Keytruda (pembrolizumab) is a medicine used to treat advanced melanoma, metastatic non-squamous NSCLC, recurrent or metastatic squamous cell carcinoma of the head and neck (HNSCC), recurrent classical Hodgkin lymphoma (cHL), locally advanced or metastatic urothelial carcinoma, solid tumors with the biomarkers MSI-H or dMMR, recurrent locally advanced or metastatic adenocarcinoma of the stomach or gastroesophageal junction, renal cell carcinoma, and triple-negative breast cancer.