Pembrolizumab is approved for advanced endometrial carcinoma

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April 2022: Pembrolizumab (Keytruda, Merck) was approved by the Food and Drug Administration as a single agent for patients with advanced endometrial carcinoma that is microsatellite instability-high (MSI-H) or mismatch repair deficient (dMMR), as determined by an FDA-approved test, who have disease progression after prior systemic therapy in any setting and are not candidates for curative surgery or radiation.


Keytruda - Pembrolizumab

The VENTANA MMR RxDx Panel (Ventana Medical Systems / Roche Tissue Diagnostics) was also authorised by the FDA today as a companion diagnostic device for selecting patients with dMMR in solid tumours who are eligible for pembrolizumab treatment. The FoundationOne CDx (F1CDx, Foundation Medicine, Inc.) was previously approved by the FDA as a companion diagnostic device for identifying patients with MSI-H in solid tumours who are candidates for pembrolizumab treatment.

Efficacy was assessed in 90 patients with unresectable or metastatic MSI-H or dMMR endometrial cancer in Cohorts D and K of KEYNOTE-158 (NCT02628067), a multicenter, non-randomized, open-label, multi-cohort experiment. Polymerase chain reaction or immunohistochemistry were used to determine the MSI or MMR tumour status, respectively. Patients were given 200 mg of pembrolizumab intravenously every 3 weeks until they experienced unacceptable toxicity or disease progression. Patients who are treated with pembrolizumab and do not develop illness might be treated for up to 24 months.

The main efficacy outcome measures were the objective response rate (ORR) and duration of response (DoR), as determined by a blinded independent central review using RECIST v1.1, adjusted to follow a maximum of 10 target lesions and 5 target lesions per organ. The ORR was 46%. (95 percent CI: 35, 56). The median DoR was not met (2.9, 55.7+), with 68 percent of respondents responding for 12 months and 44 percent responding for 24 months.

Fatigue, musculoskeletal pain, rash, diarrhoea, pyrexia, cough, decreased appetite, pruritis, dyspnea, constipation, soreness, abdominal ache, nausea, and hypothyroidism were the most prevalent side events in patients (20 percent). Pneumonitis, colitis, hepatitis, endocrinopathies, nephritis, and skin adverse responses are all immune-mediated side effects related with pembrolizumab.

Pembrolizumab is given at a dose of 200 mg every 3 weeks or 400 mg every 6 weeks until disease progression or unacceptable toxicity occurs, which can last up to 24 months.


View full prescribing information for Keytruda.


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