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MRT-2359

Phase 2

Castration-Resistant Prostate Cancer (CRPC) | Small molecule | Oncology |Monte Rosa Therapeutics, Inc.|Last Updated: Aug 24, 2026

Target and mechanism

Molecular targetGSPT1
Target classProtein
ModalitySmall molecule

Also known as Oral MRT-2359

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment25

FDA Designations

No designations recorded

Clinical trial landscape

MRT-2359 · 2 trials · 11 indications

Phase 2 1Phase 1 1
NCT07745361Study of Oral MRT-2359 With Apalutamide in Prostate CancerCastration-Resistant Prostate Cancer (CRPC)
RECRUITING25 Analytics
PHASE2RECRUITING
Study of Oral MRT-2359 With Apalutamide in Prostate Cancer
Castration-Resistant Prostate Cancer (CRPC)Unlock trial analytics

Study Endpoints

Primary Endpoints

Assess the efficacy of MRT-2359 combined with apalutamide
14 months

Assess the efficacy of MRT-2359 combined with apalutamide using the PSA response rate as determined by PCWG4 criteria in participants with measurable and/or evaluable disease

Phase 1 Evaluates safety and tolerability of MRT-2359 over a 28-day cycle by the occurrence and frequency of dose limiting toxicities (DLTs) for determination of the MTD and/or RP2D
28 days
Phase 2 Evaluates preliminary anti-tumor activity of MRT-2359 by overall response rate (ORR) as determined by RECIST 1.1
56 days (up to approximately 24 months from screening to end of study participation

Secondary Endpoints

Further evaluation of the safety and tolerability of MRT-2359 administered orally in combination with apalutamide
20 months
To assess additional measures of the efficacy of MRT-2359 in combination with apalutamide
20 months
To characterize the population pharmacokinetic profile of MRT-2359 in combination with apalutamide
20 months
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
MRT-2359 + ApalutamideEXPERIMENTALParticipants with castration-resistant prostate cancer will receive MRT-2359 in combination with apalutamide.
Phase 1 Dose EscalationEXPERIMENTALPatients with NSCLC, SCLC, high-grade neuroendocrine cancer of any primary site, any solid tumors with L-MYC or N-MYC amplification, or DLBCL
Phase 2 Expansion - NSCLCEXPERIMENTALPatients with NSCLC with high or low L-MYC or N-MYC expression
Phase 2 Expansion - SCLCEXPERIMENTALPatients with SCLC
Phase 2 Expansion - L-MYC or N-MYC amplified solid tumorsEXPERIMENTALPatients with L-MYC or N-MYC amplified solid tumors
Phase 2 Expansion - HR-positive, HER2-negative breast cancerEXPERIMENTALPatients with HR-positive, HER2-negative breast cancer in combination with fulvestrant
Phase 2 Expansion - Prostate CancerEXPERIMENTALPatients with prostate cancer in combination with enzalutamide

Interventions

NameTypeDescription
Oral MRT-2359DRUGOrally administered tablets of MRT-2359
ApalutamideDRUGOrally administered apalutamide
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites14

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...

Countries:United States
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Recent Changes (Last 90 Days)

LOWAug 24, 2026NCT07745361lastUpdatePostDate: changed
LOWAug 24, 2026NCT07745361lastUpdatePostDate: changed
LOWAug 4, 2026NCT07745361NEW_TRIAL: changed
LOWAug 4, 2026NCT07745361NEW_TRIAL: changed

Frequently asked questions about MRT-2359

What is MRT-2359 used for?

MRT-2359 is an investigational oral small molecule being studied for the treatment of Castration-Resistant Prostate Cancer (CRPC) and NSCLC. It is also being evaluated in other cancer types including SCLC, high grade neuroendocrine cancer, DLBCL, and L-MYC and N-MYC amplified solid tumors.

What does MRT-2359 target?

MRT-2359 targets GSPT1, a protein involved in translation termination. By modulating GSPT1, the drug aims to disrupt protein synthesis in cancer cells, potentially leading to anti-tumor effects. This mechanism is being explored in clinical trials for various solid tumors.

Who makes MRT-2359?

MRT-2359 is being developed by Monte Rosa Therapeutics, Inc., a biopharmaceutical company. The company's stock is traded under the ticker symbol GLUE on the NASDAQ exchange.

What phase is MRT-2359 in?

MRT-2359 is in Phase 2 clinical development. It is currently being studied in a Phase 2 trial for Castration-Resistant Prostate Cancer, and it has completed Phase 1 testing in a broader patient population. The drug is investigational and not yet approved by regulatory authorities.

What clinical trials is MRT-2359 in?

MRT-2359 is being evaluated in two clinical trials. NCT05546268 is a Phase 1 study in patients with various cancers including NSCLC and prostate cancer, which is active but not recruiting. NCT07745361 is a Phase 2 study combining MRT-2359 with apalutamide in prostate cancer, which is currently recruiting.

Is MRT-2359 the same as Oral MRT-2359?

Yes, MRT-2359 is also known as Oral MRT-2359. The oral formulation is the form being tested in clinical trials, and both names refer to the same investigational drug developed by Monte Rosa Therapeutics.