Phase II study of ipilimumab monotherapy in Japanese patients with advanced melanoma

N Yamazaki, Y Kiyohara, H Uhara, S Fukushima, H Uchi, N Shibagaki, A Tsutsumida, S Yoshikawa, R Okuyama, Y Ito, T Tokudome, N Yamazaki, Y Kiyohara, H Uhara, S Fukushima, H Uchi, N Shibagaki, A Tsutsumida, S Yoshikawa, R Okuyama, Y Ito, T Tokudome

Abstract

Purpose: Ipilimumab is designed to block cytotoxic T-lymphocyte antigen-4 to augment antitumor T cell responses. In studies of predominantly Caucasian patients with advanced melanoma, ipilimumab was associated with durable response, long-term survival benefit, and a manageable safety profile. This phase II study assessed the safety of ipilimumab in Japanese patients with unresectable stage III or IV melanoma.

Methods: Patients received ipilimumab 3 mg/kg every 3 weeks for four doses. The database lock for the original analysis was in August 2014. Overall survival, progression-free survival, and data on deaths were based on an updated, follow-up analysis (database lock April 2015).

Results: Data are reported from 20 patients. Fifteen patients (75 %) received all four doses of ipilimumab during induction. Twelve patients (60 %) had at least one drug-related adverse event (AE), and no patients discontinued due to a drug-related AE. There were no deaths related to study drug. The most common drug-related AEs were rash (n = 7), pyrexia (n = 3), increased aspartate aminotransferase (AST; n = 3), and increased alanine aminotransferase (ALT; n = 3). Twelve patients (60 %) reported immune-related AEs (irAEs); most frequent were skin (n = 9) and liver (n = 3) disorders. Grade 3 irAEs were ALT and AST elevation (n = 2) and diabetes mellitus (n = 1). Two patients had a partial response and two had stable disease, yielding a 20 % disease control rate. Median overall survival and progression-free survival were 8.71 and 2.74 months, respectively.

Conclusion: Ipilimumab 3 mg/kg had a manageable AE profile in this Japanese patient population with clinical outcomes similar to that in Caucasian patients. CLINICALTRIALS.

Gov identifier: NCT01990859.

Keywords: Immune-checkpoint inhibitor; Ipilimumab; Japanese patients; Melanoma; Phase II study.

Figures

Fig. 1
Fig. 1
Study design. BL baseline, D day, IPI ipilimumab, PD progressive disease, q3wk every 3 weeks, wk week. aPatients with PD, intolerability toxicity or who discontinued study treatment during induction entered the follow-up phase and were followed for safety and survival for ≥1 year after the last patient’s first treatment
Fig. 2
Fig. 2
Kaplan–Meier curves for overall survival (a) and progression-free survival (b)

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Source: PubMed

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