title: Immunohistochemical expression of p53 protein in invasive breast carcinoma: clinicopathologic correlations.
abstract: The results of immunohistochemical expression of p53 protein in 106 invasive breast cancers were correlated with conventional pathologic prognostic parameters. Archival formalin-fixed, paraffin-embedded tissue sections of these cases were stained with a monoclonal antibody (Ab-2), raised against p53 protein using a peroxidase-labelled streptavidin biotin kit. Fifty-six (53%) showed positive nuclear staining; 31 were considered weakly, 21 moderately and 4 strongly positive. Forty-three (77%) of these positive cases stained less than 50% of the tumor cells, with a significant association between intensity and proportion of nuclei stained (p<0. 05). p53 staining also correlated with histologic grade (p<0.005) but not with tumor size nor clinical stage (p>0.05). The follow-up data did not reveal any statistically significant survival advantage for patients with p53 negative tumors.
authors.affiliation: Department of Pathology, Singapore General Hospital, S169608, Singapore.
authors.forename: P
authors.initials: P
authors.lastname: Tan
authors.forename: G
authors.initials: G
authors.lastname: Ho
authors.forename: C
authors.initials: C
authors.lastname: Ji
authors.forename: E
authors.initials: E
authors.lastname: Ng
authors.forename: F
authors.initials: F
authors.lastname: Gao
authors.forename: B
authors.initials: B
authors.lastname: Bay
mesh_terms: D014408:Biomarkers, Tumor; D001943:Breast Neoplasms / Q000378:metabolism* / Q000503:physiopathology; D002277:Carcinoma / Q000378:metabolism* / Q000503:physiopathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D011379:Prognosis; D016019:Survival Analysis; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis*
chemical_list: D014408:Biomarkers, Tumor; D016159:Tumor Suppressor Protein p53