Relay Therapeutics Reveals Positive Interim Data for RLY-2608

Relay Therapeutics Unveils Promising Data for RLY-2608

Recent interim data highlights significant advancements in the development of RLY-2608, a groundbreaking therapy by Relay Therapeutics for patients undergoing treatment for metastatic breast cancer with specific genetic mutations. The clinical findings indicate a median progression-free survival (PFS) of 11.4 months for second-line (2L) patients suffering from PI3K?-mutated, HR+, HER2- locally advanced or metastatic breast cancer.

Encouraging Clinical Outcomes

According to the data, the combination of RLY-2608 with fulvestrant produced a confirmed overall response rate (ORR) of 39% across all patients involved in the study, with an impressive ORR of 67% among patients with identified kinase mutations. These results further bolster the expected launch of a 2L pivotal study planned for the near future.

ReDiscover: The First-in-Human Study

The research surrounding RLY-2608 is centered on the ReDiscover study, which has been designed to comprehensively assess the safety, tolerability, and initial tumor response when RLY-2608 is combined with fulvestrant. In the most recent data cut-off, a total of 118 patients had been enrolled, with 64 patients receiving the recommended Phase 2 dose (RP2D) of RLY-2608 at 600mg twice daily.

Patient Demographics and Previous Treatments

Patients enrolled in the study exhibited considerable prior treatment exposure:

• 41% had received two or more prior lines of therapy.
• 52% had experienced prior treatments involving selective estrogen receptor degraders (SERDs).
• 25% had undergone chemotherapy or treatment with antibody-drug conjugates (ADCs).
• 59% presented with visceral metastases.
• 34% had obesity characteristics, defined as a BMI of 30 or higher.

Strong Efficacy in Targeted Populations

Among those patients that received the RP2D and did not have co-existing PTEN or AKT mutations, the data revealed a median PFS of 11.4 months specifically for 2L patients. The clinical benefit rate was recorded at 67%, showcasing that most patients displayed significant tumor reduction—a hopeful sign for advanced breast cancer therapies.

Positive Tolerability Profile

Importantly, the combination therapy demonstrated a favorable tolerability profile. Adverse events were mostly low-grade and manageable, and only a small proportion of patients needed to modify their treatment. This is pivotal, as side effects can heavily influence adherence to cancer treatments.

Future Directions for RLY-2608

Relay Therapeutics is determined to progress with two front-line treatment combinations utilizing RLY-2608. These regimens will include both ribociclib and atirmociclib, with ongoing patient enrollment indicating strong potential for these combination therapies to enhance treatment outcomes for difficult-to-treat metastatic breast cancer.

Expected Clinical Developments

• Start the pivotal study of RLY-2608 + fulvestrant in the upcoming year.
• Completion of Phase 1/2 study data to be disclosed in the following year.

Relay Therapeutics maintains a robust financial position, with approximately $840 million in cash and equivalents as of the latest reports. This financial strength is crucial for supporting the anticipated pivotal studies for RLY-2608.

Conference Call Announcement

Relay Therapeutics will be hosting a conference call to discuss these interim findings, where stakeholders can gain further insights into ongoing research and development initiatives. Interested parties can find more information on the company’s official website.

About RLY-2608 and Relay Therapeutics

RLY-2608 represents a significant leap forward within Relay Therapeutics' program to identify and develop treatments specifically targeting mutant forms of PI3K?, a kinase often involved in various cancer types. If approved, RLY-2608 aims to address the substantial need for effective therapies in one of the largest diagnostics populations in the United States.

Frequently Asked Questions

What is RLY-2608?

RLY-2608 is an investigational drug developed by Relay Therapeutics designed to block mutant forms of the PI3K? enzyme, enhancing treatment efficacy for patients with specific types of breast cancer.

How does RLY-2608 compare to existing therapies?

Current data suggest RLY-2608 combined with fulvestrant shows significantly improved progression-free survival compared to traditional PI3K? inhibitors.

What are the next steps for RLY-2608?

Relay Therapeutics plans to initiate a pivotal study for RLY-2608 + fulvestrant and share comprehensive Phase 1/2 clinical data in the near future.

How many patients are participating in the current study?

The ongoing study has enrolled 118 patients thus far, focusing on those with PI3K? mutations in advanced breast cancer.

What financial support does Relay Therapeutics have for their research?

As reported, Relay Therapeutics holds about $840 million in cash and equivalents, which will support ongoing and future clinical studies.

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