• Weichao Bao, Xiaolin Ma, Yuan Xue, Xin Zou, and Ying Guo.
• School of Clinical Medicine, Shandong Second Medical University, Weifang, Shandong Province, China.
• Medicine (Baltimore). 2024 Oct 11; 103 (41): e40059e40059.

RationaleThe incidence of pregnancy-associated breast cancer (PABC) is relatively low, but it has been increasing in recent years. The onset of PABC causes serious harm to the fetus and the mother due to the unique physiological characteristics of pregnancy, which poses a particular challenge to clinicians. This article reports a case of pregnancy-associated triple-negative breast cancer and describes the patient characteristics and systematic treatment of this type of breast cancer.Patient ConcernsA 33-year-old woman was admitted to hospital with a left breast mass that had appeared more than a year earlier. She was a second-time pregnant woman with a single live intrauterine fetus at 23 + 4 weeks of gestation. During the examination of the left breast, a 6 by 8 cm sized mass can be observed on the upper outer quadrant.DiagnosisPregnancy-associated triple-negative breast cancer.InterventionThe patient underwent a breast ultrasound which showed a left breast mass and the diagnosis was confirmed by a puncture biopsy of the left breast mass. The pregnancy was terminated after multidisciplinary discussion, taking into account the wishes of the patient and her family. After termination of the pregnancy, all treatments were given according to the standard triple-negative breast cancer (TNBC) treatment protocol. The patient was treated with neoadjuvant chemotherapy with epirubicin in combination with docetaxel (TE) in cycles of 21 days. After 3 cycles of TE, a modified radical mastectomy for left breast cancer was performed, and the appropriate radiotherapy and chemotherapy treatments were carried out in sequence.OutcomesAfter the surgery, the disease-free survival for the patient was 3 months until local metastases were diagnosed. Thus the radiotherapy and chemotherapy were carried out, and then the patient was in good general condition with no recurrence or metastases.LessonsClinicians need more research into the diagnosis, treatment and prognosis of PABC. Improving the rate of early diagnosis and using standardized and individualized comprehensive treatment plans will minimize fetal damage and improve survival and quality of life for patients.Copyright © 2024 the Author(s). Published by Wolters Kluwer Health, Inc.

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