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Cytometric DNA analysis and prognostic biomarkers in breast carcinoma. Expression of P53 product in the different ploidy classes

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The aim of the study was to correlate the DNA Index (DI) and S-phase fraction (SPF) values determined by multiparametric flow cytometry in breast cancer (mainly T1 and T2 stages) with several clinico-pathologic variables and other biological parameters. For this purpose, a total of 136 breast cancers were submitted to flow cytometry and to several types of immunohistochemical analyses. Among clinico-pathologic data we considered pT, pN and grade and among immunohistochemical markers, hormonal receptors, P53, c-erbB-2 and MIB-1. We found that DNA aneuploidy was strongly correlated with high tumoral grade, absence of hormonal receptors, high proliferation, as shown by high MIB-1 ({\scriptstyle\geq}36%) and SPF values ({\scriptstyle\geq}13.3%), and P53 positivity. Grouping the tumours according to their DI values, we observed a relative significantly higher correlation of the near-triploid range carcinomas (DI 1.40–1.60) with immunohistochemical expression of P53 (p=0.0001). Near-triploid DI was also associated with a high proliferative activity, expressed both by SPF (p=0.0001) and MIB-1 reactivity (p=0.0001), high tumoral grade (p=0.0001) and presence of axillary metastases (p=0.03). These data suggest that DNA near-triploid tumours in breast cancer may have a more aggressive behaviour in comparison with other DI classes.
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Keywords: Ploidy

Document Type: Research Article

Affiliations: 1: Department of Anatomic Pathology, S. Chiara Hospital, Trento, Italy 2: Department of Oncology, S. Chiara Hospital, Trento, Italy

Publication date: 1997-01-01

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