Which chemotherapy for patients with colorectal cancer

Cancer treatment should aim to cure patients, but so far not every case can be cured. Chemotherapy can not be cured, nor can effectively prolong survival and improve quality of life of patients, the blind will increase the suffering of patients with chemotherapy, and even speed up the patient's death. Therefore, it is necessary to grasp the indication of chemotherapy.Which chemotherapy for colorectal cancer:
(1) large colon cancer adjuvant chemotherapy;
(2) cases of colorectal cancer recurrence;
(3) of the colorectal cancer patients for chemotherapy? Patients with advanced colorectal cancer, loss of the surgical palliative chemotherapy;
(4) Karnofsky score above 60 points;
(5) expected survival of at least 3 months;
(6) of chemotherapy for colorectal cancer? Younger than 65 years of age.