Monoclonal Antibodies · Pharmacology

What is the primary target of the monoclonal antibody Ipilimumab in cancer immunotherapy?

  1. PD-1
  2. PD-L1
  3. CTLA-4
  4. CD40
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Correct answer: CTLA-4

Ipilimumab is a checkpoint inhibitor that blocks CTLA-4 (Cytotoxic T-Lymphocyte-Associated protein 4). Blocking this 'brake' on the immune system allows for enhanced T-cell activation and attack against cancer cells.

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