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Ref Type | Journal Article | ||||||||||||
PMID | (30787022) | ||||||||||||
Authors | Marcus L, Lemery SJ, Keegan P, Pazdur R | ||||||||||||
Title | FDA Approval Summary: Pembrolizumab for the Treatment of Microsatellite Instability-High Solid Tumors. | ||||||||||||
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Abstract Text | The FDA approved pembrolizumab on May 23, 2017, for the treatment of adult and pediatric patients with unresectable or metastatic, microsatellite instability-high (MSI-H), or mismatch repair deficient (dMMR) solid tumors that have progressed following prior treatment and who have no satisfactory alternative treatment options and for the treatment of unresectable or metastatic MSI-H or dMMR colorectal cancer that has progressed following treatment with a fluoropyrimidine, oxaliplatin, and irinotecan. The FDA granted the approval based on an understanding of the biology of MSI-H/dMMR across different tumors along with the clinically important effects on overall response rate (ORR) observed in patients who were enrolled in 1 of 5 single-arm clinical trials. The ORR was 39.6% among 149 patients with 15 different tumor types (95% confidence interval, 31.7-47.9), with a 7% complete response rate. The duration of response ranged from 1.6+ months to 22.7+ months, with 78% of responses lasting ≥6 months. Overall, the adverse event profile of pembrolizumab was similar to the adverse event profile observed across prior trials that supported the approval of pembrolizumab in other indications. This approval of pembrolizumab is the first time that the FDA has approved a cancer treatment for an indication based on a common biomarker rather than the primary site of origin. |
Molecular Profile | Treatment Approach |
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MLH1 negative | PD-L1/PD-1 antibody |
MSH6 negative | PD-L1/PD-1 antibody |
Gene Name | Source | Synonyms | Protein Domains | Gene Description | Gene Role |
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Therapy Name | Drugs | Efficacy Evidence | Clinical Trials |
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Drug Name | Trade Name | Synonyms | Drug Classes | Drug Description |
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Gene | Variant | Impact | Protein Effect | Variant Description | Associated with drug Resistance |
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Molecular Profile | Indication/Tumor Type | Response Type | Therapy Name | Approval Status | Evidence Type | Efficacy Evidence | References |
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MLH1 negative | Advanced Solid Tumor | sensitive | Pembrolizumab | FDA approved | Actionable | In a combined analysis of 5 trials that supported FDA approval, Keytruda (pembrolizumab) therapy resulted in an objective response rate of 39.6% (59/149) in advanced solid tumor patients with high levels of microsatellite instability (MSI-H) or deficient mismatch repair (dMMR, often defined by the loss of MLH1, PMS2, MSH2, or MSH6 expression by IHC) (PMID: 30787022; NCT01876511, NCT02460198, NCT01848834, NCT02054806, NCT02628067). | detail... 30787022 |
MSH6 negative | Advanced Solid Tumor | sensitive | Pembrolizumab | FDA approved | Actionable | In a combined analysis of 5 trials that supported FDA approval, Keytruda (pembrolizumab) therapy resulted in an objective response rate of 39.6% (59/149) in advanced solid tumor patients with high levels of microsatellite instability (MSI-H) or deficient mismatch repair (dMMR, often defined by the loss of MLH1, PMS2, MSH2, or MSH6 expression by IHC) (PMID: 30787022; NCT01876511, NCT02460198, NCT01848834, NCT02054806, NCT02628067). | detail... 30787022 |