PF-04449913 For Patients With Acute Myeloid Leukemia at High Risk of Relapse After Donor Stem Cell Transplant

A Phase 2 Study of PF-04449913 for the Treatment of Acute Myeloid Leukemia Patients With High Risk of Post-Allogeneic Stem Cell Transplantation Relapse

This phase II trial will test whether the Hedgehog signaling pathway inhibitor PF-04449913 can decrease disease relapse in high-risk patients with acute myeloid leukemia after donor stem cell transplant.

Study Overview

• Status: Completed
• Conditions: Recurrent Adult Acute Myeloid Leukemia; Adult Acute Myeloid Leukemia in Remission
• Intervention / Treatment: Drug: PF-04449913

Detailed Description

Disease relapse is the most common cause of death after allogeneic stem cell transplantation for acute myeloid leukemia. Patients at high risk for relapse may benefit from a novel, biologically rational therapeutic intervention to prevent this outcome. PF-04449913 is a small molecule inhibitor of the hedgehog (Hh) pathway that inhibits the protein Smoothened (SMO). Aberrant Hh signaling may contribute to the survival and expansion of the leukemia stem cell, and inhibiting the Hh pathway can eliminate these cells. Therefore, targeting Hh may be a logical intervention in the post-transplantation setting for those with high risk of relapse. The investigators propose a phase 2 study of PF-04449913 in patients with acute myeloid leukemia who have received an allogeneic stem cell transplantation and are at high risk of relapse.

This is an open label, phase 2 study employing PF-04449913 in acute myeloid leukemia patients who received an allogeneic stem cell transplantation and are at high risk of relapse. Patients will receive consecutive 28-day cycles of PF-04449913 at 100 mg/day, beginning on post-transplantation day 80 +/- 10 days, after their routine post-transplant bone marrow biopsy. Treatment will continue for up to one year or until they experience toxicity or disease relapse. 50 patients will be required for a 90% power to detect a 20% difference in one-year relapse-free survival.

• Study Type: Interventional
• Enrollment (Actual): 31
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • Colorado
    • Aurora, Colorado, United States, 80045
      • University of Colorado Cancer Center
  • Ohio
    • Columbus, Ohio, United States, 43210
      • Ohio State University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• WHO-confirmed AML
• Age ≥18 years
• Between days 28 and 50 post transplantation at the time of initiation of the study drug
• ECOG performance status ≤ 2 (See Appendix A: ECOG Performance Status Scale)
• Life expectancy > 2 months

• Recipient of a myeloablative or non-myeloablative allogeneic HSCT

  • Conditioning regimen to be prescribed at investigator's discretion, but will be prospectively defined as myeloablative or non-myeloablative
• Stable engraftment, as defined by absolute neutrophil count (ANC) ≥ 1000/mm3 and platelets ≥ 25,000/mm3
• In morphologic remission (< 5% marrow blasts) based on BM biopsy performed +/- 5 days of day 28 post- transplantation
• Without clinical signs of active central nervous system disease
• For non-myeloablative transplants, ≥50% CD3 donor chimerism at screening
• High risk of relapse after HSCT, defined as the presence of minimal residual disease as measured by flow cytometry in the absence of evidence of morphologic disease on a bone marrow biopsy prior to HSCT

• Adequate organ function as indicated by the following laboratory values:

  • Aspartate aminotransferase (AST), alanine aminotransferase, (ALT) ≤ 3.0 x institutional upper limit of normal (ULN)
  • Total bilirubin ≤ 2.0 x institutional ULN, unless documented Gilbert's syndrome
  • Either creatinine <1.5 x institutional upper limit of normal (ULN) or creatinine clearance >60 mL/min as calculated by institution's standard formula
• Serum/urine pregnancy test (for females of childbearing potential) that is negative within 72 hours prior to initiation of first dose of treatment (a patient is of childbearing potential if, in the opinion of the investigator, she is biologically capable of having children and is sexually active)
• Female patients of childbearing potential and sexually active males and female partners of childbearing potential must agree to use a highly effective method of contraception throughout the study and for at least 90 days after the last dose of assigned treatment.
• Subject is able to comply with study procedures and follow-up examinations.

Exclusion Criteria:

• Concomitant treatment with other anti-neoplastic agents, with the exception, when clinically indicated, of prophylaxis in the post-transplantation setting with intrathecal chemotherapy
• Use of any other experimental drug or therapy within 28 days of baseline
• Inability to swallow or absorb drug
• Active uncontrolled acute fungal, bacterial, or other infection that is unresponsive to therapy at time of study drug dosing
• Unstable angina pectoris
• New York Heart Association Class III or IV heart failure
• QTc interval (using Fridericia's correction formula, QTcF, if prolonged) >470 msec
• Active cardiac arrhythmias with rapid ventricular response (defined as heart rate greater than 100 beats/minute)
• Known HIV infection
• Grade III/IV acute GVHD
• Current use or anticipated need for food or drugs that are known moderate/strong CYP3A4 inducers (See Table 1 and section 5.9.2: Prohibited Concomitant Therapy), with the exception of azole antifungals, which are permitted.
• Any medical, psychiatric, addictive or other kind of disorder which compromises the ability of the subject to give written informed consent and/or to comply with procedures.
• Pregnant or lactating females

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: PF-04449913; Beginning 80 days after allogeneic stem cell transplant, patients receive PF-04449913 (100mg) orally once daily on days 1-28. Treatment repeats every 28 days for up to 1 year in the absence of disease progression or unacceptable toxicity.	Drug: PF-04449913; 100mg given orally; Other Names: Hedgehog inhibitor

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Relapse-free Survival in Days	Days after transplant until disease relapse or death as measured by Kaplan-Meier statistical method.	1 year

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Remission Duration	Length of time before remission measured in days	Up to 5 years
Number of Patients With Adverse Events (AE) Related to Glasdegib	Subjects will be evaluated for AEs at each visit with the NCI-CTCAE version 4.03 used as a guide for the grading of severity.	30 days
Overall Survival of All Patients		1 year

Collaborators and Investigators

• Sponsor: University of Colorado, Denver
• Collaborators: The Leukemia and Lymphoma Society
• Investigators: Principal Investigator: Daniel A Pollyea, MD, MS, University of Colorado, Denver

Study record dates

Study Major Dates

• Study Start (Actual): April 29, 2013
• Primary Completion (Actual): May 8, 2019
• Study Completion (Actual): February 4, 2020

Study Registration Dates

• First Submitted: April 23, 2013
• First Submitted That Met QC Criteria: April 23, 2013
• First Posted (Estimate): April 26, 2013

Study Record Updates

• Last Update Posted (Actual): January 25, 2022
• Last Update Submitted That Met QC Criteria: December 30, 2021
• Last Verified: December 1, 2021

More Information

Terms related to this study

• Keywords: Myeloid leukemia in remission; Recurrent myeloid leukemia
• Additional Relevant MeSH Terms: Neoplasms by Histologic Type; Neoplasms; Leukemia; Leukemia, Myeloid; Leukemia, Myeloid, Acute
• Other Study ID Numbers: 12-1558.cc; NCI-2013-00824 (Other Identifier: National Cancer Institute)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO