Breast cancer and pregnancy: how safe is trastuzumab?

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Abstract

Background.

A 29-year-old woman was diagnosed with lymph-node-positive, steroid-hormone-receptor-negative and HER2/neu-positive breast cancer. She underwent surgery followed by cyclophosphamide, epirubicin, and 5-fluorouracil chemotherapy, and received radiotherapy followed by trastuzumab therapy for 1 year. During the tenth month of trastuzumab therapy, the patient reported a missed period and had a positive pregnancy test.

Investigations.

Physical examination, pregnancy test, echocardiography.

Diagnosis.

Unintended pregnancy during adjuvant trastuzumab therapy.

Management.

Cessation of trastuzumab and close monitoring of mother and fetus during pregnancy.

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