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Article History

Received: 8 June 2024

Accepted: 6 November 2024

First Online: 9 November 2024

Declarations

:

: In this study, we used data from the hospital-based cancer registry, most of which were already publicly available. Some additional analyses were performed based on the approval of the institutional review board of NHO Shikoku Cancer Center (No: CO 2023–531) and were conducted in accordance with the Declaration of Helsinki. On the retrospective nature of the study, the need for written informed consent was waived by the institutional review board of NHO Shikoku Cancer Center.

: Not applicable.

: The authors declare no competing interests.