How does Keytruda work?

Information reviewed July 24, 2026

Keytruda is a PD-1 checkpoint inhibitor. Many cancers evade the immune system by activating the PD-1 pathway. Keytruda blocks this pathway, allowing immune T-cells to recognize and destroy cancer cells.

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This information is for general reference and is not medical advice. Always consult a licensed healthcare professional about your treatment.

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