Safety and Antitumor Activity of Anti–PD-1 Antibody, Nivolumab, in Patients With Platinum-Resistant Ovarian Cancer

Author:

Hamanishi Junzo1,Mandai Masaki1,Ikeda Takafumi1,Minami Manabu1,Kawaguchi Atsushi1,Murayama Toshinori1,Kanai Masashi1,Mori Yukiko1,Matsumoto Shigemi1,Chikuma Shunsuke1,Matsumura Noriomi1,Abiko Kaoru1,Baba Tsukasa1,Yamaguchi Ken1,Ueda Akihiko1,Hosoe Yuko1,Morita Satoshi1,Yokode Masayuki1,Shimizu Akira1,Honjo Tasuku1,Konishi Ikuo1

Affiliation:

1. Junzo Hamanishi, Masashi Kanai, Yukiko Mori, Shigemi Matsumoto, Shunsuke Chikuma, Noriomi Matsumura, Kaoru Abiko, Tsukasa Baba, Ken Yamaguchi, Akihiko Ueda, Yuko Hosoe, Tasuku Honjo, and Ikuo Konishi, Kyoto University Graduate School of Medicine, Kyoto, Japan; Masaki Mandai, Kinki University Faculty of Medicine, Osaka, Japan; and Takafumi Ikeda, Manabu Minami, Atsushi Kawaguchi, Toshinori Murayama, Satoshi Morita, Masayuki Yokode, and Akira Shimizu, Kyoto University Hospital, Kyoto, Japan.

Abstract

Purpose Programmed death-1 (PD-1), a coinhibitory immune signal receptor expressed in T cells, binds to PD-1 ligand and regulates antitumor immunity. Nivolumab is an anti–PD-1 antibody that blocks PD-1 signaling. We assessed the safety and antitumor activity of nivolumab in patients with platinum-resistant ovarian cancer. Patients and Methods Twenty patients with platinum-resistant ovarian cancer were treated with an intravenous infusion of nivolumab every 2 weeks at a dose of 1 or 3 mg/kg (constituting two 10-patient cohorts) from October 21, 2011. This phase II trial defined the primary end point as the best overall response. Patients received up to six cycles (four doses per cycle) of nivolumab treatment or received doses until disease progression occurred. Twenty nivolumab-treated patients were evaluated at the end of the trial on December 7, 2014. Results Grade 3 or 4 treatment-related adverse events occurred in eight (40%) of 20 patients. Two patients had severe adverse events. In the 20 patients in whom responses could be evaluated, the best overall response was 15%, which included two patients who had a durable complete response (in the 3-mg/kg cohort). The disease control rate in all 20 patients was 45%. The median progression-free survival time was 3.5 months (95% CI, 1.7 to 3.9 months), and the median overall survival time was 20.0 months (95% CI, 7.0 months to not reached) at study termination. Conclusion This study, to our knowledge, is the first to explore the effects of nivolumab against ovarian cancer. The encouraging safety and clinical efficacy of nivolumab in patients with platinum-resistant ovarian cancer indicate the merit of additional large-scale investigations (UMIN Clinical Trials Registry UMIN000005714).

Publisher

American Society of Clinical Oncology (ASCO)

Subject

Cancer Research,Oncology

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