Fig. 1: Geographic overlap of environmental contamination and early onset breast cancer incidence.

A Map of EPA-designated Superfund sites in the continental United States, representing areas with confirmed hazardous contamination using data obtained from EnviroAtlas Data and B state-level incidence rates of early-onset breast cancer (diagnosed before age 50), highlighting regional variation using data obtained from20. Notably, areas with high Superfund site density overlap with states showing higher early-onset breast cancer incidence.