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If you have had surgery to remove the cancer, sometimes there may be cancerous cells in the bloodstream or elsewhere in the body (e.g. lymph nodes) and chemotherapy and/or radiation are beneficial helping to destroy those cells.
It depends on the type of cancer how long chemo and radiation would be administered. For breast cancer I had 6 rounds of Chemo over a 12 week period and then 30 rounds of radiation, given every day (except weekends).
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