A Phase 3 interventional study of Placebo and Elritercept in Myelofibrosis and Anemia, sponsored by Takeda. Recruiting at 214 sites in 31 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-11-06.
Sponsored by Takeda · Phase 3, Interventional, and Treatment
The main aim of this study is to find out how well elritercept works to improve anemia in participants with myelofibrosis (MF) who are taking ruxolitinib when compared to placebo.
Other aims are to learn how elritercept improves anemia compared to placebo; to learn if elritercept reduces tiredness, improves symptoms related to MF, and helps participants do physical activities more easily. The study also aims to find out how elritercept affects the bone marrow, the spleen, and whether participants develop antibodies to the study drug.
The study will also check how safe elritercept is compared to placebo, and if elritercept stays safe over a long period of time. Participants will receive study treatment for at least 9 months (36 weeks). After this period, participants who received placebo will have the option to switch to elritercept.
625 studies on the registry are indexed under Primary Myelofibrosis; 124 are open to participants now.
This study's planned enrollment of 324 is above the median of 43 across 489 interventional studies indexed under Primary Myelofibrosis.
Browse Primary Myelofibrosis studies →Takeda is the lead sponsor of 1,026 studies on the registry; 89 are open to participants now.
Of its 178 completed or terminated interventional studies of FDA-regulated products, 154 (87%) have results posted.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Systemic treatment within 28 days before randomization with any of the following:
Clinically significant cardiovascular disease, defined as:
Prior history of , other than MF. Participants who are free of other malignant disease for ≥2 years and have completed treatment, including maintenance, are allowed. Participants with a history or concurrent diagnosis of the following conditions are allowed if not requiring systemic therapy:
Any of the following local laboratory abnormalities:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
A “mini-stroke”: temporary stroke-like symptoms caused by reduced blood flow to part of the brain, spinal cord or eye, without signs of a new stroke on a scan.
Stroke symptoms need emergency care at once, even if they go away.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECOG performance status
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Life expectancy
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
NYHA class (heart failure)
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
QT and QTc
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
TIA (transient ischaemic attack)
A “mini-stroke”: temporary stroke-like symptoms caused by reduced blood flow to part of the brain, spinal cord or eye, without signs of a new stroke on a scan.
Stroke symptoms need emergency care at once, even if they go away.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Excipients
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Absolute neutrophil count (ANC)
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bilirubin
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants will receive elritercept at a starting dose of 3.75 milligrams per kilogram (mg/kg) subcutaneously (SC) once every 4 weeks (Q4W) on Day 1 of each 28-day cycle for approximately 36 weeks during the double-blinded treatment period, with possible up-titration to 5.0 mg/kg from Cycle 3 Day 1 based on response and safety/tolerability. Participants may continue to receive elritercept during the extended open-label treatment period.
Drug: Elritercept
Participants will receive elritercept-matching placebo with equivalent volume to elritercept SC Q4W on Day 1 of each 28-day cycle for approximately 36 weeks during the double-blinded treatment period. Eligible participants may initiate elritercept at a starting dose of 3.75 mg/kg SC Q4W on Day 1 of each 28-day cycle during the extended open-label treatment period, with possible up-titration to 5.0 mg/kg after 2 cycles, based on response and safety/tolerability.
