title: Overexpression of cyclin D mRNA distinguishes invasive and in situ breast carcinomas from non-malignant lesions.
abstract: The elucidation of molecular alterations that occur during human breast cancer progression may contribute to the development of preventative strategies. Using in situ hybridizations on a cohort of 94 biopsy lesions, quantitatively increased cyclin D mRNA expression levels were observed in only 18% of benign lesions, which confer no or slightly increased breast cancer risk, and 18% of premalignant atypical ductal hyperplasias, which confer a four to fivefold increase in breast cancer risk. The transition to carcinoma was accompanied by frequent cyclin D mRNA overexpression in 76% of low-grade ductal carcinomas in situ, 87% of higher grade comedo ductal carcinomas in situ and 83% of infiltrating ductal breast carcinomas. The data identify a molecular event that may separate benign and premalignant human breast lesions from any form of breast carcinoma.
mesh_terms: D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D018270:Carcinoma, Ductal, Breast / Q000378:metabolism* / Q000473:pathology; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000378:metabolism* / Q000473:pathology; D015331:Cohort Studies; D019938:Cyclin D1; D016213:Cyclins / Q000235:genetics*; D005260:Female; D005348:Fibrocystic Breast Disease / Q000378:metabolism* / Q000473:pathology; D015870:Gene Expression; D006801:Humans; D009361:Neoplasm Invasiveness; D015513:Oncogene Proteins / Q000235:genetics*; D011230:Precancerous Conditions / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism*
chemical_list: D016213:Cyclins; D015513:Oncogene Proteins; D012333:RNA, Messenger; D019938:Cyclin D1