Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstétrique et gynécologie du Canada : JOGC
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Breast cancer is reported to occur in from 1 in 3000 to 1 in 10,000 pregnancies worldwide. In the United States, 10% to 20% of breast cancers occur in women of childbearing age. Diagnosis and treatment of breast cancer during pregnancy present many additional challenges.