A Phase 1/1b Study of MEDI3726 in Adults Subjects With Metastatic Castration Resistant Prostate Cancer

Phase 1

Completed

• Conditions: Metastatic Castration Resistant Prostate Cancer
• Interventions: Biological: MEDI3726 Post-Chemo; Biological: MEDI3726 Pre-Chemo; Biological: MEDI3726 & Enzalutamide Combo

• Registration Number: NCT02991911
• Lead Sponsor: MedImmune LLC

Brief Summary

The purpose of this study is to assess the safety and tolerability, describe the dose-limiting toxicities (DLTs), and determine the maximum tolerated dose (MTD) or maximum administered dose (MAD \[in the absence of establishing the MTD\]) for single agent MEDI3726 in subjects with mCRPC who have received prior treatment with abiraterone or enzalutamide, with or without a prior taxane-based chemotherapy in the mCRPC setting.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2016-12-01
• Study First Submitted QC: 2016-12-09
• Study First Posted: 2016-12-14
• Study Start: 2017-01-06
• Primary Completion: 2019-09-30
• Study Completion: 2019-09-30
• Status Verified: 2020-01
• Last Update Submitted: 2020-01-14
• Last Update Posted: 2020-01-18

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 33

Inclusion Criteria

• Age ≥ 18 years at the time of screening.

• Histologically confirmed diagnosis of metastatic castration-resistant prostate adenocarcinoma (mCRPC).

• Documented PD in subjects with mCRPC as assessed by the Investigator and defined by at least one of the following according to the PCWG3 criteria:

  1. Radiographic progression.
  2. PSA progression.

• Prior exposure to abiraterone or enzalutamide of at least 12 weeks in the mCRPC setting.

NOTE: Subjects who have received both abiraterone and enzalutamide in the mCRPC setting are eligible.

• In dose escalation: Prior taxane-based chemotherapy in the mCRPC setting is:

  1. Required for Arm A.
  2. Excluded for Arm B.
  3. Optional for Arm C.

Exclusion Criteria

• Subjects with neuroendocrine, neuroendocrine differentiation and/or small cell prostate cancer.

• The subject has received any conventional or investigational anti-cancer treatment within 21 days before the first dose of investigational product, with the following modifications:

  1. At least 14 days before the first dose of investigational product since completion of treatment with abiraterone or enzalutamide
  2. At least 14 days before the first dose of investigational product since completion of prior taxane-based chemotherapy
  3. At least 28 days before the first dose of investigational product since completion of treatment with Radium-223.
  4. At least 42 days before the first dose of investigational product since completion of prior bicalutamide and nilutamide treatment.

NOTE: An LHRH agonist or antagonist required for ongoing testosterone suppression will be permitted if Inclusion Criterion is satisfied.

• Prior exposure to PSMA-directed therapies.

• Subjects with previous radiotherapy for the treatment of unresectable, locally advanced or metastatic prostate cancer are excluded if:

  1. More than 25% of marrow-bearing bone has been irradiated.
  2. The last fraction of radiotherapy has been administered within approximately 2 weeks prior to the first dose of investigational product.

• Brain metastases that are untreated, symptomatic, or require therapy to control symptoms; or any radiation, surgery, or other therapy to control symptoms from brain metastases within 2 months prior to the first dose of investigational product.

• Subjects with known history of peripheral vasculopathies including, but not limited to, macro and microangiopathies secondary to diabetes, peripheral arteriopathy of any cause, intermittent claudication, repeated and/or non-healing ulcers of any cause.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Arm A	MEDI3726 Post-Chemo	MEDI3726 Post-Chemo
Arm B	MEDI3726 Pre-Chemo	MEDI3726 Pre-Chemo
Arm C	MEDI3726 & Enzalutamide Combo	MEDI3726 \& Enzalutamide Combo

Primary Outcome Measures

Name	Time	Method
Number of patients with changes in vital signs from baseline	From time of informed consent through 21 days after last dose of MEDI3726	Safety Endpoint
Number of patients with changes in laboratory parameters from baseline	From time of informed consent through 90 days after last dose of MEDI3726	Safety Endpoint
Occurrence of adverse events (AEs)	From time of informed consent through 90 days after last dose of MEDI3726	Safety Endpoint
Occurrence of serious adverse events (SAEs)	From time of informed consent through 90 days after last dose of MEDI3726	Safety Endpoint
Occurrence of dose-limiting toxicities (DLTs)	From time of first dose through 21 days after first dose of MEDI3726	Safety Endpoint
Number of patients with changes in electrocardiogram (ECG) results from baseline	From time of informed consent through 21 days after last dose of MEDI3726	Safety Endpoint

Secondary Outcome Measures

Name	Time	Method
PSA50 response	From time of fist dose through at least 12 weeks after first dose of MEDI3726	Reduction in PSA level of 50% (PSA50) or more compared with baseline
MEDI3726 plasma concentrations for pharmacokinetics (PK)	From time of informed consent through 90 days after last dose of MEDI3726
MEDI3726 terminal half-life for PK	From time of informed consent through 90 days after last dose of MEDI3726
Response Evaluation Criteria in Solid Tumors (RECIST) response	From time of informed consent through 90 days after last dose of MEDI3726	Response according to RECIST version 1.1
Circulating Tumor Cell (CTC) response	From time of informed consent through 90 days after last dose of MEDI3726	Conversion in the CTC count defined as a reduction from ≥ 5 cells/7.5 mL blood to \< 5 cells/7.5 mL blood with a confirmatory assessment at least 4 weeks later
Number and percentage of subjects who develop anti-drug antibodies (ADAs)	From time of informed consent through 90 days after last dose of MEDI3726	To determine the immunogenicity of MEDI3726
MEDI3726 area under the concentration-time curve for PK	From time of informed consent through 90 days after last dose of MEDI3726
MEDI3726 maximum observed concentration for PK	From time of informed consent through 90 days after last dose of MEDI3726
Safety and tolerability of MEDI3726 in combination with Enzalutamide	From time of informed consent through 90 days after last dose of MEDI3726 with enzalutamide	Measured by occurrence of AEs, SAEs, DLTs and number of patients with changes in laboratory parameters, vital signs, and ECG results from baseline
MEDI3726 clearance for PK	From time of informed consent through 90 days after last dose of MEDI3726

Trial Locations

Locations (1)

Research Site; 🇬🇧 London, United Kingdom