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Repare Therapeutics Doses First Patient in Phase 1 Clinical Trial of RP-6306 in Combination with Gemcitabine for the Treatment of Advanced Solid Tumors

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Repare Therapeutics (NASDAQ: RPTX) has commenced its Phase 1 clinical trial for RP-6306, a pioneering small molecule targeting PKMYT1, combined with gemcitabine for treating advanced solid tumors. The trial, named MAGNETIC, aims to dose approximately 104 patients selected based on genomic alterations. The primary goals include determining the maximum tolerated dose and evaluating preliminary anti-tumor activity. This milestone follows ongoing developments in Repare's precision oncology pipeline, which features several innovative therapeutic candidates.

Positive
  • Initiation of Phase 1 trial for RP-6306 targeting PKMYT1.
  • Trial aims to assess safety and tolerability in combination with gemcitabine.
  • Approximately 104 patients will be enrolled, focusing on genetically selected tumors.
Negative
  • None.

CAMBRIDGE, Mass. & MONTREAL--(BUSINESS WIRE)-- Repare Therapeutics Inc. (“Repare” or the “Company”) (Nasdaq: RPTX), a leading clinical-stage precision oncology company enabled by its proprietary synthetic lethality approach to discover and develop novel therapeutics, today announced the first patient has been dosed in the Company’s Phase 1 clinical trial of RP-6306, a first-in-class small molecule candidate targeting PKMYT1, in combination with gemcitabine for the treatment of molecularly selected advanced solid tumors (NCT05147272) (the “MAGNETIC” trial).

“Dosing of the first patient in the Phase 1 RP-6306 trial in combination with gemcitabine, alongside our ongoing monotherapy “MYSTIC” trial, is an exciting milestone for Repare as we continue to advance our unique precision oncology pipeline across multiple fronts,” said Maria Koehler MD, PhD, Chief Medical Officer of Repare. “MAGNETIC will assess the safety and tolerability of RP-6306 in combination with gemcitabine. It will enroll approximately 104 patients with tumors harboring genomic alterations that were identified through Repare’s proprietary STEP2 screens. We look forward to providing updates on RP-6306 later in 2022.”

This multicenter Phase 1 study aims to determine the maximum tolerated dose (MTD), identify a recommended phase 2 dose (RP2D) and preferred schedule, and assess preliminary anti-tumor activity.

About RP-6306

RP-6306 is a first-in-class, selective, orally available inhibitor of PKMYT1 that was discovered and developed entirely in-house by Repare. Through Repare’s SNIPRx screen campaign for targets that are SL with CCNE1 amplification, the Company identified and validated this novel SL gene that has the characteristics of a therapeutic target. Repare has developed novel and selective inhibitors against PKMYT1, which demonstrated compelling pre-clinical anti-tumor activity alone and in combination with certain anticancer agents, and subsequently announced the advancement of a clinical candidate to this potential, first-in-class program.

About Repare Therapeutics, Inc.

Repare Therapeutics is a leading clinical-stage precision oncology company enabled by its proprietary synthetic lethality approach to the discovery and development of novel therapeutics. The Company utilizes its genome-wide, CRISPR-enabled SNIPRx® platform to systematically discover and develop highly targeted cancer therapies focused on genomic instability, including DNA damage repair. The Company’s pipeline includes its lead product candidate RP-3500, a potential leading ATR inhibitor, currently in Phase 1/2 clinical development, its second clinical candidate RP-6306, a PKMYT1 inhibitor, currently in Phase 1 clinical development, a Polθ inhibitor program, as well as eight other early-stage, pre-clinical programs. For more information, please visit reparerx.com.

SNIPRx® is a registered trademark of Repare Therapeutics Inc.

Repare Contact:

Steve Forte

Chief Financial Officer

Repare Therapeutics Inc.

info@reparerx.com

Investors:

Kimberly Minarovich

Argot Partners

repare@argotpartners.com

Media:

David Rosen

Argot Partners

david.rosen@argotpartners.com

212-600-1902

Source: Repare Therapeutics Inc.

FAQ

What is the purpose of the MAGNETIC trial for RPTX?

The MAGNETIC trial evaluates the safety and tolerability of RP-6306 in combination with gemcitabine for advanced solid tumors.

How many patients will be enrolled in the RP-6306 clinical trial?

Approximately 104 patients with tumors identified through Repare's proprietary screening will be enrolled.

When was the first patient dosed in the RP-6306 trial?

The first patient was dosed recently as part of the Phase 1 clinical trial for RP-6306.

What are the next steps following the RP-6306 trial's initiation?

Updates on RP-6306's progress and results are expected later in 2022.

What is the significance of RP-6306 in cancer treatment?

RP-6306 is a first-in-class, selective inhibitor of PKMYT1, designed to target tumors with specific genomic alterations.

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