TABLE 3.

Early gallbladder cancer staging

AJCC stage 30	Stage grouping	Description	Surgical intervention 31
0	Tis	Malignancy confined to epithelium	Laparoscopic cholecystectomy
I	T1a	Lamina propria invaded by malignant cells	Laparoscopic cholecystectomy
I	T1b	Tumor cells present in but not through the muscularis propria	Radical cholecystectomy or re‐resection (unclear survival benefits) 11 , 12 , 13 , 18 , 19 , 20
IIA	T2a	Perimuscular mass present on the peritoneal side of the gallbladder	Radical cholecystectomy or re‐resection (unclear survival benefits) 18 , 19 , 20 , 32
IIB	T2b	Perimuscular mass present on the hepatic side of the gallbladder	Radical cholecystectomy or re‐resection 18 , 19 , 20 , 32