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OP018/#414 Progression free survival and overall survival after BRCA1/2-ASSOCIATED epithelial ovarian cancer: a matched cohort study
  1. B Heemskerk-Gerritsen1,
  2. A Hollestelle1,
  3. I Van Den Beek2,
  4. W Van Driel3,
  5. K Van Engelen4,
  6. E Gómez Garcia5,
  7. J De Hullu6,
  8. M Koudijs7,
  9. M Mourits8,
  10. M Hooning1 and
  11. I Boere1
  1. 1Erasmus MC Cancer Institute, Medical Oncology, Rotterdam, Netherlands
  2. 2Amsterdam University Medical Center (AMC), Clinical Genetics, Amsterdam, Netherlands
  3. 3Netherlands Cancer Insitute, Gynecology, Amsterdam, Netherlands
  4. 4Amsterdam University Medical Center (VUmc), Clinical Genetics, Amsterdam, Netherlands
  5. 5Maastricht University Medical Center, Clinical Genetics, Maastricht, Netherlands
  6. 6Radboud University Medical Center, Obstetrics and Gynecology, Nijmegen, Netherlands
  7. 7Utrecht University Medical Center, Biomedical Genetics, Utrecht, Netherlands
  8. 8University Medical Center Groningen, Gynaecology and Obstetrics, Groningen, Netherlands


Objectives BRCA1/2-associated epithelial ovarian cancer (EOC) has been associated with better progression-free survival (PFS) and overall survival (OS) than sporadic EOC. Higher sensitivity to chemotherapy may be an explanation, but data are scarce.

Methods We matched 512 BRCA1/2-associated EOC patients selected from the national Hereditary Breast and Ovarian Cancer Netherlands (HEBON) database to 512 sporadic EOC patients from the National Cancer Registry on year of birth, year of EOC diagnosis (range 1989–2015), and FIGO stage (≤IIA/≥IIB). All patients were treated with chemotherapy. We used Cox models with the sporadic group as the reference to obtain hazard ratios (HR) with corresponding 95% confidence intervals (CI). Since BRCA1/2 mutation carriers who received a DNA test after EOC diagnosis survived at least until this DNA test, which may result in survival bias, we also performed prospective analyses including only BRCA1/2-associated EOC patients with a DNA test result before EOC diagnosis (n=82) and their matched sporadic controls.

Results The mean follow-up was 4.4 years (range 0.1–30.1). For the first 5 years after EOC diagnosis, the HRs for PFS (0.85, 95% CI 0.73–0.98) and OS (0.58, 95% CI 0.49–0.69) were in favor of the BRCA1/2 EOC patients. In the prospective analyses, survival benefit withstand for PFS (HR 0.66, 95% CI 0.45–0.98), and – to a lesser extent – for OS (HR 0.69, 95% CI 0.44–1.1).

Conclusions For EOC patients treated with chemotherapy, we confirmed survival benefit for BRCA1/2 mutation carriers. This may indicate higher sensitivity to chemotherapy, both in first line treatment and in the recurrent setting.

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