Breast cancer tumor make-up changes through the course of disease

New research has found that breast cancer tumors change their hormonal status throughout the course of disease, whereas the decision about the most effective treatment for the patient is usually only based on one biopsy of the primary tumor. For some patients, biopsy verifications of any relapse may completely change their clinical management, according to the first sizable study to look at changes in tumors in multiple relapses in breast cancer patients.

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