Document is current

Article History

Received: 30 June 2025

Accepted: 23 March 2026

First Online: 20 April 2026

Declarations

:

: This study was approved by the Ethics Committee of each participating institute and was conducted in accordance with the principles of the Declaration of Helsinki. Written informed consent for future access and anonymous use of data was obtained from each patient. ・Center for Clinical Research. Yamaguchi University Hospital IRB No. H2019-123 ・St. Hill Hospital ethics committee No. R2-008 ・JCHO Tokuyama Central Hospital ethics committee No. K373-20200520 ・NHO Kanmon Medical Center ethics review committee No. R0309-3.

: No applicable.

: The authors declare no competing interests.

: YBC Group: Representative, Address, and Contact Information.YBC Group Representative: Hiroaki Nagano 1,5 ,YBC Group Adress, Contact Information: 1 Department of Gastroenterological, Breast and Endocrine Surgery, School of Medicine, Yamaguchi University, 1-1-1 Minamikogushi, Ube-shi, Yamaguchi-ken 755–8505, Japan.Tel: +81-836-22-2264.E-mail: ges_res@yamaguchi-u.ac.jp,Mari Nabeya 1,5 , Lisa Suyama 1,5 , Yuka Yano 5,6 , Gaku Fukamitsu 5,7 , Takashi Arata 5,8 , Yoshinari Maeda 5,9 , Michinori Iwamura 5,10 , Satoshi Onitsuka 5,11 , Noriko Maeda 1,5 , Yukiko Nagashima 5,12 , Masakazu Fujii 5,13 , Nobuki Matsunami 5,14 , Shigeru Yamamoto 5,15 , Kimikazu Hamano 5,16 , Hiroaki Nagano 1,5 , 1 Department of Gastroenterological, Breast and Endocrine Surgery, School of Medicine, Yamaguchi University, 1-1-1 Minamikogushi, Ube-shi, Yamaguchi-ken 755–8505, Japan. 6 Department of Surgery, Saiseikai Shimonoseki General Hospital, 8-5-1, Yasuokacyo, Shimonoseki-shi, Yamaguchi-ken 759–6603, Japan. 7 Fukamitsu Breast Clinic, 3-4-24, Kotobukicyo, Ube-shi, Yamaguchi-ken 755 − 0032, Japan. 8 Department of Surgery, National Hospital Organization Iwakuni Clinical Center, 1-1-1, atagocyo, Iwakuni-shi, Yamaguchi-ken 740 − 0037, Japan. 9 Department of Surgery, Shunan City Shinnanyo Hospital, 2-3-15, Mianomae, Shunan-shi, Yamaguchi-ken 746 − 0017, Japan. 10 Department of Surgery, Yamaguchi Rosai Hospital, 1315-4, Ooazaonoda, Sanyoonoda-shi, Yamaguchi-ken, 756 − 0095, Japan. 11 Department of Surgery, Yamaguchi Red Cross Hospital, 53-  1, Yahatababa, Yamaguchi-shi, Yamaguchi-ken 753 − 0092, Japan. 12 Department of Breast Surgery, NHO Kanmon Medical Center, 1-1, Cyofusotoura-cyo, Shimonoseki-shi, Yamaguchi-ken 752–8510, Japan. 13 Department of Breast Surgery, Yamaguchi Prefectural Grand Medical Center, 10077, Ooazaoosaki, Houfu-shi, Yamaguchi-ken 747–8511, Japan. 14 Department of Breast Surgery, Shuto General Hospital, 1000-1, Kogaisaku, Yanai-shi, Yamaguchi-ken 742 − 0032, Japan. 15 Department of Breast Surgery, JCHO Tokuyama Central Hospital, 1- 1, Kouda-cho, Syuunann-shi, Yamaguchi-ken 745–8522, Japan. 16 Department of Surgery and Clinical Science, School of Medicine, Yamaguchi University, 1-1-1, Minamikogushi, Ube-shi, Yamaguchi-ken 755–8505, Japan.