Phase I/II study of ipilimumab for patients with metastatic melanoma

Jeffrey S. Weber, Steven O'Day, Walter Urba, John Powderly, Geoff Nichol, Michael Yellin, Jolie Snively, Evan Hersh

Research output: Contribution to journalArticlepeer-review

396 Scopus citations


Purpose: The primary objective of this phase I/II study was to determine the safety and pharmacokinetic profile of either transfectoma- or a hybridoma-derived ipilimumab. Secondary objectives included determination of a maximum-tolerated dose and assessment of clinical activity. Patients and Methods: Eighty-eight patients with unresectable stage III or IV melanoma with at least one measurable lesion were treated. Mean age was 59 years, with 65% male and 35% female patients, and 79% of patients had received prior systemic therapy. Single doses of ipilimumab up to 20 mg/kg (group A, single dose), multiple doses up to 5 mg/kg (group A, multiple dose), and multiple doses up to 10 mg/kg (group B) were administered. Results: Single dosing up to 20 mg/kg of transfectoma antibody was well tolerated, as were multiple doses up to 10 mg/kg without a maximum-tolerated dose. In group B, dose-limiting toxicity was seen in six of 23 melanoma patients. Grade 3 or 4 immune-related adverse events (irAEs) were observed in 14% of patients (12 of 88 patients), and grade 1 or 2 irAEs were seen in an additional 58%. The half-life of ipilimumab was 359 hours. In group B, there was one partial response (23+ months), one complete response (21+ months), and seven patients with stable disease (SD), for a disease control rate of 39%. Two patients in group B with SD had slow, steady decline in tumor burden that was ongoing at 1 year of observation. Conclusion: Ipilimumab has activity in patients with metastatic melanoma. Late responses were observed in patients with prolonged SD.

Original languageEnglish (US)
Pages (from-to)5950-5956
Number of pages7
JournalJournal of Clinical Oncology
Issue number36
StatePublished - Dec 20 2008
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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