Researchers are looking for ways to precisely predict which cancer patients can avoid unneeded treatment to cut down on harmful side effects and unnecessary costs.
Many colon cancer patients are given chemotherapy after surgery, even though they may be cured. The drugs can come with side effects such as nausea, anemia and memory problems.
Their care was guided by the blood test: If it showed no signs of remaining cancer, the patients did not get chemotherapy. Meanwhile, doctors made chemo decisions for the rest of the patients in the usual way, guided by analysis of the tumor and nearby tissue. After surgery, the women took hormone-blocking pills, a standard treatment for this type of cancer, but they did not get radiation treatment.
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