A Phase 1 interventional study of Talazoparib and pacritinib in Primary Myelofibrosis, Post-polycythemia Vera Myelofibrosis and Post-essential Thrombocythemia Myelofibrosis, sponsored by Fox Chase Cancer Center. Recruiting at 1 site in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2024-05-03.
Sponsored by Fox Chase Cancer Center · Phase 1, Interventional, and Treatment
Among 17 studies testing pacritinib in Primary Myelofibrosis — 5 open to participants now, 7 under way, 1 of them phase 3. pacritinib · Primary Myelofibrosis.
Among the 17 studies testing pacritinib in Primary Myelofibrosis, this one is the 13th largest by planned enrollment, is the only one that started in 2024, is one of 5 in phase 1, and was the 14th registered.
625 studies on the registry are indexed under Primary Myelofibrosis; 124 are open to participants now.
This study's planned enrollment of 24 is below the median of 43 across 489 interventional studies indexed under Primary Myelofibrosis.
Browse Primary Myelofibrosis studies →5 of the 17 studies testing pacritinib in Primary Myelofibrosis are open now, in 2 countries. Each count lists the studies.
pacritinib: first FDA approval 2022 (VONJO). What it is approved for, and how studies give it, is on its page →
Of the 101 Primary Myelofibrosis studies recruiting now, 83 (82%) set no upper age limit and 13 (13%) stop at 75 or younger; 10 take children under 18; 7 take healthy volunteers.
This study: 18 Years and older · all sexes · no healthy volunteers.
The full table on the hub →17 studies; the count open now beside each. This study's row is marked.
First in 2008; this study’s year is marked. 1 started in 2024.
Median enrollment 30 across the 17 interventional studies. Of the 8 that completed or were terminated, 4 (50%) have results posted.
9 of 17 have an industry lead sponsor. The 10 most frequent:
Fox Chase Cancer Center is the lead sponsor of 216 studies on the registry; 29 are open to participants now.
Of its 16 completed or terminated interventional studies of FDA-regulated products, 9 (56%) have results posted.
Fox Chase Cancer Center has 1 study filed under Primary Myelofibrosis — fewer than ten, so there is no comparison to draw.
2 of the studies testing pacritinib in Primary Myelofibrosis that are under way reach primary completion within a year, 0 of them phase 3. Phase 3 first, then by date:
| Study | Primary completion |
|---|---|
| NCT06414681University of Kansas Medical CenterCombination of Tagraxofusp With Pacritinib in Patients With Intermediate-1 or Higher Myelofibrosis, Who Have Had Prior Therapy With the Approved JAK Inhibitors or in Which Therapy With the Approved JAK Inhibitors is Not Appropriate, Contraindicated or Declined | 2026-12 |
| NCT04282187University of WashingtonDecitabine With Ruxolitinib, Fedratinib or Pacritinib for the Treatment of Accelerated/Blast Phase Myeloproliferative Neoplasms | 2027-11-11 |
Among the 17 studies testing pacritinib in Primary Myelofibrosis, from their registry updates:
This is a prospective phase I dose-escalation study, with the primary objective to access the MTD and find the RP2D of talazoparib, given in combination with standard of care dosing of pacritinib.
This is a prospective phase I dose-escalation study, with the primary objective to access the MTD and find the RP2D of talazoparib, given in combination with standard of care dosing of pacritinib. Subjects must have a diagnosis of a myeloproliferative neoplasm and progressed or become intolerant to any JAK2 directed therapy. To be eligible for the therapy, patients are required to consent to a bone marrow biopsy at the beginning of study treatment. The treatment protocol involves initiating pacritinib on day -7 (lead-in phase, starting day -7 for cycle 1) with a standard of care dose of 200mg twice daily (BID). Subsequently, talazoparib will be given on day 1 of the treatment cycle. Cohort 1 will enroll patients at the starting dose of 0.25mg talazoparib for 14 days (dose level 1) and DLT (dose-limiting toxicity) rate will inform the subsequent dose levels (DLs).
