tablet Versus Best Available Therapy to Assess Change in Spleen Volume in Adult Participants With Relapsed/Refractory Myelofibrosis and Study of Selinexor in Combination With Ruxolitinib in Myelofibrosis, and does that change what the results mean for me?Why: Trial populations are selected; age, fitness, prior treatment and biomarkers all affect how far results carry.
- What happens if I delay, or decline this step for now? Is the decision reversible?Why: Some decisions can wait for a second opinion or a trial slot; others cannot. Knowing which is part of the choice.
- For my situation (ruxolitinib failure and trials), which of the standard options do you recommend and why?Why: Guideline options include: Switch JAK inhibitor; combination trials of ruxolitinib with navitoclax, pelabresib, selinexor or imetelstat; imetelstat versus best available therapy in IMpactMF.
- Am I a candidate for Navitoclax, Pelabresib, Selinexor or related drugs, and what side effects should I expect?Why: Knowing the expected toxicities helps you plan work, family, and supportive care.
- How do the results of Study of Oral Navitoclax Tablet in Combination With Oral Ruxolitinib Tablet Versus Best Available Therapy to Assess Change in Spleen Volume in Adult Participants With Relapsed/Refractory Myelofibrosis and Study of Selinexor in Combination With Ruxolitinib in Myelofibrosis apply to someone like me?Why: Trial populations differ from individual patients; ask how closely you match.
Add these to your appointment list, or take the full question set for this cancer.