1. Japan Pancreas Society. General rules for the study of pancreatic cancer. 7th ed. Tokyo: Kanehara & Co., Ltd.; 2020. ((in Japanese)).
2. Egawa S, Toma H, Ohigashi H, et al. Japan pancreatic cancer registry; 30th year anniversary: Japan pancreas society. Pancreas. 2012;41:985–92.
3. Yabuki H, Ebata H, Matsuda H, et al. A case of 3-year survival after total pancreatic resection of a pancreatic cancer complicated with pancreatic stone. J Biliary Tract Pancreas. 1990;11:1225–30 ((in Japanese)).
4. Yamano M, Yasuda A, Watanabe H, et al. Diagnosis of pancreatic cancer progression from pathology–gross versus histological progression. J Gastroenterol Imaging. 1999;1:319–30 ((in Japanese)).
5. Shirakawa R, Nakano A, Amano K, et al. A case of subclinical pancreatic cancer with a high serum CA19-9 level and vertebral involvement, with primary site revealed at autopsy. J Shimane Med Assoc. 2000;20:64–9 ((in Japanese)).