A Study of Oral Nuvisertib (TP-3654) in Patients with Myelofibrosis

This study is a Phase 1/2, multicenter, dose-escalation, open-label trial to assess safety, tolerability, pharmacokinetics and pharmacodynamics of nuvisertib (TP-3654) in patients with intermediate or high-risk primary or secondary MF.

Arm 1 will enroll patients who have been previously treated and failed on a JAK inhibitor or ineligible to receive treatment with a JAK inhibitor.

Arm 2 will enroll patients who are on a stable dose of ruxolitinib, but who have either lost response or had a suboptimal or plateau in response.

Arm 3 will enroll patients who have been previously treated on JAK inhibitor (except momelotinib) that was complicated by anemia, thrombocytopenia or hematoma.

Eligibility Criteria:
Patients must meet all of the following inclusion criteria to be eligible:

Nuvisertib (TP-3654) Monotherapy Arm:

* Confirmed pathological diagnosis of primary myelofibrosis (PMF) or post-PV-MF/post-ET- MF and intermediate or high-risk primary or secondary MF
* Previously treated with JAK inhibitor(s) and is intolerant, resistant, refractory or has lost response to the JAK inhibitor(s) or is ineligible to be treated with JAK inhibitor
* Fulfill the following clinical laboratory parameters:
* Platelet count ≥ 25 x 10\^9 /L, without assistance of growth factors or platelet transfusions
* ANC ≥ 1 x 10\^9/L without assistance of granulocyte growth factors
* Peripheral blood blast count \< 5%
* ECOG performance status ≤ 1
* Life expectancy ≥ 6 months
* Adequate renal function
* Adequate hepatic function
* Adequate coagulation function
* Splenomegaly (spleen volume of ≥ 450 cm3 by MRI or CT scan) within 2 weeks prior to Cycle 1 Day 1.
* Dose escalation: At least 2 symptoms measurable (score ≥ 1) using the MF-SAF
* Dose expansion: At least 2 symptoms measurable with each score of ≥ 3 or a total average score of ≥ 10 per MFSAF

Nuvisertib (TP-3654) + Ruxolitinib Arm:

* Confirmed pathological diagnosis of PMF or post-PV-MF/post ET- MF and intermediate or high-risk primary or secondary MF
* On ruxolitinib treatment for ≥ 6 months, and on a stable dose of ruxolitinib (5 to 25 mg BID) for ≥ 8 weeks prior to the first dose of nuvisertib, but has either lost response or had a suboptimal or plateau in response
* Fulfills the following clinical laboratory parameters:
* Platelet count ≥ 50 × 10\^9/L (without assistance of growth factors or platelet transfusions)
* ANC ≥ 1 × 109/L without assistance of granulocyte growth factors
* Peripheral blood blast count \< 5% at screening
* Adequate renal function
* Adequate hepatic function
* Adequate coagulation function
* Splenomegaly (spleen volume of ≥ 450 cm3 by MRI/CT scan) within 2 weeks prior to Cycle 1 Day 1
* At least 2 symptoms measurable with each score ≥ 3 or a total average score of ≥ 10 per MFSAF v4.0
* ECOG performance status ≤ 1
* Life expectancy ≥ 6 months

Nuvisertib (TP-3654) + Momelotinib Arm

* Confirmed pathological diagnosis of PMF or post-PV-MF/post ET-MF and intermediate or high-risk primary or secondary MF
* Previously treated with an approved JAK inhibitor (except momelotinib) for PMF or Post-PV/ET MF for ≥ 12 weeks, or ≥ 4 weeks if JAK inhibitor therapy was complicated by a transfusion requirement of ≥ 4 units of red blood cells in 8 weeks, or Grade 3/4 AEs of thrombocytopenia, anemia, or hematoma
* Fulfills the following clinical laboratory parameters:
* Anemic, defined as Hb \<10 g/dL or requiring RBC transfusion at baseline
* Platelet count ≥ 50 × 109/L (without assistance of growth factors or platelet transfusions)
* ANC ≥ 1 × 109/L without assistance of granulocyte growth factors
* Peripheral blood blast count \< 5% at screening
* Adequate renal function
* Adequate hepatic function
* Adequate coagulation function
* Splenomegaly (spleen volume of ≥ 450 cm3 by MRI/CT scan) within 2 weeks prior to Cycle 1 Day 1
* At least 2 symptoms measurable with each score of ≥ 3 or a total average score of ≥ 10 per MFSAF v4.0
* ECOG performance status ≤ 1
* Life expectancy ≥ 6 months

