Study Maps 920 Chemicals Tied to Breast Cancer Biology

Scientists cataloged 920 substances with biological connections to breast cancer. Some produced mammary tumors in rodent research, while others interfered with signaling involving estrogen or progesterone. The resulting database, named BC-Chems, was compared with records covering consumer goods, food, water, pesticides, medicines and construction materials.

Consumer goods emerged as the largest mapped exposure source, with estimated exposure generally higher among women. Personal care products, scented items and household cleaners were frequent categories. Phthalates may be included under a general fragrance listing, while parabens are added to preserve products. These substances can appear across shampoos, lotions, nail polish, cleaning sprays and air fresheners, creating exposure through several parts of a normal routine.

BPA was also included because it is used in some plastics and can linings. The analysis treated food packaging and other food-contact materials as exposure pathways. Separately, recent research found that avoiding single-use plastic for a week reduced hormone-disrupting chemicals measured in the body. BC-Chems was designed to guide government and health authorities toward substances needing further examination, reflecting the role of manufacturing and supply chains alongside personal product choices.