Originally published as JCO Early Release 10.1200/JCO.2005.06.205 on August 8 2005

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Autoimmunity Correlates With Tumor Regression in Patients With Metastatic Melanoma Treated With Anti–Cytotoxic T-Lymphocyte Antigen-4

From the Surgery Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD; and Medarex Inc, Princeton, NJ

Address reprint requests to Steven A. Rosenberg, MD, PhD, Surgery Branch, National Cancer Institute, National Institutes of Health, CRC, Room 3W-3940, 10 Center Dr, Bethesda, MD 20892-1201; e-mail: sar{at}nih.gov

PURPOSE: Previously, we reported our experience treating 14 patients with metastatic melanoma using a fully human antibody to cytotoxic T-lymphocyte antigen-4 (anti–CTLA-4) in conjunction with peptide vaccination. We have now treated 56 patients to evaluate two different dose schedules of anti–CTLA-4 and to explore the relationship between autoimmunity and tumor regression.

PATIENTS AND METHODS: A total of 56 patients with progressive stage IV melanoma were enrolled onto the study. All had Karnofsky performance status 60% with no prior history of autoimmunity. Twenty-nine patients received 3 mg/kg anti–CTLA-4 every 3 weeks, whereas 27 received 3 mg/kg as their initial dose with subsequent doses reduced to 1 mg/kg every 3 weeks. In both cohorts patients received concomitant vaccination with two modified HLA-A*0201-restricted peptides from the gp100 melanoma-associated antigen, gp100:209-217(210M) and gp100:280-288(288V).

RESULTS: Two patients achieved a complete response (ongoing at 30 and 31 months, respectively) and five patients achieved a partial response (durations of 4, 6, 25+, 26+, and 34+ months, respectively), for an overall objective response rate of 13%. Tumor regression was seen in lung, liver, brain, lymph nodes, and subcutaneous sites. Of 14 patients with grade 3/4 autoimmune toxicity, five (36%) experienced a clinical response compared with only two responses in the 42 patients (5%) with no autoimmune toxicity (P = .008). There were no significant differences in response rate or toxicity between the two dose schedules.

CONCLUSION: Administration of anti–CTLA-4 monoclonal antibody plus peptide vaccination can cause durable objective responses, which correlate with the induction of autoimmunity, in patients with metastatic melanoma.

Authors' disclosures of potential conflicts of interest are found at the end of this article.

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