Chemotherapy is a very common anti-tumor treatment. The duration of chemotherapy may depend on the regimen used as well as the stage of the tumor and the patient’s tolerance. The common chemotherapy regimens are 3-week regimens and 4-week regimens, that is, 3 weeks or 4 weeks between each chemotherapy treatment. Of course, the duration of each chemotherapy treatment is usually 3-5 days, but there are also chemotherapy regimens that require the first day, the eighth day, or there are weekly chemotherapy regimens, that is, chemotherapy drugs used once a week, which are available, depending on the pathology and tolerance of the patient. Some patients are not able to tolerate chemotherapy because of poor health, so the interval between chemotherapy courses may need to be increased. If there is a decline in white blood cells, anemia and other conditions, chemotherapy is also not possible, and it is necessary to raise white blood cells and blood replenishment treatment before chemotherapy.