There is no such thing as whether 14 days or 21 days of chemotherapy is better. The decision on the chemotherapy cycle should be made according to the specific condition and the patient’s tolerance level of the chemotherapy drugs, etc. The difference between 14 days and 21 days of chemotherapy lies in the difference in the interval between chemotherapy sessions. The difference between 14 days and 21 days of chemotherapy lies in the different intervals between chemotherapy treatments. 14 days of chemotherapy, that is, repeating the treatment at two-week intervals, is more common for single-drug regimens, with smaller dosages of drugs and quicker recovery of the body. While chemotherapy 21 days is a common chemotherapy cycle, usually used for the combination of two and more chemotherapy drugs, the dose is larger, generally need two weeks of chemotherapy toxicity to basically subside, and then after a week of recovery time to adjust the state. There is no better option, 14 days of chemotherapy caused by the side effects are more obvious, but the intensity of action is greater, for patients with a high risk of recurrence after surgery, should be based on the specific conditions of the targeted choice of chemotherapy cycle.