NCIt definition : Stage II includes: IIA: T3, N0, M0; IIB: T4a, N0, M0; IIC: T4b, N0, M0. T3: Tumor
invades through the muscularis propria into pericolorectal tissues. T4a: Tumor invades
through the visceral peritoneum (including gross perforation of the bowel through
tumor and continuous invasion of tumor through areas of inflammation to the surface
of the visceral peritoneum). T4b: Tumor directly invades or adheres to adjacent organs
or structures. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC
8th ed.);