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Hi Sana, I would like to give you a short background about cancer. Cancer is the uncontrolled growth of cells with malignant behavior such as invasion and metastasis, so chemotherapy is used because it affects cell division. Tumors with high growth factors are more sensitive to chemotherapy. Chemotherapy can cause depression of the immune system by decreasing the white blood cells, red BC, and platelets, and by paralysing the bone marrow, but these side effects can be improved by blood transfusion and bone marrow transplant. I think the positive therapeutic effect outweighs the immunosuppression. The other treatments are radiation therapy or surgery.
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