Genetic Test Impacts Chemo Choices In Surprising Ways

TIME

In the new era of personalized medicine, having more information on hand is considered the ideal situation for making more customized, and ideally, effective decisions about medical care.

And in a new study of breast cancer patients, researchers show that a relatively new genetic test for evaluating tumors is doing just that. It’s just that the test isn’t necessarily leading to the decisions that experts expected.

The Oncotype DX Breast Cancer Assay is a test approved by the U.S. Food and Drug Administration to help women decide how likely their breast cancer is to recur. The score, from zero to 100, is for women with breast tumors that have not spread to the lymph nodes. It places women on a scale of probability, based on an analysis of 21 genes in her tumor. Most doctors and patients use the score to decide, in part, whether the woman should receive chemotherapy…

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