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 penetrates to the surface of the visceral peritoneum. T4b: Tumor directly invades or is adherent to other organs or structures. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 7th ed.) [from NCI]