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PF-06821497 Treatment Of Relapsed/Refractory SCLC, Castration Resistant Prostate Cancer, and Follicular Lymphoma

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT03460977
Recruitment Status : Recruiting
First Posted : March 9, 2018
Last Update Posted : May 23, 2023
Sponsor:
Information provided by (Responsible Party):
Pfizer

Study Description
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Brief Summary:
A Phase 1 Dose Escalation and Expanded Cohort Study Of PF-06821497 In The Treatment Of Adult Patients With Relapsed/Refractory Small Cell Lung Cancer (SCLC), Castration Resistant Prostate Cancer (CRPC) And Follicular Lymphoma (FL).

Condition or disease Intervention/treatment Phase
Castration Resistant Prostate Cancer (CRPC) Small Cell Lung Cancer (SCLC) Follicular Lymphoma (FL) Drug: PF-06821497 Phase 1

Detailed Description:
This is an open label, multi center, Phase 1 dose escalation and dose expansion study of PF-06821497 administered orally BID as a single agent or in combination with SOC to patients with CRPC, SCLC, and FL. Part 1A will evaluate safety and target modulation of PF-06821497 monotherapy in patients with SCLC, FL and CRPC. PF-06821497 will be administered as monotherapy in patients with FL in Part 1B dose escalation and to patients with CRPC in Part 1C dose escalation. For Part 2A (dose escalation combination therapy), PF-06821497 will be administered in combination with SOC in patients with CRPC and SCLC. For Part 2B (dose expansion), patients with mCRPC will be randomized (1:1 ratio) to receive either SOC or PF-06821497 in combination with SOC. Once safety and adequate target modulation has been established in Part 1A, Parts 1B and 2A of the trial will be initiated. Part 1C (monotherapy dose escalation) will determine the MTD of single agent PF-06821497 in patients with mCRPC. Japan and China monotherapy cohorts will evaluate the safety, antitumor activity and PK of single agent PF-06821497 in Japanese and Chinese patients. Part 2A (escalation RP2D finding for combination) will determine the MTD of the combination with SOC in patients with CRPC. Part 2B (dose expansion) will assess the efficacy of PF-06821497 at the RP2D in combination with SOC in patients with mCRPC in comparison to SOC alone. The study is currently enrolling Part 2B.
Study Design
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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 267 participants
Allocation: Non-Randomized
Intervention Model: Sequential Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A PHASE I DOSE ESCALATION AND EXPANDED COHORT STUDY OF PF-06821497 IN THE TREATMENT OF ADULT PATIENTS WITH RELAPSED/REFRACTORY SMALL CELL LUNG CANCER (SCLC), CASTRATION RESISTANT PROSTATE CANCER (CRPC) AND FOLLICULAR LYMPHOMA (FL)
Actual Study Start Date : April 17, 2018
Estimated Primary Completion Date : November 23, 2025
Estimated Study Completion Date : November 23, 2025

Resource links provided by the National Library of Medicine


Arms and Interventions
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Arm Intervention/treatment
Experimental: Dose Escalation (Part 1A)
Participants with SCLC, CRPC and FL will receive PF-06821497 at escalating dose levels
 Drug: PF-06821497
Oral continuous
Other Name: EZH2i
Experimental: Dose Escalation (Part 1B)
Participants with FL will receive PF-06821497 at escalating dose levels
 Drug: PF-06821497
Oral continuous
Other Name: EZH2i
Experimental: Dose Escalation (Part 1C)
Participants with CRPC will receive PF-06821497 at escalating dose levels.
 Drug: PF-06821497
Oral continuous
Other Name: EZH2i
Experimental: Dose Escalation (Part 2A)
Participants with CRPC and SCLC will receive PF-06821497 at escalating dose levels in combination with SOC.
 Drug: PF-06821497
Oral continuous
Other Name: EZH2i
Experimental: Dose Expansion (Part 2B)
Participants with CRPC will receive PF-06821497 in combination with SOC or SOC alone.
 Drug: PF-06821497
Oral continuous
Other Name: EZH2i
Experimental: Japan Cohort
Participants with CRPC will receive PF-06821497 at one or two doses
 Drug: PF-06821497
Oral continuous
Other Name: EZH2i
Experimental: China cohort
Participants will receive PF-06821497 at one or two doses
 Drug: PF-06821497
Oral continuous
Other Name: EZH2i