Investigators plan to use a Bayesian Optimal Interval Design (BOIN) to determine the maximum tolerated dose (MTD) in patients with Ph-MPNs (Philadelphia chromosome negative myeloproliferative neoplasms) who have either not responded to or cannot tolerate ruxolitinib monotherapy. Subjects who are currently receiving JAK2-directed therapy will undergo a one-day washout period before starting the study treatment, as abrupt discontinuation of JAK2 inhibition can lead to side effects. This brief interval allows for the resolution of any lingering effects before initiating the new treatment. A bone marrow aspirate and or biopsy will be obtained to assess response to therapy at the end of each cycle of treatment (28 days), prior to beginning the next cycle as per physician discretion. Peripheral blood and bone marrow mononuclear cells will be checked for γ-H2AX (histone H2A family X) at set time points as a biomarker assay to assess for DNA damage in the same manner as the pre-clinical models published in our previous studies. Patients may remain on study drug unless they experience an unacceptable toxicity, fail to show a benefit, or they attain remission and it is felt by the investigator that they can proceed to an allogenic stem cell transplant.
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:
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.
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
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.
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
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.
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 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.
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
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.
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.
Histologically or cytologically confirmed
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
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.
Line of therapy
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
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.
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.
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.
Biopsy and archival tissue
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
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.
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.
0.25 mg (PO, QD) Talazoparib (Days 1-7) 200 mg (PO, BID) Pacritinib (Day 1-28, Lead in dosing of Pacritinib day -7 for the first cycle of treatment)
Drug: Talazoparib · Drug: pacritinib
0.25 mg (PO, QD) Talazoparib (Days 1-14) 200 mg (PO, BID) Pacritinib (Day 1-28, Lead in dosing of Pacritinib day -7 for the first cycle of treatment)
Drug: Talazoparib · Drug: pacritinib
0.5 mg (PO, QD) Talazoparib (Days 1-14) 200 mg (PO, BID) Pacritinib (Day 1-28, Lead in dosing of Pacritinib day -7 for the first cycle of treatment)
Drug: Talazoparib · Drug: pacritinib
0.75 mg (PO, QD) Talazoparib (Days 1-14) 200 mg (PO, BID) Pacritinib (Day 1-28, Lead in dosing of Pacritinib day -7 for the first cycle of treatment)
Drug: Talazoparib · Drug: pacritinib
1 mg (PO, QD) Talazoparib (Days 1-14) 200 mg (PO, BID) Pacritinib (Day 1-28, Lead in dosing of Pacritinib day -7 for the first cycle of treatment)
Drug: Talazoparib · Drug: pacritinib
pacritinib in combination with talazoparib
Also known as: talzenna
pacritinib in combination with talazoparib
Also known as: vonjo
Maximum Tolerated Dose (MTD)
To define the maximum tolerated dose (MTD) of talazoparib in combination with standard of care dosing of pacritinib in order to establish a recommended phase II dose (RP2D).
Time frame: 6 years
Rate of grade 3 or higher toxicity
Rate of grade 3 or higher toxicities occurring with the combination of talazoparib and pacritinib in patients with MPNs that have failed to respond to one line of JAK2 directed therapy.
Time frame: 6 years
Response rate
Response rate defined by a 35% or greater spleen volume reduction (SVR) or a \>25% reduction in total symptom score (TSS) at week 24 (per IWG-MTR (International Working Group for Myelofibrosis Research and Treatment) criteria).
Time frame: 6 years
Disease control rate
Disease control rate, defined by improvement in quality of life measures, spleen size, and hematological recovery
Time frame: 6 years
Progression free survival
Progression free survival, defined as the time of enrollment to disease progression
Time frame: 6 years
Overall survival
Overall survival, defined by time from enrollment to death from any cause
Time frame: 6 years
Plan to share: No
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Studies of the drugs tested here: Talazoparib · Pacritinib