Do oestrogens induce chromosome specific aneuploidy in vitro, similar to the pattern of aneuploidy seen in breast cancer?

Abstract The study was concerned with investigating the specific effects of non-DNA reactive oestrogens at low “biologically relevant” doses and the causative role they may play in breast cancer through inducing aneuploidy. A review of previous studies identified a non-random pattern of aneuploidyseen in breast cancers. This information was used to select those chromosomes that undergo copy number changes in breast cancer and chromosomes that appear stable. A panel of centromericspecific probes were selected and centromericspecific fluorescence in situ hybridisation (FISH) was carried out on the human lymphoblastoid cell line, AHH-1, which had been pre-treated with the chemical aneugens17-β oestradiol, diethylstilbestrol(DES) and bisphenol-A (BP-A). The results suggest that oestrogens may play a causative role in breast cancer by inducing a specific patternof aneuploidysimilar to that seen in breast carcinomas. 17-β oestradiol appears to induce changes most similar to those seen in breast tumours, BP-A induces the same pattern but at a lower frequency and DES appears to be less chromosome specific in its act.