A large randomized study published Sunday finds that 70% of women with early-stage invasive breast cancer no longer need chemotherapy, using the results of a commonly used genomic test. This practice-changing finding will spare a lot of unnecessary chemotherapy in patients with breast cancer.

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A large randomized study published Sunday finds that 70% of women with early-stage invasive breast cancer no longer need chemotherapy, using the results of a commonly used genomic test. This practice-changing finding will spare a lot of unnecessary chemotherapy in patients with breast cancer.