Hata, Hironobu http://orcid.org/0000-0002-0077-7026
Imamachi, Kenji http://orcid.org/0000-0003-1090-3660
Ueda, Michihiro
Matsuzaka, Masashi http://orcid.org/0000-0002-8199-3037
Hiraga, Hiroaki
Osanai, Toshihisa http://orcid.org/0000-0003-0220-0535
Harabayashi, Toru
Fujimoto, Katsuya
Oizumi, Satoshi
Takahashi, Masato http://orcid.org/0000-0002-6641-9598
Yoshikawa, Kazuhito
Sato, Jun
Yamazaki, Yutaka
Kitagawa, Yoshimasa
Article History
Received: 20 July 2021
Accepted: 13 January 2022
First Online: 3 February 2022
Declarations
:
: All procedures performed on human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This single-center, retrospective, observational study protocol and patient information were approved by the Hokkaido Cancer Center Hospital Ethics Review Board (clinical study number 02–10), and informed consent was waived by this board because of the retrospective design of the study. Permission to access raw data from hospital cancer registries for life prognosis survey was also granted by the ethics review board.
: Not applicable
: The authors declare no competing interests.