The invention relates to the field of medicine and to the chemical and pharmaceutical industry, and concerns agents for treating breast cancer. Proposed is the use of 3-O-sulfamoyloxy-7β-methyl-D-homo-6-oxa-8α-estra-1,3,5(10)-triene-17a-one as an antitumor agent in monotherapy and adjuvant therapy for breast cancer, including triple-negative breast cancer, and a method for producing same.
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