Radiation can also be used to slow the spread of cancer and to offer relief from pain in conditions such as bone cancer. Chemotherapy - the use of chemicals or medications to treat cancer. The drugs used in chemotherapy interfere with cancer cells' ability to divide and reproduce. While the ultimate goal of chemotherapy is to destroy malignant cells without harming normal cells, selectivity is difficult because only subtle differences exist between normal and cancerous cells. Treatment may be deemed successful if normal cells are able to recover, and tumor cells are destroyed.
Chemotherapy is the main treatment for metastatic cancer.
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