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lüll Overcoming immunologic tolerance to melanoma: targeting CTLA-4 with tremelimumab (CP-675,206) Ribas AOncologist 2008[]; 13 Suppl 4 (ä): 10-5Cytotoxic T lymphocyte-associated antigen 4 (CTLA-4) blockade therapies have been evaluated in clinical trials and have shown promise as possible options for treating patients with cancer. One agent under investigation is tremelimumab (CP-675,206), a monoclonal antibody that has been demonstrated to be a safe and efficacious treatment in patients with malignant melanoma. Results of a phase I clinical trial suggested that a dose of 15 mg/kg of tremelimumab would be the maximum-tolerated dose, with the most common grade 3-4 toxicities being diarrhea and rash. Pharmacokinetic studies showed that the postinfusion plasma concentration and area under the plasma disposition curve both increased in an approximately proportional manner with dose. Studies also showed that tremelimumab has a low clearance (0.132 ml/h x kg), a small volume of distribution (81.2 ml/kg), and a long terminal-phase half-life (22.1 days). A pivotal phase II clinical trial assessing single-agent tremelimumab as second-line therapy in metastatic melanoma has completed accrual, with response rate as the primary endpoint. A pivotal phase III trial has also completed accrual; that study compared the overall survival of previously untreated patients receiving single-agent tremelimumab versus dacarbazine or temozolomide.|*Immunotherapy[MESH]|Antibodies, Monoclonal, Humanized[MESH]|Antibodies, Monoclonal/*therapeutic use[MESH]|Antigens, CD/*immunology[MESH]|CTLA-4 Antigen[MESH]|Clinical Trials, Phase I as Topic[MESH]|Clinical Trials, Phase II as Topic[MESH]|Humans[MESH]|Melanoma/*drug therapy/immunology[MESH] |