In Le Hong Ky (2010) study, the proportion of ampullary, distal common bile duct, and duodenal cancer were 88.2%, 5.9% and 5.9%, respectively.
Lê Hồng Kỳ (2010), gặp u bóng Vater 88,2%, u đoạn thấp OMC chiếm 5,9%, u tá tràng quanh bóng Vater chiếm 5,9%.