From the Journals

Age at RRSO affects peritoneal cancer risk in BRCA mutation carriers

 

Key clinical point: BRCA mutation carriers who undergo risk-reducing surgery at an older age have a higher risk of developing metachronous peritoneal carcinomatosis.

Major finding: Women with BRCA 1 were at a higher risk for developing peritoneal carcinomatosis, as were those who underwent surgery at an older age.

Data source: A literature search to identify patients with BRCA 1/2 mutations who had undergone risk-reducing surgery and developed peritoneal carcinomatosis; 36 cases were identified and compared with a control group from a single institution.

Disclosures: No specific funding was disclosed. The authors had no disclosures.

Source: Hamsen MG et al. Cancer. 2018 Jan 9. doi: 10.1002/cncr.31211.

In an accompanying editorial, Christine S. Walsh, MD, of Cedars-Sinai Medical Center in Los Angeles, notes that the study authors have “done a commendable job in trying to shed light on a rare condition,” which occurs in about 1%-4% of women who undergo risk-reducing salpingo-oophorectomy (RRSO).

These findings can provide more information to clinicians, as they seek to guide and counsel women after they undergo RRSO, she wrote.

Dr. Walsh pointed out that National Comprehensive Cancer Network guidelines for genetic/familial high-risk assessment of breast and ovarian cancer specify the optimal ages when RRSO should be performed, but despite efforts to encourage this, occult gynecologic carcinomas still are found in approximately 4.5%-9% of women, with serous tubal intraepithelial carcinoma lesions developing in approximately 5%-8% of them.

“Ideally, the goal should be to intervene with a prophylactic surgery before the development of cancerous or precancerous pathology,” she wrote. Dr. Walsh had no disclosures.


 

FROM CANCER

Carriers of the BRCA1/2 mutation who undergo risk-reducing salpingo-oophorectomy (RRSO) still face a risk of developing metachronous peritoneal carcinomatosis, according to new findings published in Cancer.

The risk was predominantly observed in BRCA1 mutation carriers, and disease development generally occurred within 5 years following RRSO. Women who underwent RRSO at an age older than that currently recommended also had a higher risk of developing peritoneal carcinoma.

Their median age was 52 years at the time they underwent surgery, and 60 years when they were diagnosed with peritoneal carcinomatosis. As compared with the control group, the patients were older at the time they underwent RRSO (P = .025).

In eight RRSO specimens that were obtained from women who subsequently developed peritoneal carcinomatosis, five (62.5%), had serous tubal intraepithelial carcinoma (STIC) and one had epithelial atypia.

“The findings of the current study can be used to refine gynecologic counseling for BRCA1/2 mutation carriers who consider risk-reducing surgery and to stress the importance of complete RRSO at the recommended ages,” wrote lead author Marline G. Harmsen, MD, PhD, of the Radboud University Medical Center, Nijmegen, the Netherlands.

BRCA1/2 mutation carriers face a higher risk of developing ovarian carcinoma, and RRSO can reduce that risk by 80%-96%. Surgery is recommended for carriers of BRCA1 mutations aged 35-40 years and for BRCA2 mutation carriers aged 40-45 years.

In this study, Dr. Harmsen and her colleagues conducted a literature search in order to collect and analyze clinical and pathological data from women with BRCA1/2 mutation who developed peritoneal carcinomatosis following RRSO. The cases that were identified were then compared with a cohort from a single institution.

Of the 36 cases that were identified, 86.1% were BRCA1 mutation carriers and the remaining 5 patients had a BRCA2 mutation. The median age at the time of surgery differed significantly between BRCA1 (51 years; range, 30-71 years) and BRCA2 mutation carriers (57 years; range, 56-65 years) (P = .006).

The majority of women had undergone salpingo-oophorectomy (31; 86.1%), and 16 (44.4%) had also had a hysterectomy.

The authors found that several statistically significant differences between the case studies and the control group: the median age surgery (52 vs. 46 years), percentage of BRCA1 mutation carriers (86.1% vs. 53.1%, P less than .001), and percentage of serous tubal intraepithelial carcinomas in the RRSO specimens (62.5% vs. 0%; P less than .001).

SOURCE: Hamsen MG et al. Cancer. 2018 Jan 9. doi: 10.1002/cncr.31211.

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