Stopping ovarian cancer screening in BRCA1/2 mutation carriers: Effects on risk management decisions & outcome of risk-reducing salpingo-oophorectomy specimens
Introduction
Women who carry a BRCA1/2 mutation have a high lifetime risk of developing ovarian cancer. A recent prospective study estimated a lifetime risk for ovarian cancer in BRCA1 and BRCA2 mutation carriers of 59% (95% confidence interval (CI) = 43–76%) and 16.5% (95% CI = 7.5–34%), respectively [1]. Since 2007, the perspective on optimal risk management for ovarian cancer in BRCA1/2 mutation carriers has changed in response to studies which reported that ovarian cancer screening (OCS) lacked effectiveness for early detection of ovarian cancer in these mutation carriers [2], [3], [4], [5]. In light of these findings and in advance of national guideline changes, our family cancer clinic stopped offering OCS in October 2009. From that time onwards, the only ovarian cancer risk management option offered to BRCA1/2 mutation carriers is risk-reducing salpingo-oophorectomy (RRSO). RRSO is recommended for patients younger than the age at which the ovarian cancer incidence rises, 35 to 40 years for BRCA1 mutation carriers and 40 to 45 years for BRCA2 mutation carriers, provided that the patients have completed their childbearing [6], [7], [8]. RRSO reduces the risk of ovarian cancer with 80–90% when performed within the recommended age range [9], [10], [11], [12], [13], [14]. Moreover, RRSO may also reduce the risk of breast cancer in premenopausal women [9], [10], [11], [12], [13], [14]. However, RRSO is also associated with adverse effects in premenopausal women due to acute surgical menopause [15], [16], [17].
Both younger age and nulliparity at the time of receiving the DNA test result were factors related to a longer interval between receiving DNA test results and RRSO [18], [19], [20], [21]. In the aforementioned studies BRCA1/2 mutation carriers could choose between OCS and RRSO. Our objective was to investigate the effect of stopping OCS on the timing and uptake of RRSO and on the percentage of occult cancers found in the RRSO specimens.
Section snippets
Study design and patients
A prospective cohort design was used to investigate the effect of stopping OCS on the timing and uptake of RRSO and on the percentage of occult cancers found in the RRSO specimens. This study was performed in BRCA1/2 mutation carriers who visited the family cancer clinic at least once between 1999 and June 2013. All the women who visited the family cancer clinic in this time period were asked for informed consent before entering their data into the prospectively maintained, password protected
Population
Between January 1999 and June 2013, 541 BRCA1/2 mutation carriers visited the family cancer clinic at least once. Of these, 24 (4.4%) women had already undergone bilateral salpingo-oophorectomy (for any reason) and 12 (2.2%) women had developed ovarian cancer before the date of receiving DNA test results. In total, 84 (15.5%) patient files were either unavailable (n = 38, 7.0%) or incomplete (n = 46, 8.5%). Two (0.4%) women were unable to make their own decisions due to a mental incapacity and were
Discussion
The objective of this study was to investigate the effect of stopping OCS on the timing and uptake of RRSO and on the percentage of occult cancers found in the RRSO specimens. We found that after stopping OCS the percentage of women who underwent RRSO within the recommended age range increased from 81 to 95%. Only one woman did not perform RRSO within the recommended age range in period II. This concerned a BRCA1 mutation carrier who received her DNA test results at the age of 39 years and
Contributors
The main writing was done by Catheleine M.G. van Driel, Geertruida H. De Bock, Jan C. Oosterwijk and Marian J.E. Mourits. The other authors contributed from their field of expertise.
Competing interests
None.
Conflict of interest statement
The authors declare that they have no conflict of interest.
Funding
None.
Ethics
Protection of the patients’ identity was guaranteed by assigning study-specific, unique patient numbers. According to Dutch law no further Institutional Review Board approval was needed for this study.
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