A Clinical Study of ONCT-534 in Subjects With Metastatic Castration-resistant Prostate Cancer.

NCT05917470 | Terminated Phase 1 Results FDA Drug

• 1 other identifier: ONCT-534-101
• Study Type: interventional
• Target: 21
• Locations: 2 countries
• Sites: 10

Brief Summary

A first-in-human clinical trial to test the investigational treatment ONCT-534 in participants with metastatic castration-resistant prostate cancer. The main questions it aims to answer are:

• What are the most tolerable doses of ONCT-534? (Phase 1)
• Does ONCT-534 have anti-tumor activity at tolerable doses? (Phase 2) This is a dose escalation and expansion study where participants will receive daily oral doses of ONCT-534.

Conditions

Metastatic Castration-resistant Prostate Cancer

Keywords

Metastatic Prostate Cancer

Outcome Measures

Primary Outcomes (1)

• Dose Limiting Toxicities Through Study Day 28

  Incidence of DLTs through Study Day 28

  Number of Participants with Dose Limiting Toxicities Through Study Day 28

Secondary Outcomes (1)

• Reduction of Prostate-Specific Antigen (PSA) by More Than 50%

  Up to 51 Weeks

Study Arms (8)

Dose Level 1: 40mg QD

EXPERIMENTAL

40mg of single agent ONCT-534 to be administered daily in oral tablets

Drug: ONCT-534

Dose Level 2: 80mg QD

EXPERIMENTAL

80mg of single agent ONCT-534 to be administered daily in oral tablets

Drug: ONCT-534

Dose Level 3: 160mg QD

EXPERIMENTAL

160mg of single agent ONCT-534 to be administered daily in oral tablets

Drug: ONCT-534

Dose Level 4: 300mg QD

EXPERIMENTAL

300mg of single agent ONCT-534 to be administered daily in oral tablets

Drug: ONCT-534

Dose Level 5: 600mg QD

EXPERIMENTAL

600mg of single agent ONCT-534 to be administered daily in oral tablets

Drug: ONCT-534

Dose Level 6: 1200 mg QD

EXPERIMENTAL

1200mg of single agent ONCT-534 to be administered daily in oral tablets

Drug: ONCT-534

BID Dose Level 1: 160 mg BID

EXPERIMENTAL

600mg of single agent ONCT-534 to be administered daily in oral tablets

Drug: ONCT-534

BID Dose Level 2: 300 mg BID

EXPERIMENTAL

300mg of single agent ONCT-534 to be administered twice daily in oral tablets

Drug: ONCT-534

Interventions

ONCT-534 DRUG

ONCT-534 is a dual-action androgen receptor inhibitor (DAARI) with a novel mechanism of action that includes inhibition of AR function and degradation of the AR protein mediated by interaction with the N-terminal domain (NTD) of the AR. ONCT-534 has demonstrated preclinical activity in prostate cancer models against both unmutated androgen receptor (AR), and against multiple forms of AR alteration, including those with AR amplification, mutations in the AR ligand binding domain (LBD), and splice variants with loss of the AR LBD.

Also known as: GTx-534, UT-34

BID Dose Level 1: 160 mg BID; BID Dose Level 2: 300 mg BID; Dose Level 1: 40mg QD; Dose Level 2: 80mg QD; Dose Level 3: 160mg QD; Dose Level 4: 300mg QD; Dose Level 5: 600mg QD; Dose Level 6: 1200 mg QD

Eligibility Criteria

• Age: 18 Years+
• Sex: male
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Subject is ≥18 years of age
• Subject has histologically documented metastatic adenocarcinoma of the prostate confirmed by biopsy without neuroendocrine differentiation or small cell features.
• Subjects has a history of metastatic CRPC.
• Subject has R/R disease following treatment with at least one next-generation AR-signaling inhibitor.
• Subject has at least 1 measurable lesion according to Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 criteria or evaluable bony disease. Lesions that have been previously irradiated will be considered measurable only if progression has been documented following completion of radiation therapy.
• Subject has an Eastern Cooperative Oncology Group performance status of 0,1 or 2, and life expectancy of ≥ 6 months.
• Subject agrees to take or continue luteinizing hormone-releasing hormone agonist or antagonist therapy or has undergone bilateral orchiectomy.
• At least 2 weeks or five half-lives have elapsed, whichever is earliest, since last systemic therapy, including taxanes or other chemotherapy. At least one month has elapsed since systemic therapy with radionuclide pharmaceutical agents
• Subject has evidence of disease progression on or after their most recent systemic treatment
• Subject has a PSA level ≥ 10 ng/mL, or ≥ 2 ng/mL and ≥ 50% increase from nadir on prior therapy, whichever is lowest.
• Subject has serum testosterone \< 50 ng/dL.
• Subject has adequate renal, hepatic, and pulmonary function
• Subject is committed to practice true abstinence, or use a highly effective method of contraception with any female partner of childbearing potential unless documented to be surgically sterile (i.e., vasectomy or bilateral orchiectomy) and to not make semen donations during the study and for 3 months after the last dose of study drug.

