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Ovarian cancer patients at high risk of BRCA mutation: the constitutional genetic characterization does not change prognosis

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Abstract

Ovarian neoplasms secondary to germline BRCA mutations had been described to have a more favourable survival. There is only few data concerning the prognosis of non mutated patients presenting clinical features evocative of BRCA alterations. We retrospectively collected data from patients treated in our institution for an invasive ovarian carcinoma between 1995 and 2011. Patients considered at high risk of BRCA mutation were tested for BRCA1/2 germline mutations. We described clinical, pathological and therapeutic features and compared prognosis of BRCA mutation carriers and non-mutated patients. Out of 617 ovarian cancer patients, we identified 104 patients who were considered at high risk of mutation. The 33 mutated patients were more likely to present a personal (33 vs. 10 %, p = 0.003) or a family (42 vs. 24 %, p = 0.06) history of breast/ovarian cancers. BRCA1/2 mutation carriers and wild type patients displayed similar prognosis: median progression–free survival (PFS) of 20.9 versus 37.7 months (p = 0.21); median overall survival (OS) of 151.2 versus 122.5 months (p = 0.52). Personal history of breast cancer increased both PFS [HR = 0.45 (95CI 0.25–0.81)] and OS [HR = 0.35 (95CI 0.16–0.75)]. In multivariate analysis, this parameter was an independent prognostic feature, whereas the identification of a BRCA1/2 mutation was not. In our cohort, all patients at high risk of BRCA mutation share a similar prognosis, whatever is their germline mutation status. Prognosis seems to be more influenced by clinical history than by germline mutations identification. If it is confirmed in larger and independent series, this result suggests that the hypothesis of other BRCA pathway alterations (BRCAness phenotype) deserves to be deeply explored.

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10689_2016_9873_MOESM1_ESM.tif

Online Resource 1: Overall survival curves according to BRCA1/2 mutation risk prediction. N = 513 for the ‘low risk of mutation’ cohort, and n = 100 for the ‘high risk of mutation’ cohort (TIFF 1230 kb)

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Sabatier, R., Lavit, E., Moretta, J. et al. Ovarian cancer patients at high risk of BRCA mutation: the constitutional genetic characterization does not change prognosis. Familial Cancer 15, 497–506 (2016). https://doi.org/10.1007/s10689-016-9873-9

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