title: Cyclins and breast cancer.
abstract: The D-type and E-type cyclins control the G(1) to S phase transition during normal cell cycle progression and are critical components of steroid- and growth factor-induced mitogenesis in breast epithelial cells. Mammary epithelial cell-specific overexpression of these genes leads to mammary carcinoma, while in cyclin D1-deficient mice mammary gland development is arrested prior to lobuloalveolar development. Cyclin D1 null mice are resistant to mammary carcinoma induced by the neu and ras oncogenes, indicating an essential role for cyclin D1 in the development of some mammary cancers. Cyclin D1 and E1 are commonly overexpressed in primary breast cancer, with some evidence of an association with an adverse patient outcome. This observation may result in part from their ability to confer resistance to endocrine therapies. The functional consequences of cyclin E overexpression in breast cancer are likely related to its role in cell cycle progression, whereas that of cyclin D1 may also be a consequence of a more recently defined role in transcriptional regulation.
authors.affiliation: Cancer Research Program, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, Sydney, Australia. r.sutherland@garvan.org.au
authors.forename: Robert L
authors.initials: RL
authors.lastname: Sutherland
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Musgrove
mesh_terms: D000818:Animals; D018931:Antineoplastic Agents, Hormonal / Q000494:pharmacology; D001943:Breast Neoplasms / Q000235:genetics* / Q000503:physiopathology*; D002277:Carcinoma / Q000235:genetics / Q000503:physiopathology*; D002453:Cell Cycle / Q000502:physiology*; D049109:Cell Proliferation; D002471:Cell Transformation, Neoplastic; D019938:Cyclin D1 / Q000096:biosynthesis* / Q000494:pharmacology*; D019927:Cyclin E / Q000096:biosynthesis* / Q000494:pharmacology*; D004195:Disease Models, Animal; D019008:Drug Resistance, Neoplasm; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D015674:Mammary Neoplasms, Animal / Q000235:genetics* / Q000503:physiopathology*; D051379:Mice; D015513:Oncogene Proteins / Q000096:biosynthesis* / Q000494:pharmacology*
chemical_list: D018931:Antineoplastic Agents, Hormonal; C475820:CCNE1 protein, human; D019927:Cyclin E; D015513:Oncogene Proteins; D019938:Cyclin D1