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PHILADELPHIA (CBS) — The results of the largest breast cancer treatment study ever done revealed surprising information about chemotherapy treatment.

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According to researchers, women with the most common form of the disease called invasive ductal carcinoma, can actually skip chemotherapy without hurting their chances of beating the cancer.

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The results are expected to affect up to 70,000 patients a year in the United States.

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The results were published by the New England Journal of Medicine.