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Article History

Received: 15 February 2020

Accepted: 28 August 2020

First Online: 6 October 2020

Ethics approval and consent to participate

: All procedures in studies involving human participants were performed in accordance with the ethical standards of the institutional and/or national research committee and the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the National Cancer Center Institutional Review Board (2012–324) and the Institutional Review Board of each participating hospital. Informed consent was obtained from all individual participants included in the study.

: Not applicable.

: Koichi Goto has received a speaker honorarium fee from AstraZeneca, Bristol-Myers Squibb, ONO, Chugai, Eli Lilly, MSD, and Pfizer and research grants from Dainippon Sumitomo Pharma, MSD, Astellas, AstraZeneca, ONO, Kyowa Hakko Kirin, Daiichi Sankyo, TAIHO, Takeda, Chugai, Eli Lilly, Novartis, Nippon Boehringer lngelheim, Pfizer, Merck Serono, Bristol-Myers Squibb, Janssen Pharmaceutical, Ignyta, Loxo Oncology, Sysmex, Life Technologies Japan, RIKEN GENESIS, Oxonc. Takashi Seto has received a speaker honorarium fee from Astra Zeneca, Bristol-Myers Squibb, Chugai Pharmaceutical, Eli Lilly Japan, MDS, Nippon Boehringer Ingelheim, Ono Pharmaceutical, Pfizer Japan, Taiho Pharmaceutical, and Takeda Pharmaceutical and research grants from Astellas Pharma, Astra Zeneca, Chugai Pharmaceutical, Daiichi Sankyo, Eli Lilly Japan, Kissei Pharmaceutical, LOXO Oncology, Merck Serono, MDS, Nippon Behringer Ingelhim, Novartis Pharma, Pfizer Japan, Takeda Pharmaceutical. Masato Nishio has received a speaker honorarium fee from ONO, Bristol Myers Squibb, Pfizer, Chugai, Eli Lilly, TAIHO, AstraZeneca, Boehringer-ingelheim, MDS, Novartis, Daiichi Sankyo Healthcare, and Merck Sereno and research grants from MSD, Novartis, OnO, Chugai, Bristol Myers Squibb, TAIHO, Eli Lilly, AstraZeneca, Pfizer, and Astellas. Naoyuki Nogami has received a speaker honorarium fee from Pfizer, Chugai, Eli Lilly, TAIHO, Astra Zeneca, Kyowa Hakko Kirin, MDS, ONO. Hirotsugu Kenmotsu has received a speaker honorarium fee from ONO and AstraZeneca and research grants from Astra Zeneca, Boehringer Ingelheim, Chugai, and Daiichi Sankyo. Hiroyasu Kaneda has received a speaker honorarium fee from ONO Pharmaceutical Industries, Pfizer, Chugai, Eli Lilly, TAIHO, Astra Zeneca, and MDS.We have received financial support for the design of the study and collection, analysis and interpretation of the data in this study from Public Health Research Foundation (PHRF).