Drug: Placebo · Drug: Elritercept
Elritercept-matching placebo
Elritercept, SC, injection
Also known as: TAK-226
Proportion of Participants Who Are Red Blood Cell-Transfusion Independent (RBC-TI) for Any Consecutive Greater Than or Equal to (≥) 12-Week Period During the 36-Week Double-Blinded Treatment Period
RBC-TI is defined as no RBC transfusions administered for the specified time period during study treatment.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants Who Achieve ≥50 Percent (%) Reduction in RBC Transfusion Burden From Baseline Over Any Consecutive 12-Week Period
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants Who Are RBC-TI for Any Consecutive ≥16-Week Period
RBC-TI is defined as no RBC transfusions administered for the specified time period during study treatment.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants Who Are RBC-TI for Any Consecutive ≥12-Week Period With Concurrent Mean Hemoglobin (Hgb) Increase ≥1.5 Grams per Deciliter (g/dL) From Baseline
RBC-TI is defined as no RBC transfusions administered for the specified time period during study treatment.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants Who Are RBC-TI for Any Consecutive ≥24-Week Period
RBC-TI is defined as no RBC transfusions administered for the specified time period during study treatment.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants Who Are RBC-TI for Any Consecutive ≥12-Week Period With Concurrent Mean Hgb Increase of ≥1.0 g/dL and ≥2.0 g/dL From Baseline
RBC-TI is defined as no RBC transfusions administered for the specified time period during study treatment.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants Who Are RBC-TI for Any Consecutive 16- or 24-Week Period With a Concurrent Mean Hgb Increase of ≥1.0 g/dL, ≥1.5 g/dL, and ≥2.0 g/dL From Baseline
RBC-TI is defined as no RBC transfusions administered for the specified time period during study treatment.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Maximum Duration of RBC-TI for Participants Who Achieved RBC-TI for a Consecutive ≥12 Weeks
RBC-TI is defined as no RBC transfusions administered for the specified time period during study treatment.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Maximum Duration of RBC-TI With Concurrent Mean Hgb Increase of ≥1.5 g/dL for Participants Who Achieved Consecutive ≥12 Weeks RBC-TI With Concurrent Mean Hgb Increase of ≥1.5 g/dL
RBC-TI is defined as no RBC transfusions administered for the specified time period during study treatment.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Time to Onset of Anemia Response
Time to onset of anemia response is defined as the duration between the date of randomization and the date participant first achieved anemia response status. Anemia response is evaluated as: achievement of RBC-TI for any consecutive ≥12-week, ≥16-week, or ≥24-week period or ≥50% reduction in red blood cell transfusion burden from baseline over any consecutive 12 weeks.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Mean Change From Baseline in Patient-Reported Outcomes Measurement Information System (PROMIS) Short Form v1.0 - Fatigue 7a T-Score at Week 36
PROMIS Short Form v1.0 - Fatigue 7a is a 7-item, patient-reported measure designed to assess fatigue symptoms and impact over the past 7 days. Response options are on a 5-point scale from never (1) to always (5). Raw scores are computed by summing responses to all 7 items and then converted to a standardized T-score on a scale from 0 to 100 with a mean of 50 and SD of 10 with higher scores representing worse fatigue. T-scores can be produced using a conversion table available from the instrument developer or using response pattern scoring performed by the Health Measures Scoring Service.
Time frame: Baseline, Week 36
Mean Change From Baseline in European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 (EORTC QLQ-C30) Fatigue Scale Score at Week 36
EORTC QLQ-C30 is a 30-item, participant-reported multidomain questionnaire designed to assess functioning, wellbeing, and symptom experience of participants with cancer. The questionnaire's items are divided among 5 multi-item scales measuring functioning (physical, role, emotional, cognitive, and social), 3 multi-item scales measuring symptoms (fatigue, nausea/vomiting, and pain), 6 items measuring symptoms (dyspnea, insomnia, appetite loss, constipation, and diarrhea) as well as financial difficulties, and a 2-item scale measuring global health status (GHS))/quality of life (QoL). Items included in GHS/QoL scale use a 7-point response metric ranging from very poor to excellent, while other items use a 4-point response metric with categories including not at all, a little, quite a bit, and very much. Scale scores are transformed to range from 0 to 100 with higher scores indicating better functioning, GHS/QoL, or worse symptomatology.
Time frame: Baseline, Week 36
Proportion of Participants With Meaningful Improvement and Meaningful Deterioration in PROMIS Short Form v1.0 - Fatigue 7a T-score
PROMIS Short Form v1.0 - Fatigue 7a is a 7-item, patient-reported measure designed to assess fatigue symptoms and impact over the past 7 days. Response options are on a 5-point scale from never (1) to always (5). Raw scores are computed by summing responses to all 7 items and then converted to a standardized T-score on a scale from 0 to 100 with a mean of 50 and SD of 10 with higher scores representing worse fatigue. T-scores can be produced using a conversion table available from the instrument developer or using response pattern scoring performed by the Health Measures Scoring Service. Score cutoffs to define meaningful improvement and meaningful deterioration will be determined prior to the primary analysis based on analysis of blinded trial data in accordance with a prespecified psychometric analysis plan.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Time to Meaningful Improvement and Meaningful Deterioration in PROMIS Short Form v1.0 - Fatigue 7a T-Score From Baseline
