Regulatory approval

Published by the Health Canada. Approved

KEYTRUDA (pembrolizumab), in combination with trastuzumab, fluoropyrimidine- and platinum-containing chemotherapy,is indicated for the first-line treatment of adult patients with locally advanced unresectable or metastatic HER2-positive gastric or gastroesophageal junction (GEJ) adenocarcinoma, whose tumours express PD-L1 (Combined Positive Score [CPS] >=1) as determined by a validated test.

This is written in the approval document.

Citation

Merck Canada Inc. Keytruda (pembrolizumab) [product monograph]. Health Canada website. https://pdf.hres.ca/dpd_pm/00083378.PDF. Published January 2026. Accessed April 2026.

Therapeutic response

Precision oncology relationships for therapeutic response derived from this regulatory approval.

Organizations	Biomarkers	Cancer types	Therapies
HC (1)	HER2-positive, PD-L1 (CPS) >= 1	Adenocarcinoma of the Gastroesophageal Junction	Cisplatin, Fluorouracil, Pembrolizumab, Trastuzumab