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Expression Of Nuclear Poly(Adenosine Diphosphate-Ribose) Polymerase In BRCA 1 And BRCA 2 Deficient Breast Cancer | 3122
ISSN: 2161-0681
Journal of Clinical & Experimental Pathology
Open Access
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Molecular mechanisms of DNA damage and repair and factors interfering with it have been subject of numerous studies in
the last decades. BRCA1 and BRCA2 associated breast and ovarian cancer have already been well established as a proof-of-
concept for synthetic lethality by Poly(ADP-ribose) polymerase (PARP) inhibition that refers to the inability of BRCA-deficient
cells to repair double strand breaks that emerge from single strand breaks in case of PARP inhibition of base excision repair. The
aim of our study was to investigate immunohistochemical expression of PARP in breast cancers from patients with deleterious
mutations in the BRCA1- (n = 67) or BRCA2-mutated (n = 29) gene compared to a cohort of sporadic breast cancers (n = 54). An
immunostaining score ranging from 0 to 12 was calculated for nuclear PARP (nPARP). In parallel, stained slides were digitalized
and evaluated independently by automated image analysis. nPARP staining patterns were significantly increased in both BRCA1-
(p < .0001) and BRCA2-associated cancers (p < .0001). No significant expression levels in the sporadic forms were observed.
nPARP levels were significantly increased in HR-positive BRCA-associated cancers compared to HR-positive sporadic cancers
(p < 0.0001). No significant increase in nPARP expression in the few cases of sporadic triple-negative cancers was noticed. Our
results suggest that nPARP expression is associated with BRCA dependent DNA repair deficiency. Further studies with larger
cohorts are required to confirm this and its potential role as a predictive biomarker for PARP inhibition in hereditary as well as
in sporadic breast cancer.
Biography
Luka Ozretic was born in Split, Croatia, in 1984. He gained his MD degree from the University of Zagreb School of Medicine in 2008 and is currently an anatomic pathology resident working in the University Hospital of Cologne, Germany. His fields of interest include breast pathology, cytopathology and hematopathology.
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