Stage IB includes: (T1b, N0, M0); (T2, N0, M0). T1b: Tumor invading beyond the sphincter of Oddi (perisphincteric invasion) and/or into the duodenal submucosa. T2: Tumor invading into the muscularis propria of the duodenum. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.) [from
NCI]