is chemotherapy necessary?
<answer> Chemotherapy may not be necessary for patients with stage I or stage II colorectal cancer, but is a common treatment option for patients with stage III or stage IV disease. <context> Chemotherapy for colorectal cancer. Chemotherapy drugs are designed to destroy cancer cells or impede their ability to grow and reproduce. Chemotherapy may not be necessary for patients with stage I or stage II colorectal cancer, but is a common treatment option for patients with stage III or stage IV disease. Chemotherapy for colorectal cancer may be given intravenously or in pill form.