1. Inherited mutations in fallopian tube, ovarian and primary peritoneal carcinoma: Changes in diagnoses and mutational frequency over 20 years.
- Author
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Weiss, Arielle S., Swisher, Elizabeth, Pennington, Kathryn P., Radke, Marc, Khasnavis, Nithisha, Garcia, Rochelle L., Kilgore, Mark R., Lee, Ming K., and Norquist, Barbara M.
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FALLOPIAN tubes , *OSTEOCHONDROSIS , *CARCINOMA , *PERITONEAL cancer , *BRCA genes , *TISSUE banks - Abstract
Women with fallopian tube carcinoma (FTC) are reported to have a higher frequency of inherited BRCA mutations than those with ovarian carcinoma (OC) or primary peritoneal carcinoma (PPC). We hypothesized that routine serial sectioning of fallopian tubes would increase the proportion of cases designated as FTC and change the frequency of inherited mutations between carcinoma types. Eight hundred and sixty-seven women diagnosed from 1998 to 2018 were enrolled at diagnosis into an institutional tissue bank. Germline DNA, available from 700 women with FTC (N = 124), OC (N = 511) and PPC (N = 65), was assessed using targeted capture and massively parallel sequencing for mutations in ovarian carcinoma susceptibility genes. Cases were divided between those prior to routine serial sectioning (1998–2008) and after (2009–2019), and the frequency of FTC and inherited mutations was assessed. The proportion of carcinomas attributed as FTC after 2009 was 28% (128/465), significantly higher than before 2009 [5% (21/402), p <.0001, OR 6.9, 95% CI 4.3–11.2], with subsequent decreases in OC and PPC. In the sequenced group, overall inherited mutation frequency in FTC (24/124, 19%), OC (106/511, 21%, p =.42), and PPC (16/65, 25%, p =.25) were similar. Germline mutation rates in FTC were lower after 2009,16/107 cases (15%), compared to 8/17 cases (47.1%) before 2009 (p =.005, OR 0.20, 95% CI 0.06–0.64). The prevalence of inherited mutations is similar in FTC compared to OC or PPC when using modern pathological assignment. Complete serial sectioning of fallopian tubes has significantly increased the diagnosis of FTC, and subsequently decreased the frequency of inherited mutations within this group. • Routine serial sectioning of fallopian tubes increased the fallopian tube cancer proportion by five-fold. • Routine serial sectioning of fallopian tubes decreased the ovarian and primary peritoneal cancer proportion. • Fallopian tube cancer identified on serial sectioning was associated with a reduced frequency of germline mutations. • Germline mutation frequency is similar for women with fallopian tube, ovarian or primary peritoneal cancer. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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