Merck Halts Development of Vibostolimab and Favezelimab

Merck Halts Development of Key Clinical Trials

Merck (NYSE: MRK), also known as MSD in various regions, has made a significant announcement regarding its clinical trials involving two investigational drugs, vibostolimab and favezelimab. After careful consideration and a thorough evaluation of the available data, Merck has decided to discontinue its clinical development programs for both of these promising candidates.

Discontinuation of the KeyVibe Trials

Overview of KeyVibe Trials

The KeyVibe program was designed to explore the efficacy of vibostolimab, an anti-TIGIT antibody, in combination with pembrolizumab (KEYTRUDA). Merck has opted to stop the Phase 3 KeyVibe-003 and KeyVibe-007 trials, which investigated the fixed-dose combination for treating non-small cell lung cancer (NSCLC). This decision comes in light of a recommendation from an independent Data Monitoring Committee (DMC) following a pre-planned analysis that indicated futility regarding overall survival rates in these trials.

Safety Profile Observations

Throughout the studies, the safety profile of the vibostolimab and pembrolizumab combination was consistent with previously reported data. However, it was noted that the combination treatment resulted in a higher incidence of immune-related adverse events compared to pembrolizumab alone, which is expected when utilizing dual checkpoint inhibitors. Considering all available data from the KeyVibe studies, Merck has also halted the Phase 3 KeyVibe-006 trial.

End of Favezelimab Development Program

KEYFORM Program Insights

In parallel, Merck has decided to terminate the clinical development of favezelimab, an anti-LAG-3 antibody, ceasing enrollment in the Phase 3 KEYFORM-008 trial. This specific trial assessed the combination of favezelimab and pembrolizumab in patients with relapsed or refractory classical Hodgkin lymphoma (cHL). Notably, patients already enrolled in the trial will continue with their treatment until its conclusion.

Future Focus in Oncology

Merck’s decision was driven by an intention to prioritize the advancement of other promising candidates within its extensive oncology pipeline. This move is not indicative of any safety concerns regarding the combination of favezelimab and pembrolizumab. Instead, it reflects a strategic redirection towards alternative therapies that demonstrate a greater potential for clinical success.

Merck Engages with Clinical Trial Participants

As part of this transition, Merck is actively communicating with study investigators involved in the clinical trials. The company encourages participants to reach out to their respective study teams or physicians to discuss their treatment options and next steps. Data analysis for both Phase 3 trials remains ongoing, and findings will be communicated to the scientific community for further scrutiny.

Insights from Merck’s Leadership

Dr. Marjorie Green, senior vice president and head of oncology at Merck Research Laboratories, remarked on the decision, stating, "Following a careful analysis of the data, we have decided to discontinue the development of these candidates to prioritize our ongoing programs. We are thankful to all the patients, caregivers, and investigators who contributed to these important studies." Dr. Green emphasized their commitment to advancing innovative science that holds the greatest potential for improving the outcomes of cancer patients.

About the Investigational Drugs

What is Vibostolimab?

Vibostolimab is a humanized investigational antibody targeting TIGIT, known for its potential to restore anti-tumor activity via immune modulation. By blocking the TIGIT receptor, it aims to enhance T cell engagement against cancer cells.

Understanding Favezelimab

Favezelimab, on the other hand, is an anti-LAG-3 antibody designed to counterbalance immune suppression in tumors by inhibiting the LAG-3 receptor. This mechanism aims to reinvigorate T cell function, making it a potential ally in cancer immunotherapy.

About KEYTRUDA®

KEYTRUDA (pembrolizumab) is Merck’s flagship anti-PD-1 therapy, effective in enhancing the body’s immune response to tackle tumor cells. It represents a groundbreaking option in the treatment landscape for various cancers, including NSCLC and classical Hodgkin lymphoma, by facilitating T cell activation.

Merck’s Continued Commitment to Oncology

Merck has established a large-scale immuno-oncology clinical program involving over 1,600 trials aimed at studying KEYTRUDA in a varied range of cancers and treatment settings. The goal remains to uncover actionable insights that could lead to enhanced patient treatment outcomes, backed by a commitment to inclusive clinical practices and research advancements.

Frequently Asked Questions

What led to the discontinuation of the KeyVibe and KEYFORM programs?

Merck discontinued these programs following a recommendation from a Data Monitoring Committee based on pre-specified criteria indicating futility in achieving the primary endpoints of overall survival.

Will current study participants still receive treatment?

Yes, patients currently enrolled in the trials will continue their treatment until the study concludes.

What is the focus of Merck's oncology pipeline now?

Merck intends to prioritize other candidates within its diverse oncology pipeline, enhancing its commitment to explore therapies with greater potential for clinical success.

How does vibostolimab work?

Vibostolimab is designed to enhance antitumor immunity by blocking the TIGIT receptor, consequently activating T lymphocytes to attack cancer cells.

What is the significance of KEYTRUDA in cancer treatment?

KEYTRUDA is pivotal in oncology as it harnesses the body’s immune system to combat tumors, offering treatment options across multiple cancer types.

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