Received: 28 April 2020
Accepted: 3 November 2020
First Online: 16 November 2020
Ethics approval and consent to participate
: Study protocol was approved by the institutional review board (National Cancer Center IRB, ref. 2019-137). Informed consent requirement was waived due to the study's observational retrospective design, with an opt-out opportunity provided at the institution's website.
: Not applicable.
: DK reports receiving honoraria from Takeda, Chugai, Lilly, Merck Serono, Taiho, Sysmex outside of this work. AK reports receiving research funding from Taiho, Ono, Sumitomo Dainippon and MSD outside of this work. TY reports receiving research funding from Novartis, MSD, Sumitomo Dainippon, Chugai, Sanofi, Daiichi-Sankyo, Parexel, Ono, Glaxo Smith Kline, and Boehringer Ingelheim. KS reports paid consulting or advisory roles for Astellas, Lilly, Bristol-Myers Squibb, Takeda, Pfizer, Ono, MSD, Taiho, Novartis, Abbie, and Glaxo Smith Kline; honoraria from Novartis, Abbie, and Yakult; and research funding from Astellas, Lilly, Ono, Sumitomo Dainippon, Daiichi Sankyo, Taiho, Chugai, MSD and Medi Science.