Patients meeting any one of these exclusion criteria will be prohibited from participating in this study:

Nuvisertib (TP-3654) Monotherapy Arm:

* Received previous systemic antineoplastic therapy or any experimental therapy within 2 weeks or 5 half-lives, whichever is longer, prior to Cycle 1 Day 1. Hydroxyurea or anagrelide are allowed up to 24 hours prior to Cycle 1 Day 1).
* Major surgery within 4 weeks prior to Cycle 1 Day 1 and/or not recovered adequately from from surgery prior to first dose.
* Splenic irradiation within 6 months prior to Screening or prior splenectomy.
* Prior allogeneic stem cell transplant within the last 6 months.
* Eligible for allogeneic bone marrow or stem cell transplantation.
* Unresolved Grade ≥ 2 non-hematological toxicity related to prior treatment
* History of symptomatic congestive heart failure, or myocardial infarction, or uncontrolled arrhythmia within 6 months prior to Cycle 1 Day 1; left ventricular ejection fraction (LVEF) \< 45% by echocardiogram within 4 weeks prior to Cycle 1 Day 1.
* Corrected QT interval \> 480msec.
* Prior or concurrent malignancy that could interfere with the investigational regime.
* Known history of chronic liver disease, e.g. portal hypertension or any of its complications, cirrhosis, Child-Pugh C, auto-immune hepatitis, alpha-1 anti-trypsin deficiency, Wilson's disease, etc.
* Active, uncontrolled bacterial, viral, or fungal infections, requiring systemic antimicrobial within 1 week prior to Cycle 1 Day 1.
* Chronic active or acute viral hepatitis A, B, or C infection (testing for hepatitis B and C are required)
* Exhibited allergic reactions or sensitivity to nuvisertib, or similar compound.
* Medical condition or GI tract surgery that could impair absorption or result in short bowel syndrome with diarrhea.
* Systemic steroid therapy (\>10 mg daily prednisone or equivalent) within 1 week prior to the first dose of study treatment (note: topical, inhaled, nasal, and ophthalmic steroids are not prohibited).
* Known clinically significant anemia due to iron, vitamin B12, or folate deficiencies, or autoimmune or hereditary hemolytic anemia, or thalassemia, or severe GI bleeding.
* Pregnant or breastfeeding
* Currently receiving any other investigational agent.

Nuvisertib (TP-3654) + Ruxolitinib Arm:

* Received previous systemic antineoplastic therapy (other than ruxolitinib) or any other experimental therapy within 2 weeks or 5 half-lives, whichever is longer, prior to Cycle 1 Day 1 (Note: Prior treatment with nuvisertib is not allowed. Hydroxyurea or anagrelide are allowed up to 24 hours prior to Cycle 1 Day 1).
* Received systemic steroid therapy (\>10 mg daily prednisone or equivalent) within 1 week prior to Cycle 1 Day 1 (Note: Topical, inhaled, nasal, and ophthalmic steroids are not prohibited)
* Known allergic reactions or sensitivity to nuvisertib, or similar compound.
* Splenic irradiation within 6 months prior to Screening or prior splenectomy
* Prior allogeneic stem cell transplant within the last 6 months (Note: Patients who have relapsed after 6 months post-transplant and do not have active GVHD are eligible).
* Eligible for allogeneic bone marrow or stem cell transplantation (Note: Patients who are not willing to undergo transplantation or for whom a suitable donor is not available are considered as transplant ineligible.)
* Major surgery within 4 weeks prior to Cycle 1 Day 1 and/or have not recovered adequately prior to first dose.
* Active, uncontrolled bacterial, viral, or fungal infections, requiring parenteral antimicrobial within 1 week prior to Cycle 1 Day 1
* Chronic active or acute viral hepatitis A, B, or C infection (testing for hepatitis B and C are required)
* Known history of chronic liver disease (eg, portal hypertension or any of its complications, cirrhosis, Child-Pugh C, auto-immune hepatitis, alpha-1 anti-trypsin deficiency, Wilson's disease, etc) (Note: Abnormal liver morphology at baseline imaging may require additional testing, as needed).
* Unresolved Grade ≥ 2 non-hematological adverse events related to prior treatment (stable Grade 2 conditions may be permitted in consultation with the Sponsor)
* History of myocardial infarction or symptomatic congestive heart failure or uncontrolled arrhythmia within 6 months prior to Cycle 1 Day 1; LVEF \<45% by echocardiogram within 4 weeks prior to Cycle 1 Day 1
* Corrected QTcF of \> 480 msec
* Prior or concurrent malignancy that could interfere with the safety or efficacy assessment of the study intervention
* History of a medical condition or GI tract surgery that could impair absorption or could result in short bowel syndrome with diarrhea
* Known clinically significant anemia due to iron, vitamin B12, or folate deficiencies, or autoimmune or hereditary hemolytic anemia, or thalassemia, or severe GI bleeding
* Pregnant or breastfeeding

