title: The role of BRCA1 in the cellular response to chemotherapy.
abstract: Germline mutations of the BRCA1 gene account for approximately 5% of breast and ovarian cancer cases, and lower than normal BRCA1 expression or function may be an important contributing factor in sporadic cancers. The major role of BRCA1 is to respond to DNA damage by participating in cellular pathways for DNA repair, mRNA transcription, cell cycle regulation, and protein ubiquitination. Because most chemotherapeutic agents function by directly or indirectly damaging DNA, the role of BRCA1 as a regulator of chemotherapy-induced DNA damage has been the subject of an increasing number of investigations. We review published preclinical and clinical evidence that the level of BRCA1 function in an individual patient's tumor can guide the choice of chemotherapeutic agents for breast and ovarian cancer. We conclude that a loss of BRCA1 function is associated with sensitivity to DNA-damaging chemotherapy and may also be associated with resistance to spindle poisons. We recommend that prospective clinical studies investigating the role of BRCA1 in the response to chemotherapy be conducted.
authors.affiliation: Department of Oncology, Cancer Research Centre, The Queen's University of Belfast, Northern Ireland.
authors.forename: Richard D
authors.initials: RD
authors.lastname: Kennedy
authors.forename: Jennifer E
authors.initials: JE
authors.lastname: Quinn
authors.forename: Paul B
authors.initials: PB
authors.lastname: Mullan
authors.forename: Patrick G
authors.initials: PG
authors.lastname: Johnston
authors.forename: D Paul
authors.initials: DP
authors.lastname: Harkin
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D014408:Biomarkers, Tumor / Q000235:genetics; D001943:Breast Neoplasms / Q000188:drug therapy / Q000235:genetics*; D018797:Cell Cycle Proteins / Q000235:genetics; D004249:DNA Damage / Q000187:drug effects*; D004260:DNA Repair / Q000187:drug effects; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D019398:Genes, BRCA1 / Q000187:drug effects*; D005819:Genetic Markers; D018095:Germ-Line Mutation / Q000187:drug effects; D006801:Humans; D009153:Mutagens / Q000633:toxicity; D010051:Ovarian Neoplasms / Q000188:drug therapy / Q000235:genetics*; D011237:Predictive Value of Tests; D012333:RNA, Messenger / Q000187:drug effects; D012334:RNA, Neoplasm / Q000187:drug effects; D012107:Research Design; D012189:Retrospective Studies; D008941:Spindle Apparatus / Q000187:drug effects; D014158:Transcription, Genetic / Q000187:drug effects; D014452:Ubiquitins / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D014408:Biomarkers, Tumor; D018797:Cell Cycle Proteins; D005819:Genetic Markers; D009153:Mutagens; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D014452:Ubiquitins