Update on immunologic therapy with anti-CTLA-4 antibodies in melanoma: identification of clinical and biological response patterns, immune-related adverse events, and their management

Katharina C Kaehler, Sarah Piel, Elisabeth Livingstone, Bastian Schilling, Axel Hauschild, Dirk Schadendorf
Seminars in Oncology 2010, 37 (5): 485-98
Immune-modifying monoclonal antibodies may induce or enhance the natural immune response against tumor cells. The complex interaction between antigen-presenting cells and T lymphocytes as an immune response is strongly affected by anti-CD152 (cytotoxic T-lymphocyte antigen-4, CTLA-4)-antibodies. However, specific CTLA-4 antibodies can block the CTLA-4 receptor and thus induce an unrestrained T-cell activation. To this stage, treatment of patients with metastatic melanoma with the CTLA-4 antibodies ipilimumab and tremelimumab has only been investigated within clinical trials. The results of a phase III trial in patients with advanced disease treated with ipilimumab alone or in combination with a peptide vaccination (gp100) recently presented at the 2010 annual meeting of the Ameircan Society of Clinical Oncology (ASCO) made groundbreaking news as ipilimumab was demonstrated to be the first drug in melanoma treatment to show a significant prolongation of survival time. Patients undergoing treatment with CTLA-4 antibodies may experience immune-related phenomena and adverse events (irAEs) that differ greatly from the well-known adverse events of cytotoxic drugs and which are due to the CTLA-4 antibodies' specific mode of action. This review gives a condensed overview on the mechanisms of action, an update on clinical data of the two CTLA-4 antibodies, ipilimumab and tremelimumab, and detailed recommendations for adverse event management strategies.

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