Enfortumab Vedotin as Monotherapy in Patients With Metastatic Castration-Resistant Prostate Cancer (ENCORE)

• ClinicalTrials.gov Identifier: NCT04754191
• Recruitment Status: Recruiting
• First Posted: February 15, 2021
• Last Update Posted: February 21, 2022
• Sponsor: University of Utah
• Collaborator: Astellas Pharma Inc
• Information provided by (Responsible Party): University of Utah

Study Description

Brief Summary:

This is an open-label, phase II umbrella trial assessing the anti-tumor activity of enfortumab alone and in combination with other anti-cancer agents in subjects with metastatic castration-resistant prostate cancer. The trial will open to enrollment in Cohort A, enfortumab monotherapy. Additional cohorts may be added as new drug combinations are identified.

Condition or disease	Intervention/treatment	Phase
Metastatic Castration-resistant Prostate Cancer	Drug: Enfortumab vedotin	Phase 2

Study Design

• Study Type: Interventional (Clinical Trial)
• Estimated Enrollment: 34 participants
• Allocation: N/A
• Intervention Model: Single Group Assignment
• Masking: None (Open Label)
• Primary Purpose: Treatment
• Official Title: A Phase 2 Umbrella Protocol of Enfortumab Vedotin as Monotherapy and Combined With Other Agents in Patients With Metastatic Castration-Resistant Prostate Cancer
• Actual Study Start Date: February 3, 2022
• Estimated Primary Completion Date: September 2023
• Estimated Study Completion Date: September 2025

Arms and Interventions

Arm	Intervention/treatment
Experimental: Treatment: all patients; Enfortumab will be administered in monotherapy on days 1, 8, and 15 as part of a 28-day cycle at 1.25 mg/kg up to 125 mg.	Drug: Enfortumab vedotin; Cohort A will be treated with enfortumab vedotin on a 28 day cycle for up to 12 months.

Outcome Measures

Primary Outcome Measures :

1. Proportion subjects achieving one of the following: Objective response by RECIST1.1, Confirmed conversion of circulating tumor cell count (CTC) to <5/7.5 mL blood, PSA decline ≥ 50% (PCWG3), or Stable disease ≥ 6 months per PCWG3 mod.RECIST 1.1 [ Time Frame: 12 months ]
   assess the anti-tumor action of the study therapy in subjects with metastatic castrate-resistant prostate cancer

Eligibility Criteria

• Ages Eligible for Study: 18 Years and older (Adult, Older Adult)
• Sexes Eligible for Study: Male
• Accepts Healthy Volunteers: No

Criteria

Inclusion Criteria:

• Male subject aged ≥ 18 years.
• Histologically or cytologically confirmed adenocarcinoma of the prostate without small cell histology.
• Diagnosis of metastatic or locally advanced, inoperable disease that cannot be treated with definitive intent
• Castrate levels of testosterone as defined as < 50 ng/dL (1.73 nmol/L).
• Prior treatment with at least three or more cycles of docetaxel therapy. Note: Docetaxel in the newly diagnosed metastatic setting and docetaxel rechallenge allowed.
• Prior treatment with at least one prior Novel Hormone Therapy (NHT), defined as second-generation antiandrogen therapies that include but are not limited to abiraterone acetate, enzalutamide, apalutamide, and darolutamide.
• Subject has received or refused therapies other than cabazitaxel which have shown to improve overall survival and are recommended per NCCN guidelines prior to enrollment in trial. Such agents include but are not limited to sipuleucel-T, olaparib, rucaparib, and radium-223 depending on patient eligibility.
• Had disease progression on or after NHT prior to enrolling in the study.
• ECOG Performance Status ≤ 2.

• Adequate organ function as defined as:

  • Hematologic:

    • White blood cell count (WBC) ≥ 2000/mm3
    • Absolute neutrophil count (ANC) ≥ 1500/mm3
    • Platelet count ≥ 100,000/mm3
    • Hemoglobin ≥ 9g/dL

  • Hepatic:

    • Total Bilirubin ≤ 1.5x institutional upper limit of normal (ULN) unless there is a known history of Gilbert's syndrome.
    • AST(SGOT)/ALT(SGPT) ≤ 5 × institutional ULN

  • Renal:

    • Estimated creatinine clearance ≥ 30 mL/min by Cockcroft-Gault formula:
• Highly effective contraception throughout the study as described in Section 7.4.
• Discontinued all previous treatments for cancer (except androgen-deprivation therapy and bone loss prevention treatment) 28 days prior to starting study therapy.
• Recovery to baseline or ≤ Grade 1 CTCAE v 5.0 from toxicities related to any prior treatments, unless AE(s) are clinically non-significant and/or stable on supportive therapy as determined by the treating physician.
• Able to provide informed consent and willing to sign an approved consent form that conforms to federal and institutional guidelines.

Exclusion Criteria:

• Prior or concurrent malignancy (other than adenocarcinoma of the prostate). Note: Patients with prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial as approved by the Principal Investigator.
• The subject has an uncontrolled, significant intercurrent or recent illness that would preclude safe study participation.
• Clinically significant cardiovascular disease: myocardial infarction (<6 months prior to enrollment), unstable angina, congestive heart failure (> New York Heart Association Classification Class IIB) or a serious cardiac arrhythmia requiring medication.
• Known HIV infection with a detectable viral load at the time of screening. Note: Patients on effective antiretroviral therapy with an undetectable viral load at the time of screening are eligible for this trial.
• Known chronic hepatitis B virus (HBV) or hepatitis C virus (HCV) infection with a detectable viral load.

Note: Patients with an undetectable HBV viral load are eligible. Patients with an undetectable HCV viral load are eligible.

• Live attenuated vaccinations within ≤ 4 weeks of the first study therapy and while on trial is prohibited.
• Known prior severe hypersensitivity to investigational product or any component in its formulations, including known severe hypersensitivity reactions to monoclonal antibodies (NCI CTCAE v5.0 Grade ≥ 3).
• Subjects taking prohibited medications as described in Section 6.3. A washout period of prohibited medications for a period of at least 5 half-lives or as clinically indicated should occur prior to the start of treatment.

Contacts and Locations

Contacts

Contact: Susan Sharry; 801-585-3453; susan.sharry@hci.utah.edu

Locations

United States, Utah

Huntsman Cancer Institute; Recruiting

Salt Lake City, Utah, United States, 84112

Contact: Susan Sharry 801-585-3453 susan.sharry@hci.utah.edu

Principal Investigator: Umang Swami, MD

Sponsors and Collaborators

University of Utah

Astellas Pharma Inc

Investigators

• Principal Investigator: Umang Swami, MD; Huntsman Cancer Institute

More Information

• Responsible Party: University of Utah
• ClinicalTrials.gov Identifier: NCT04754191
• Other Study ID Numbers: HCI137651
• First Posted: February 15, 2021
• Last Update Posted: February 21, 2022
• Last Verified: December 2021

Individual Participant Data (IPD) Sharing Statement:

• Plan to Share IPD: No

• Studies a U.S. FDA-regulated Drug Product: Yes
• Studies a U.S. FDA-regulated Device Product: No

Additional relevant MeSH terms:

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