ON December 7, 2023 Bristol Myers Squibb (NYSE: BMY) reported the Phase 3 CheckMate -8HW trial evaluating Opdivo (nivolumab) plus Yervoy (ipilimumab) compared to investigator’s choice of chemotherapy as a first-line treatment for patients with microsatellite instability–high (MSI-H) or mismatch repair deficient (dMMR) metastatic colorectal cancer (mCRC) met the dual primary endpoint of progression-free survival (PFS) as assessed by Blinded Independent Central Review (BICR) at a pre-specified interim analysis (Press release, Bristol-Myers Squibb, DEC 7, 2023, View Source;8HW-Trial-Evaluating-Opdivo-nivolumab-Plus-Yervoy-ipilimumab-Compared-to-Chemotherapy-in-Microsatellite-InstabilityHigh-or-Mismatch-Repair-Deficient-Metastatic-Colorectal-Cancer-Meets-Primary/default.aspx [SID1234638231]).
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The dual immunotherapy combination of Opdivo plus Yervoy demonstrated a statistically significant and clinically meaningful improvement in PFS compared to chemotherapy. The safety profile for the combination of Opdivo plus Yervoy remained consistent with previously reported data and was manageable with established protocols, with no new safety signals identified.
"The benefits of Opdivo plus Yervoy in MSI-H/dMMR mCRC were established previously in CheckMate -142, in which the dual immunotherapy combination demonstrated strong and durable anti-tumor activity among patients who had progressed after prior fluoropyrimidine-based combination chemotherapy," said Dana Walker, M.D., M.S.C.E., vice president, global program lead, gastrointestinal and genitourinary cancers, Bristol Myers Squibb. "Now, with these positive results from CheckMate -8HW, we have randomized data showing Opdivo plus Yervoy significantly improved PFS in the first line setting for patients with MSI-H/dMMR mCRC. These results further support the benefits of dual PD-1 and CTLA-4 inhibition, and demonstrate our continued commitment to pursue combination strategies that may help improve outcomes for patients with high unmet need."
CheckMate -8HW is a Phase 3 randomized, open-label trial evaluating Opdivo plus Yervoy compared to either Opdivo alone or investigator’s choice of chemotherapy in patients with MSI-H or dMMR mCRC. The dual primary endpoints of the trial are PFS per BICR for Opdivo plus Yervoy compared to investigator’s choice of chemotherapy in the first line setting and PFS per BICR for Opdivo plus Yervoy compared to Opdivo alone across all lines of therapy. The study is ongoing to assess the other dual primary endpoint of PFS in patients receiving Opdivo plus Yervoy compared to Opdivo alone, as well as secondary endpoints.
The company will complete a full evaluation of the available CheckMate -8HW data and work with investigators to share the results with the scientific community at an upcoming medical conference, as well as discuss with health authorities.
Bristol Myers Squibb thanks the patients and investigators involved in the CheckMate -8HW clinical trial.
About CheckMate -8HW
CheckMate -8HW is a Phase 3 randomized, open-label trial evaluating Opdivo plus Yervoy compared to Opdivo alone or investigator’s choice chemotherapy (mFOLFOX-6 or FOLFIRI with or without bevacizumab or cetuximab) in patients with microsatellite instability–high (MSI-H) or mismatch repair deficient (dMMR) metastatic colorectal cancer (mCRC).
Approximately 830 patients were randomized to receive either Opdivo monotherapy (Opdivo 240 mg Q2W for six doses, followed by Opdivo 480 mg Q4W), Opdivo plus Yervoy (Opdivo 240 mg plus Yervoy 1 mg/kg Q3W for four doses, followed by Opdivo 480 mg Q4W), or investigator’s choice of chemotherapy. The dual primary endpoints of the trial are progression-free survival (PFS) per blinded independent central review (BICR) for Opdivo plus Yervoy compared to investigator’s choice of chemotherapy in the first line setting and PFS per BICR for Opdivo plus Yervoy compared to Opdivo alone across all lines of therapy. The trial also includes several secondary safety and efficacy endpoints, including overall survival (OS).
The study is ongoing to assess the second dual primary endpoint of PFS in patients receiving Opdivo plus Yervoy compared to Opdivo alone across all lines of therapy, as well as secondary endpoints.
About dMMR or MSI-H Colorectal Cancer
Colorectal cancer (CRC) is cancer that develops in the colon or the rectum, which are part of the body’s digestive or gastrointestinal system. CRC is the third most commonly diagnosed cancer in the world. In 2020, it is estimated that there were approximately 1,931,000 new cases of the disease; it is the second leading cause of cancer-related deaths among men and women combined.
Mismatch repair deficiency (dMMR) occurs when the proteins that repair mismatch errors in DNA replication are missing or non-functional, leading to microsatellite instability-high (MSI-H) tumors. Approximately 5-7% of metastatic CRC patients have dMMR or MSI-H tumors; they are less likely to benefit from conventional chemotherapy and typically have a poor prognosis.