Study of Oral MRT-2359 With Apalutamide in Prostate Cancer (MODeFIRe-1)

Monte Rosa Therapeutics

Status and phase

Enrolling

Phase 2

Conditions

Prostate Cancer (Adenocarcinoma)

Castration-Resistant Prostate Cancer

Castration-Resistant Prostate Cancer (CRPC)

Prostate Cancer

Treatments

Drug: Oral MRT-2359

Drug: Apalutamide

Study type

Interventional

Funder types

Industry

Identifiers

NCT07745361

MRT-2359-002

Details and patient eligibility

About

This Phase 2, open-label, multicenter study is conducted in patients with castration-resistant prostate cancer.

Patients in this study receive MRT-2359, an investigational oral medicine, in combination with apalutamide, an oral medicine used to treat prostate cancer. The main purpose of the study is to assess whether this treatment combination can lower prostate-specific antigen (PSA) The study will also evaluate the safety and tolerability of the treatment combination and assess additional measures of anti-tumor activity.

Full description

This Phase 2, open-label, multicenter study is designed to assess the efficacy, safety, tolerability, pharmacokinetic (PK), pharmacodynamic (PD), and clinical activity of MRT-2359 in combination with apalutamide in patients with castration-resistant prostate cancer.

The primary aim of the study is to assess the PSA response rate of MRT-2359 in combination with apalutamide as determined by PCWG4 criteria.

Secondary aims include further evaluation of safety and tolerability, additional measures of anti-tumor activity, and characterization of the PK profile of MRT-2359 in combination with apalutamide.

Enrollment

25 estimated patients

Sex

Male

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Age > 18 years
A predicted life expectancy of ≥ 3 months and an ECOG performance status ≤ 1
Have histologically or cytologically confirmed castration-resistant adenocarcinoma of the prostate without small cell histology and with androgen receptor (AR) mutations
Have not had prior treatment with more than 1 prior taxane-based chemotherapy regimen for castration-resistant prostate cancer
Have no prior treatment with an AR degrader, opevesostat, or similar therapy
Has ongoing (chemical or surgical) androgen deprivation with serum testosterone < 50 ng/dL (< 1.7 nM)
Has received prior treatment with poly(ADP-ribose) polymerase (PARP) inhibitor, if appropriate, or deemed ineligible to receive treatment by the Investigator, or has refused PARP inhibitor treatment
Has received prior treatment with at least 1 line of ARPi
Have disease measurable per Prostate Cancer Working Group 4 (PCWG4) criteria, with or without measurable disease by RECIST 1.1
Be able to provide a tumor biopsy for biomarker analysis during the Screening period
Have adequate organ function

Exclusion criteria

• Have received prior chemotherapy, definitive radiation, or biological cancer therapy within 21 days before the first dose of study treatment or have any AEs that have failed to recover to baseline
- Have received prior therapy with a GSPT1 degrader that was discontinued due to an AE
- Have received prior auto-HCT and have not fully recovered from effects of the last transplant
- Have received allogeneic hematopoietic stem cell transplantation within past 6 months and/or have symptoms of graft-versus-host disease
- Current use of chronic systemic steroid therapy in excess of replacement doses
- Have clinically active central nervous system involvement and/or carcinomatous meningitis
- Have a confirmed history of (noninfectious) pneumonitis that required steroids
- Clinically significant cardiac disease