Stage IIIB includes: (T1, N1, M0); (T2, N1, M0); (T3, N1, M0); (T4, N1, M0). T1: Tumor invading the lamina propria or submucosa and measuring 2 cm or less. T2: Tumor invading the muscularis propria or measuring more than 2 cm with invasion of the lamina propria or submucosa. T3: Tumor invading through the muscularis propria into subserosal tissue without penetration of overlying serosa. T4: Tumor invading the visceral peritoneum (serosa) or other organs or adjacent structures. N1: Regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.) [from NCI]