title: Co-Expression of p16, Ki67 and COX-2 Is Associated with Basal Phenotype in High-Grade Ductal Carcinoma In Situ of the Breast.
abstract: We assessed the co-expression of cell cycle-related biomarkers in a series of 121 consecutive cases of high-grade ductal carcinoma in situ (DCIS), pure or associated with invasive carcinoma, and their associations with the different immunoprofiles of DCIS. Cases were identified from the histopathology files of the Breast Pathology Laboratory, Federal University of Minas Gerais, Brazil, from 2003 to 2008. The expression of estrogen receptor, progesterone receptor, HER2 overexpression, cytokeratin 5, epidermal growth factor receptor 1, cyclooxygenase-2, p16 and Ki67 were assessed. Tumors were placed into five subgroups according to their immunohistochemical profile: luminal A, luminal B, HER2, basal-like and "not classified". We found that the basal phenotype was associated with a higher frequency of p16-positive cases (83%) and the luminal A phenotype showed a higher frequency of p16-negative cases (93%; p=0.000). The association of biomarkers p16(+)/Ki67(+)/COX2(+) was expressed in 02/06 cases (33.3%) of the basal phenotype but in only 01/70 cases (1.4%) of the luminal A phenotype (p=0.01). The co-expression of p16(+)/Ki67(+)/COX2(-) was associated with a basal phenotype (p=0.004). P16 expression, p16(+)/Ki67(+)/COX2(+) and p16(+)/Ki67(+)/COX2(-) co-expression showed significant associations with the basal phenotype and these profiles could be used to guide more aggressive treatment strategies in patients with high-grade DCIS.
authors.affiliation: Breast Pathology Laboratory, School of Medicine, Federal University of Minas Gerais, Brazil (AAP, DB, ADSS, HG)
authors.forename: Amanda Arantes
authors.initials: AA
authors.lastname: Perez
authors.affiliation: Breast Pathology Laboratory, School of Medicine, Federal University of Minas Gerais, Brazil (AAP, DB, ADSS, HG)
authors.forename: Débora
authors.initials: D
authors.lastname: Balabram
authors.affiliation: A.C. Camargo Cancer Hospital, São Paulo, Brazil (RMR)
authors.forename: Rafael Malagoli
authors.initials: RM
authors.lastname: Rocha
authors.affiliation: Breast Pathology Laboratory, School of Medicine, Federal University of Minas Gerais, Brazil (AAP, DB, ADSS, HG)
authors.forename: Átila
authors.initials: Á
authors.lastname: da Silva Souza
authors.affiliation: Breast Pathology Laboratory, School of Medicine, Federal University of Minas Gerais, Brazil (AAP, DB, ADSS, HG)
authors.forename: Helenice
authors.initials: H
authors.lastname: Gobbi
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis; D001940:Breast / Q000473:pathology*; D001943:Breast Neoplasms / Q000473:pathology*; D002285:Carcinoma, Intraductal, Noninfiltrating / Q000473:pathology*; D019941:Cyclin-Dependent Kinase Inhibitor p16 / Q000032:analysis*; D051546:Cyclooxygenase 2 / Q000032:analysis*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000032:analysis*; D008875:Middle Aged
chemical_list: D014408:Biomarkers, Tumor; D019941:Cyclin-Dependent Kinase Inhibitor p16; D019394:Ki-67 Antigen; D051546:Cyclooxygenase 2
keywords: biological markers; biomarkers; breast cancer; ductal carcinoma in situ