A structured review of the associations between breast cancer and exposures to selected organic solvents

Our objective was to identify published, peer-reviewed, epidemiological studies that estimated associations between the risk of developing or dying from malignant breast cancer and past exposure to selected organic solvents with reactive metabolites, to delineate the methods used and to synthesize the results. We undertook a structured review of case-control and cohort studies used to investigate breast cancer risk and exposure to selected organic solvents that produce reactive metabolites in the body. We used SCOPUS, MEDLINE (Ovid) and Web of Science databases from 1966 to December 31, 2023 to identify epidemiological studies that estimated associations between the risk of developing or dying from malignant breast cancer and past exposure to selected organic solvents with reactive metabolites and organic solvents combined as a group. We described essential methodological characteristics of the 35 studies and presented quantitative results by individual solvent and other characteristics. We did not find compelling evidence that any of the selected organic solvents are implicated in the etiology of breast cancer. As millions of workers are exposed to organic solvents, this topic necessitates further investigation. Future research should focus on elucidating organic solvents that may contribute to the burden of breast cancer.