The decision to give chemotherapy for Colorectal cancer depends on two factors.
1) The Stage of cancer and 2) the fitness level of the patient.
In stage 1 cancer, chemotherapy is not given.
Some patients with Stage 2 and most patients with stage 3 colorectal cancer need chemotherapy after surgery.
Stage 4 Colorectal cancer also is treated with Chemotherapy and Surgery in selected cases.
No matter what stage, patient fitness plays an important role in decision-making about chemotherapy.