Nuvisertib (TP-3654) + Momelotinib Arm:

* Received previous systemic antineoplastic therapy or any experimental therapy within 2 weeks or 5 half-lives, whichever is longer, prior to Cycle 1 Day 1 (Notes: Prior treatment with momelotinib or nuvisertib is not allowed; in patients with ongoing JAK inhibitor therapy, ie, ruxolitinib, at screening, JAK inhibitor therapy must be tapered over a period of at least 1 week. Patients on a low dose of ruxolitinib (eg, 5 mg QD) may have a reduced taper period or no taper; hydroxyurea or anagrelide are allowed up to 24 hours prior to Cycle 1 Day 1).
* Received systemic steroid therapy (\>10 mg daily prednisone or equivalent) within 1 week prior to Cycle 1 Day 1 (Note: Topical, inhaled, nasal, and ophthalmic steroids are not prohibited).
* Known allergic reactions or sensitivity to nuvisertib, momelotinib, or any structurally similar drug, or to any component of the formulations of either study intervention
* Splenic irradiation within 6 months prior to screening or prior splenectomy
* Prior allogenic stem cell transplant within the last 6 months (Note: Patients who have relapsed after 6 months post-transplant and do not have active GVHD are eligible).
* Eligible for allogeneic bone marrow or stem cell transplantation (Note: Patients who are not willing to undergo transplantation or for whom a suitable donor is not available are considered as transplant ineligible).
* Major surgery within 4 weeks prior to Cycle 1 Day 1 and/or have not recovered adequately from surgery prior to first dose.
* Active, uncontrolled bacterial, viral, or fungal infections, requiring parenteral antimicrobial within 1 week prior to Cycle 1 Day 1
* Chronic active or acute viral hepatitis A, B, or C infection (testing for hepatitis B and C are required)
* Known history of chronic liver disease (eg, portal hypertension or any of its complications, cirrhosis, Child-Pugh C, auto-immune hepatitis, alpha-1 anti-trypsin deficiency, Wilson's disease, etc) (Note: Abnormal liver morphology at baseline imaging may require additional testing, as needed)
* Unresolved Grade ≥ 2 non-hematological adverse events related to prior treatment (stable Grade 2 conditions may be permitted in consultation with the Sponsor)
* Presence of Grade ≥ 2 peripheral neuropathy
* History of myocardial infarction or symptomatic congestive heart failure or uncontrolled arrhythmia within 6 months prior to Cycle 1 Day 1; LVEF \< 45% by echocardiogram within 4 weeks prior to Cycle 1 Day 1
* Corrected QTcF of \> 480 msec
* Prior or concurrent malignancy that could interfere with the safety or efficacy assessment of the study intervention
* History of a medical condition or GI tract surgery that could impair absorption or could result in short bowel syndrome with diarrhea
* Known clinically significant anemia due to iron, vitamin B12, or folate deficiencies, or autoimmune or hereditary hemolytic anemia, or thalassemia, or severe GI bleeding
* Pregnant or breastfeeding