Outcome Measures
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Primary Outcome Measures :
  1. Percentage of patients with dose limiting toxicities (DLTs) to determine the maximum tolerated dose (MTD) [ Time Frame: Baseline up to 90 days ]
    First cycle DLTs will be utilized to determine the MTD

  2. Overall safety profile including adverse events [ Time Frame: Baseline up to approximately 2 years ]
    Adverse Events will be graded by National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE version [4.03])

  3. Preliminary efficacy determination as evaluated by disease specific response criteria [ Time Frame: Through study completion, approximately 2 years past last patient first visit. ]
    Objective response using Response Evaluation Criteria in Lymphoma (RECIL) for lymphoma, Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 for solid tumors including Small Cell Lung Cancer (SCLC) and Prostate Cancer Working Group 3 (PCWG3) for Castration Resistant Prostate Cancer (CRPC). Progression-free survival in Part 2B in patients with CRPC.

  4. Overall safety profile including laboratory abnormalities [ Time Frame: Baseline up to approximately 2 years ]
    Laboratory abnormalities as characterized by type, frequency, severity (as graded by NCI CTCAE version [4.03]), and timing.

  5. Overall safety profile including vital signs [ Time Frame: Baseline up to approximately 2 years ]
    Vital sign changes from baseline including blood pressure, heart rate, ECG changes.


Secondary Outcome Measures :
  1. Evaluate time to event anti-tumor activity of PF-06821497 including progression-free survival (PFS), PSA50, Duration of Response (DoR), Time to first skeletal related event and Time to symptomatic skeletal related event, depending on tumor type. [ Time Frame: Baseline and every 21 days through time of confirmed disease progression, unacceptable toxicity, or through study completion, approximately 2 years. ]
    Time to event endpoints based on Response Evaluation Criteria in Lymphoma (RECIL) for lymphoma, Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 for solid tumors including Small Cell Lung Cancer (SCLC) and Prostate Cancer Working Group 3 (PCWG3) for Castration Resistant Prostate Cancer (CRPC)

  2. Evaluate overall survival [ Time Frame: Baseline up to approximately 2 years ]
    Median time to death proportion of patients alive at 6 months, 1 year, and 2 years.

  3. Pharmacokinetic Parameters: Maximum Observed Plasma Concentration (Cmax) [ Time Frame: At specific timepoints from Cycle 1 day 1 to End of Treatment visit ]
    Single dose and multiple dose PK will be calculated as data permits

  4. Pharmacokinetic Parameters: Time to Reach Maximum Observed Plasma Concentration (Tmax) [ Time Frame: At specific timepoints from Cycle 1 day 1 to End of Treatment visit ]
    Single dose and multiple dose PK will be calculated as data permits

  5. Pharmacokinetic Parameters: Area Under the Curve (AUC) [ Time Frame: At specific timepoints from Cycle 1 day 1 to End of Treatment visit ]
    Single dose and multiple dose PK will be calculated as data permits

  6. Pharmacokinetic Parameters: Apparent Oral Clearance (CL/F) [ Time Frame: At specific timepoints from Cycle 1 day 1 to End of Treatment visit ]
    Single dose and multiple dose PK will be calculated as data permits

  7. Pharmacokinetic Parameters: Apparent Volume of Distribution (Vz/F) [ Time Frame: At specific timepoints from Cycle 1 day 1 to End of Treatment visit ]
    Single dose and multiple dose PK will be calculated as data permits

  8. Pharmacokinetic Parameters: Plasma Decay Half-Life (t1/2) [ Time Frame: At specific timepoints from Cycle 1 day 1 to End of Treatment visit ]
    Singe dose and multiple dose PK will be calculated as data permits

  9. Evaluate the impact of PF-06821497 on patient reported outcomes. [ Time Frame: At specific time-points from Cycle 1 Day 1 to End of Treatment visit. ]
    Quality of Life and Time to Functional Status Deterioration as assessed by FACT-P.


