MSD’s Keytruda Wins FDA Approval for Platinum-Resistant Ovarian Cancer

MSD’s Keytruda Wins FDA Approval for Platinum-Resistant Ovarian Cancer

Merck & Co. (MSD, NYSE: MRK) announced that the U.S. Food and Drug Administration (FDA) has approved Keytruda (pembrolizumab) and Keytruda Qlex (pembrolizumab + berahyaluronidase alfa-pmph) in combination with paclitaxel (± bevacizumab) for platinum-resistant epithelial ovarian, fallopian tube, or primary peritoneal carcinoma in PD-L1+ (CPS ≥1) adults who have received 1-2 prior systemic regimens. The approval, based on Phase III KEYNOTE-B96 data, marks Keytruda’s entry into platinum-resistant ovarian cancer—a high-unmet-need setting with limited effective options.

Regulatory Milestone

ItemDetail
CompanyMerck, Sharp & Dohme (MSD; NYSE: MRK)
AgencyU.S. Food and Drug Administration (FDA)
AssetsKeytruda (pembrolizumab); Keytruda Qlex (pembrolizumab + hyaluronidase)
Combination+ paclitaxel (± bevacizumab)
IndicationPlatinum-resistant epithelial ovarian/fallopian tube/primary peritoneal carcinoma
BiomarkerPD-L1+ (CPS ≥1) by FDA-authorized test
Prior Therapy1-2 prior systemic treatment regimens

Clinical Evidence – KEYNOTE-B96 Phase III

EndpointKeytruda Regimen vs. PlaceboClinical Significance
Progression-Free Survival (PFS)28% risk reduction (HR=0.72; p=0.0014)Primary endpoint met; meaningful disease control
Overall Survival (OS)24% risk reduction (HR=0.76; p=0.0053)Statistically significant survival benefit; practice-changing
Patient PopulationPD-L1+ (CPS ≥1), platinum-resistant, 1-2 prior linesAddressable biomarker-defined population

Market Context & Strategic Positioning

FactorStrategic Analysis
Platinum-Resistant Ovarian Cancer Burden~80% of advanced ovarian cancer patients develop platinum resistance; median OS <12 months; no standard of care beyond single-agent chemotherapy
Keytruda Franchise Expansion30th+ FDA approval for Keytruda; reinforces PD-1 dominance in gynecologic malignancies (endometrial, cervical, now ovarian)
Keytruda Qlex DifferentiationSubcutaneous formulation (berahyaluronidase) enables office administration vs. IV infusion; convenience advantage in chronic treatment setting
Competitive LandscapeMirvetuximab soravtansine (ImmunoGen/ AbbVie) – FRα-targeted ADC approved 2022; Keytruda + chemotherapy offers PD-L1-selected, chemotherapy-backbone alternative
Biomarker StrategyCPS ≥1 cutoff (vs. tumor proportion score) broadens eligible population; companion diagnostic requirement ensures appropriate patient selection

Development & Commercial Outlook

PriorityExecution PlanTimeline
US LaunchGynecologic oncology specialist education; PD-L1 testing partnershipQ1-Q2 2026
Global ExpansionEMA, PMDA, NMPA submissions for platinum-resistant ovarian cancer2026-2027
Combination OptimizationExplore Keytruda + PARP inhibitors (niraparib) or anti-angiogenics in earlier linesInvestigational
Biomarker RefinementCPS ≥10 subset analysis for enhanced efficacy populationPost-approval

Forward‑Looking Statements
This brief contains forward‑looking statements regarding Keytruda commercial performance in platinum-resistant ovarian cancer, global regulatory expansion, and competitive dynamics with mirvetuximab soravtansine. Actual results may differ due to reimbursement negotiations, PD-L1 testing adoption rates, and physician preference for chemotherapy-backbone vs. targeted therapy approaches.-Fineline Info & Tech