Which drug is a monoclonal antibody used in cancer immunotherapy targeting PD-1?
- Imatinib
- Pembrolizumab
- Methotrexate
- Cisplatin
Answer: Pembrolizumab
Pembrolizumab (Keytruda) blocks PD-1 checkpoint, enhancing T-cell attack on tumors. Represents paradigm shift to immunotherapy in oncology. Approved for multiple cancers. [[NCERT Biology Class 12, ICMR Reports]]