title: The prognostic value of breast cancer resistance protein (BCRB/ABCG2) expression in breast carcinomas.
abstract: In cancer, the level of expression of breast cancer resistance protein (BCRP/ABCG2) can vary depending on cell type. However, its precise role in breast cancer has been controversial. The aim of this study was to investigate the expression of ABCG2 in breast carcinomas and relate the results to the established prognostic factors. An immunohistochemical study was conducted on 200 breast carcinoma specimens using the avidin-biotin peroxidase method. ABCG2 was expressed in 77% of cases of invasive ductal carcinoma. There was a statistically significant correlation between ABCG2 expression and each of the tumor grade, clinical stage, lymph node metastasis, and HER2 immunostaining, but no such association with progesterone receptor (PR) and estrogen receptor (ER) status. Increased expression of ABCG2 in invasive ductal carcinoma cells and its statistically significant correlation with HER2 expression are strongly correlated with tumor progression, invasion, and metastasis in human breast cancer and indicates that ABCG2 can be used as a target for the development of novel therapies.
authors: Departments of Pathology, Faculty of Medicine, Assiut and Qassim Universities, Egypt and Kingdom of Saudi Arabia. ola67oh@yahoo.com
authors: Ola M
authors: OM
authors: Omran
mesh_terms: D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters / Q000032:analysis / Q000378:metabolism*; D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000378:metabolism* / Q000401:mortality; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000175:diagnosis* / Q000378:metabolism* / Q000401:mortality; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000032:analysis / Q000378:metabolism*; D011379:Prognosis; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000032:analysis / Q000378:metabolism*; D011960:Receptors, Estrogen / Q000032:analysis / Q000378:metabolism
chemical_list: D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters; D009363:Neoplasm Proteins; D018719:Erb-b2 Receptor Tyrosine Kinases; D011960:Receptors, Estrogen; C116614:ABCG2 protein, human; C508053:ERBB2 protein, human