Treatment of breast cancer cells with inhibitors of cyclin D1 and CDK4/6 (Flavopiridol/PD0332991), currently in clinical trials, mimicked the effects observed with siRNA treatment.
Here, we investigate the prognostic significance of CCND1 and EMSY amplification in a large series of breast carcinomas and in BRCA1 and BRCA2 mutation positive breast cancers.
Cyclin D1 gene amplification and chromosome 11 aneusomy were investigated using fluorescence in situ hybridization whereas cyclin D1, PgR, HER-2, Bcl2, p53, and Ki-67 expressions were analyzed by immunohistochemistry in 121 stage I or II breast cancer patients uniformly treated with cyclophosphamide/metotrexate/5-fluorouracil-based chemotherapy.