The cancer has spread through the muscular wall of the intestine or has extended to adjacent organs through the structures, but has not spread to lymph nodes . Dukes' B2 extends through the bowel wall; B3 involves adjacent structures.
Standard Treatment Surgical removal of the primary tumor , with or without adjuvant chemotherapy . Specific adjuvant therapy cannot be recommended for intermediate-risk tumors outside a clinical trial. But since a significant percentage of Stage II