You may not qualify if:

• Subject has small cell prostate cancer or neuroendocrine disease histology, including mixed histology.
• Subject has metastases to the brain or central nervous system
• Subject is receiving concurrent anti-cancer therapy (including chemotherapy, antibody therapy, immunotherapy, cellular therapy, or other experimental therapies) except for ongoing androgen inhibiting therapy such as luteinizing hormone-releasing hormone (LHRH) agonists. Supportive non-cancer directed therapies such as bisphosphonates or denosumab are allowed.
• Subjects taking a strong inhibitor of CYP3A4 or a substrate of CYP2C9 or CYP2C19
• Subject had major surgery within 30 days prior to start of study drug.
• Subject has current, untreated pathologic long-bone fractures(s), or risk of imminent pathologic fracture(s).
• Subject has current or imminent spinal cord compression.
• Subject has an active seizure disorder or a history of seizure disorder(s).
• Subject has evidence of active human immunodeficiency virus infection, hepatitis B virus (HBV), or hepatitis C virus (HCV)
• Subject has any other serious illness or medical condition that would interfere with study participation
• Subject has abnormal electrocardiograms (ECGs) that are clinically significant, including average QTcF \> 450 ms, or a history of Torsade de Pointes.
• Subject has any infection requiring parenteral antibiotic therapy or causing fever (temperature \>100.5°F or 38.1°C) within 1 week prior to first dose.
• Clinically significant other malignancy with the potential to confound study assessments, with the exception of e.g., treated cutaneous squamous cell and basal carcinomas, non-muscle invasive bladder cancer, Rai Stage 0 CLL, and adequately treated Stage 1 to 2 non-cutaneous malignancy in remission for 5 years.
• Subject is unable to comply with the protocol and/or not willing or not available for follow-up assessments
• Subject has any medical intervention or other condition which, in the opinion of the Investigator, could compromise adherence with study requirements or otherwise compromise the study's objectives.

Sponsors & Collaborators

• Oncternal Therapeutics, Inc: lead

Study Sites (10)

University of California San Francisco

San Francisco, California, 94143, United States

Location

Karmanos Cancer Institute

Detroit, Michigan, 48201, United States

Location

XCancer Omaha

Omaha, Nebraska, 68130, United States

Location

Columbia University Medical Center

New York, New York, 10032, United States

Location

NEXT Oncology

Austin, Texas, 78758, United States

Location

NEXT Oncology

San Antonio, Texas, 78229, United States

Location

Next Virginia

Fairfax, Virginia, 22031, United States

Location

Fred Hutchinson Cancer Center

Seattle, Washington, 98109, United States

Location

University of Wisconsin Carbone Cancer Center

Madison, Wisconsin, 53792, United States

Location

The Royal Marsden NHS Trust

Sutton, Surrey, SM2 5PT, United Kingdom

Location

MeSH Terms

Conditions

Prostatic Neoplasms

Condition Hierarchy (Ancestors)

Genital Neoplasms, Male; Urogenital Neoplasms; Neoplasms by Site; Neoplasms; Genital Diseases, Male; Genital Diseases; Urogenital Diseases; Prostatic Diseases; Male Urogenital Diseases

Results Point of Contact

• Title: Mary Breitmeyer
• Organization: Oncternal Therapeutics

mbreitmeyer@oncternal.com

760-703-2802

Study Officials

• Salim Yazji, MD

  Oncternal Therapeutics

  STUDY DIRECTOR

Publication Agreements

• PI is Sponsor Employee: No
• Restrictive Agreement: No

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SEQUENTIAL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: June 7, 2023
• First Posted: June 23, 2023
• Study Start: September 20, 2023
• Primary Completion: September 12, 2024
• Study Completion: September 12, 2024
• Last Updated: December 11, 2024
• Results First Posted: December 11, 2024

Record last verified: 2024-12

Locations

US (9); GB (1)