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Research Article| Volume 153, ISSUE 2, P326-334, May 2019

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Retrospective study of a 16 year cohort of BRCA1 and BRCA2 carriers presenting for RRSO: Prevalence of invasive and in-situ carcinoma, with follow-up

      Highlights

      • The majority of high grade serous carcinoma in our cohort were of tubal origin.
      • High grade serous carcinoma was more common in BRCA1/2 carriers undergoing RRSO after the recommended age.
      • Isolated STIC can give rise to peritoneal serous carcinoma >7 years post-RRSO.

      Abstract

      Objectives

      Carriers of BRCA1 and BRCA2 mutations are at increased risk of high grade serous carcinoma and are therefore offered risk-reducing salpingo-oophorectomy (RRSO) by 40–45 years. Most of these carcinomas are believed to arise in the fallopian tube from serous tubal intraepithelial carcinoma (STIC). We conducted a retrospective study on the prevalence of high grade serous carcinoma and STIC in BRCA1/2 carriers presenting for RRSO, and their follow-up.

      Methods

      Consecutive BRCA1/2 carriers presenting for an RRSO at Erasmus MC (2000–2016) were studied. SEE-FIM pathology protocol was followed from 2010 onwards. For the cases with carcinoma and/or STIC, the histology was reviewed and immunohistochemistry (p53 & MIB-1) was performed. Next Generation Targeted Sequencing (NGTS) for TP53 mutation was used to establish clonality in 2 cases.

      Results

      Of the 527 included patients, 68% were BRCA1, 31.6% were BRCA2, and 0.4% carried both mutations. The prevalence of high grade serous carcinoma was 2.3% (12/527); 59% of these were of tubal origin. High grade serous carcinoma was more common in patients operated on after the recommended age (p = 0.03). Isolated STIC was present in 0.8% (4/527). Two BRCA1 carriers with isolated STIC at RRSO developed peritoneal serous carcinoma >7 years later. Identical TP53 mutations in the peritoneal serous carcinoma and the preceding STIC established their clonal origin.

      Conclusions

      High grade serous carcinoma is more common in BRCA1/2 carriers presenting for RRSO after the recommended age, and is more often of tubal origin. Longer follow up of patients with STIC at RRSO should be considered.

      Keywords

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