Eligibility Criteria
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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Key Inclusion Criteria:

Histological or cytological diagnosis of advanced / metastatic solid tumor with the following tumor types in individual study parts:

Part 1A (closed to enrollment):

Part 1B (closed to enrollment):

Part 1C:

  • Castration resistant prostate cancer. Patients should have received either abiraterone and/or enzalutamide treatment and have evidence of prostate cancer progression (per PCWG3) Japan cohort
  • Castration resistant prostate cancer that is resistant to SOC or for which no local regulatory approved SOC is available that would confer significant clinical benefit in the medical judgement of the investigator. Patients should have received either abiraterone and/or enzalutamide treatment and have evidence of prostate cancer progression (per PCWG3) China cohort
  • Castration resistant prostate cancer that is intolerant/resistant to SOC or for which no local regulatory approved SOC is available that would confer significant clinical benefit in the medical judgement of the investigator. Patients who refused SOC may be eligible. Patients should have received either abiraterone and/or enzalutamide treatment and have evidence of prostate cancer progression (per PCWG3)

Part 2A:

• Castration resistant prostate cancer. Patients should have received either abiraterone and/or enzalutamide treatment, may have received up to 1 line of chemotherapy and have evidence of prostate cancer progression (per PCWG3)

Part 2B:

  • Castration resistant prostate cancer. Patients should have received abiraterone treatment, may have received up to 1 prior line of chemotherapy, have not received prior enzalutamide, apalutamide or darolutamide and have evidence of prostate cancer progression (per PCWG3)
  • Patients must have radiographic evidence of disease

Other inclusion criteria:

  • Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) of 0 or 1.
  • Adequate organ function

Key Exclusion Criteria:

- Prior Chemotherapy: Part 1C , Japan cohort and China cohort (CRPC): no more than 2 previous regimens of chemotherapy Part 2A: CRPC: no more than 1 previous regimen of systemic chemotherapy Part 2B (CRPC): no more than 1 previous regimen of chemotherapy

  • Prior irradiation to >25% of the bone marrow.
  • QTcF interval >480 msec at screening.
  • Hypertension that cannot be controlled by medications (>150/90 mmHg despite optimal medical therapy).
  • Known or suspected hypersensitivity to PF 06821497 or any components or enzalutamide (CRPC)
  • Active inflammatory gastrointestinal disease, chronic diarrhea, known diverticular disease or previous gastric resection or lap band surgery. Gastroesophageal reflux disease under treatment with proton pump inhibitors is allowed.
  • Current use or anticipated need for food or drugs that are known strong CYP3A4/5 inducers or inhibitors, including their administration within 10 days or 5 half lives of the CYP3A4/5 inhibitor, whichever is longer prior to first dose of investigational product.
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03460977


Contacts
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Contact: Pfizer CT.gov Call Center 1-800-718-1021 ClinicalTrials.gov_Inquiries@pfizer.com

Locations
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Sponsors and Collaborators
Pfizer
Investigators
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Study Director: Pfizer CT.gov Call Center Pfizer
More Information
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Additional Information:

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Responsible Party: Pfizer
ClinicalTrials.gov Identifier: NCT03460977    
Other Study ID Numbers: C2321001
First Posted: March 9, 2018    Key Record Dates
Last Update Posted: May 23, 2023
Last Verified: May 2023
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Plan Description: Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Pfizer:
EZH2
enhancer of zeste homolog 2
castrate resistant prostate cancer
prostatecancer-study.com
CRPC
efficacy
safety
pharmacokinetics
pharmacodynamics
 dose escalation
dose expansion
open-label
small cell lung cancer
SCLC
follicular lymphoma
FL
relapsed
refractory
Additional relevant MeSH terms:
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Lymphoma
Lung Neoplasms
Prostatic Neoplasms
Lymphoma, Follicular
Small Cell Lung Carcinoma
Neoplasms by Histologic Type
Neoplasms
Lymphoproliferative Disorders
Lymphatic Diseases
Immunoproliferative Disorders
Immune System Diseases
Respiratory Tract Neoplasms
Thoracic Neoplasms
 Neoplasms by Site
Lung Diseases
Respiratory Tract Diseases
Genital Neoplasms, Male
Urogenital Neoplasms
Genital Diseases, Male
Genital Diseases
Urogenital Diseases
Prostatic Diseases
Male Urogenital Diseases
Lymphoma, Non-Hodgkin
Carcinoma, Bronchogenic
Bronchial Neoplasms