PROMIS Short Form v1.0 - Fatigue 7a is a 7-item, patient-reported measure designed to assess fatigue symptoms and impact over the past 7 days. Response options are on a 5-point scale from never (1) to always (5). Raw scores are computed by summing responses to all 7 items and then converted to a standardized T-score on a scale from 0 to 100 with a mean of 50 and SD of 10 with higher scores representing worse fatigue. T-scores can be produced using a conversion table available from the instrument developer or using response pattern scoring performed by the Health Measures Scoring Service. Score cutoffs to define meaningful improvement and meaningful deterioration will be determined prior to the primary analysis based on analysis of blinded trial data in accordance with a prespecified psychometric analysis plan.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants With Meaningful Improvement and Meaningful Deterioration in EORTC QLQ-C30 Fatigue Scale Score
EORTC QLQ-C30 is a 30-item, participant-reported multidomain questionnaire designed to assess functioning, wellbeing, and symptom experience of participant with cancer. The items are divided among 5 multi-item scales measuring functioning (physical, role, emotional, cognitive, and social), 3 multi-item scales measuring symptoms (fatigue, nausea/vomiting, pain), 6 items measuring symptoms (dyspnea, insomnia, appetite loss, constipation, diarrhea) as well as financial difficulties, and a 2-item scale measuring GHS and QoL. Items included in GHS/QoL scale use a 7-point response metric ranging from very poor to excellent, while other items use a 4-point response metric, categories including not at all, a little, quite a bit, and very much. Scale scores are transformed to range from 0 to 100 with higher scores indicating better functioning, better GHS/QoL, or worse symptomatology. Score cutoffs to define meaningful improvement/deterioration to be determined before primary analysis.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Time to Meaningful Improvement and Meaningful Deterioration in EORTC QLQ-C30 Fatigue Scale Score From Baseline
EORTC QLQ-C30 is a 30-item, participant-reported multidomain questionnaire designed to assess functioning, wellbeing, and symptom experience of participant with cancer. The items are divided among 5 multi-item scales measuring functioning (physical, role, emotional, cognitive, social), 3 multi-item scales measuring symptoms (fatigue, nausea/vomiting, pain), 6 items measuring symptoms (dyspnea, insomnia, appetite loss, constipation, diarrhea) as well as financial difficulties, and a 2-item scale measuring GHS and QoL. Items included in GHS/QoL scale use a 7-point response metric ranging from very poor to excellent, while other items use a 4-point response metric, categories including not at all, a little, quite a bit, and very much. Scale scores are transformed to range from 0 to 100 with higher scores indicating better functioning, better GHS/QoL, or worse symptomatology. Score cutoffs to define meaningful improvement/deterioration to be determined before primary analysis.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Mean Changes From Baseline in Myelofibrosis Symptom Assessment Form (MFSAF) v4.0 7-Item Total Symptom Score at Week 36
MFSAF v4.0 is a unidimensional measure assessing 7 core MF symptoms: fatigue, night sweats, itching, abdominal discomfort, pain under ribs, early satiety, and bone pain. The questionnaire asks participants to rate each symptom at its worst during the past 7 days on a 0 to 10 numeric rating scale ranging from absent (0) to worst imaginable (10). The Total Symptom Score (TSS) is calculated as the average of the 7 individual item responses multiplied by 7, yielding a score range of 0 to 70 with higher scores representing worse symptom severity.
Time frame: Baseline, Week 36
Proportion of Participants Achieving Confirmed 50% Reduction in MFSAF v4.0 Total Symptom Score (TSS50)
MFSAF v4.0 is a unidimensional measure assessing 7 core MF symptoms: fatigue, night sweats, itching, abdominal discomfort, pain under ribs, early satiety, and bone pain. The questionnaire asks participants to rate each symptom at its worst during the past 7 days on a 0 to 10 numeric rating scale ranging from absent (0) to worst imaginable (10). The TSS is calculated as the average of the 7 individual item responses multiplied by 7, yielding a score range of 0 to 70 with higher scores representing worse symptom severity.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Time to Symptom Response in MFSAF TSS50 From Baseline
MFSAF v4.0 is a unidimensional measure assessing 7 core MF symptoms: fatigue, night sweats, itching, abdominal discomfort, pain under ribs, early satiety, and bone pain. The questionnaire asks participants to rate each symptom at its worst during the past 7 days on a 0 to 10 numeric rating scale ranging from absent (0) to worst imaginable (10). The TSS is calculated as the average of the 7 individual item responses multiplied by 7, yielding a score range of 0 to 70 with higher scores representing worse symptom severity.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Mean Change From Baseline EORTC QLQ-C30 Physical Functioning Scale Score at Week 36
EORTC QLQ-C30 is a 30-item, participant-reported multidomain questionnaire designed to assess functioning, wellbeing, and symptom experience of participant with cancer. The questionnaire's items include 5 multi-item scales measuring functioning (physical, role, emotional, cognitive, and social). These items use a 4-point response metric with categories including not at all, a little, quite a bit, and very much. Scale scores are transformed to range from 0 to 100 with higher scores indicating better functioning.
Time frame: Baseline, Week 36
Proportion of Participants With Meaningful Improvement and Meaningful Deterioration in EORTC QLQ-C30 Physical Functioning Scale Score
EORTC QLQ-C30 is a 30-item, participant-reported multidomain questionnaire designed to assess functioning, wellbeing, and symptom experience of participant with cancer. The questionnaire's items include 5 multi-item scales measuring functioning (physical, role, emotional, cognitive, and social). These items use a 4-point response metric with categories including not at all, a little, quite a bit, and very much. Scale scores are transformed to range from 0 to 100 with higher scores indicating better functioning. Score cutoffs to define meaningful improvement and meaningful deterioration will be determined prior to the primary analysis based on analysis of blinded trial data in accordance with a prespecified psychometric analysis plan.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Time to Meaningful Improvement and Meaningful Deterioration in EORTC QLQ-C30 Physical Functioning Scale Score From Baseline
EORTC QLQ-C30 is a 30-item, participant-reported multidomain questionnaire designed to assess functioning, wellbeing, and symptom experience of participant with cancer. The questionnaire's items include 5 multi-item scales measuring functioning (physical, role, emotional, cognitive, and social). These items use a 4-point response metric with categories including not at all, a little, quite a bit, and very much. Scale scores are transformed to range from 0 to 100 with higher scores indicating better functioning. Score cutoffs to define meaningful improvement and meaningful deterioration will be determined prior to the primary analysis based on analysis of blinded trial data in accordance with a prespecified psychometric analysis plan.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants With Platelet Response During the 36-Week Double-Blinded Treatment Period
Platelet response includes a mean increase of ≥30×10\^9/ liter (L) from baseline, a \>50% increase from baseline with a count ≥50×10\^9/L, and conversion from \<100 to ≥100×10\^9/L, each sustained for ≥12 weeks.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants Achieving Spleen Volume Reduction (SVR) From Baseline as Measured by Computed Tomography/Magnetic Resonance Imaging (CT/MRI) During the 36-Week Double-Blinded Treatment Period
Proportion of participants achieving SVR of ≥10%, ≥25%, or ≥35% will be presented for this outcome measure.
Time frame: From Cycle 1 Day 1 through Week 36 (each cycle is 28 days)
Proportion of Participants Who Develop Accelerated Phase (AP) MF
Time frame: Up to approximately 7 years
Time to Progression in Participants Who Develop AP MF
Time frame: Up to approximately 7 years
Proportion of Participants Who Develop Blast Phase (BP) MF
Time frame: Up to approximately 7 years
Time to Progression in Participants Who Develop BP MF
Time frame: Up to approximately 7 years
Plasma Concentration-Time Data for Participants Treated With Elritercept
Time frame: At multiple time points from Cycle 1 Day 1 (each cycle is 28 days) up to approximately 7 years
Proportion of Participants Treated With Elritercept who Have Antidrug Antibodies
Time frame: At multiple time points from Cycle 1 Day 1 (each cycle is 28 days) up to approximately 7 years
Overall Survival (OS)
OS is defined as the time from randomization to the date of death due to any cause.
Time frame: From randomization to 7 years
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Plan to share: Yes — Takeda provides access to the de-identified individual participant data (IPD) for eligible studies to aid qualified researchers in addressing legitimate scientific objectives (Takeda's data sharing commitment is available on https://clinicaltrials.takeda.com/takedas-commitment?commitment=5). These IPDs will be provided in a secure research environment following approval of a data sharing request, and under the terms of a data sharing agreement.
Supporting information: Study protocol, Statistical analysis plan, Informed consent form, Clinical study report
Access criteria: IPD from eligible studies will be shared with qualified researchers according to the criteria and process described on https://vivli.org/ourmember/takeda/. For approved requests, the researchers will be provided access to anonymized data (to respect patient privacy in line with applicable laws and regulations) and with information necessary to address the research objectives under the terms of a data sharing agreement.
Data sharing details ↗ · vivli.org
Started Sep 2026 (actual). Primary completion is estimated for Dec 2029, 38 months after the start.
Of 22 phase 3 interventional studies under Primary Myelofibrosis, half reached primary completion within 39 months of starting (the median), counting those still running; a quarter within 30 and three quarters within 68. This study's planned 38 months is close to that.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
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Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Studies of the drug tested here: Elritercept