In vitro fertilization impact on the risk of breast cancer.

Breast cancer, with its increasing incidence and high mortality rates, remains a major global health challenge, significantly impacting individuals, families, and societies. Understanding the multifactorial risk factors contributing to its development is crucial for effective prevention and management. Hormonal factors play a significant role in breast cancer development. Given that ovarian steroid hormones influence breast function, any gonadotropin hormone or fertility drug that stimulates ovulation may also impact breast tissue. Contrary to the findings of studies with smaller sample sizes, concerns have emerged regarding the potential increased risk of breast cancer following in vitro fertilization (IVF) treatments. This article explores the potential risk of breast cancer associated with hormonal cycles during IVF, supported by a literature review and a case study conducted in a tertiary hospital in Bucharest, Romania. The case involves a 38-year-old patient with a history of hormonally treated endometriosis and five IVF cycles, who presented for mammographic and ultrasound screening. The screening revealed multicentric and multifocal BIRADS-5 lesions, with histopathological and immunohistochemical analysis confirming invasive breast carcinoma of no special type with ductal carcinoma in situ, HER2 positive (3+), estrogen receptor and progesterone receptor negative, and a Ki-67 proliferation index of 50%.