Baseline and post prophylactic tubal-ovarian surgery CA125 levels in BRCA1 and BRCA2 mutation carriers.

The aim of this study was to determine whether BRCA1 and BRCA2 mutation carriers have different baseline CA125 levels compared with non-carriers, and whether a significant difference in pre- and post-operative CA125 levels exists in BRCA mutation carriers undergoing risk-reducing bilateral salpingo-oophorectomy (RRBSO). The study also considered whether CA125 measurements should continue in unaffected BRCA mutation carriers after RRBSO. 383 Eligible women were identified through retrospective review of the BRCA Carrier Clinic at The Royal Marsden NHS Foundation Trust, London, UK. These women all had CA125 levels measured as they were either a carrier or at risk of a BRCA1 or BRCA2 mutation. Of these, 76 went on to have a negative predictive test for their familial mutation and so are classed as 'non-carriers'. 133 BRCA1 and 87 BRCA2 carriers had RRBSO, with a further 26 BRCA1 carriers, 28 BRCA2 carriers and one non-carrier developing ovarian cancer. The remaining 21 BRCA1 and 28 BRCA2 carriers did not have RRBSO or develop ovarian cancer in the time of study follow-up. CA125 levels were measured as surveillance or as part of pre-RRBSO care. CA125 measurement post-RRBSO was continued in 48 BRCA1 and 40 BRCA2 carriers. In 154 BRCA1 mutation carriers, the median baseline (i.e. before RRBSO and with no clinical signs of ovarian cancer) CA125 level was 9.0 U/ml (range 2-78) and was 10.0 U/ml (range 1-43) in 115 BRCA2 mutation carriers. When compared with the 75 non-carriers (median baseline CA125 10.0 U/ml; range 2-52), there was no significant difference between the BRCA1, BRCA2 and non-carrier groups. There was a significant reduction in CA125 from pre- to post-RRBSO in 48 BRCA1 carriers (p = 0.04) but no significant difference in 40 BRCA2 mutation carriers (p = 0.5). Out of a total of 220 mutation carriers who underwent RRBSO, two had an incidental ovarian cancer found on histopathology and another developed primary peritoneal cancer during the follow-up period. Our study is the first to compare initial serum CA125 levels in BRCA1 and BRCA2 mutation carriers with those of non-carriers. Our study found no significant difference between the three groups. A drop in CA125 levels after RRBSO in BRCA1 carriers supports the finding of earlier studies, but differed in that the fall was not seen in BRCA2 carriers. The finding of only one case of post-operative peritoneal cancer in 220 carriers undergoing RRBSO supports the discontinuation of post-RRBSO serum CA125 monitoring in BRCA mutation carriers.

Lymphocyte radiosensitivity in BRCA1 and BRCA2 mutation carriers and implications for breast cancer susceptibility.

There is conflicting evidence as to whether individuals who are heterozygous for germ-line BRCA1 or BRCA2 mutations have an altered phenotypic cellular response to irradiation. To investigate this, chromosome breakage and apoptotic response were measured after irradiation in peripheral blood lymphocytes from 26 BRCA1 and 18 BRCA2 mutation carriers without diagnosed breast cancer, and 38 unaffected age, ethnically and sex-matched controls. To assess the role of BRCA1 and BRCA2 in homologous recombination, an S phase enrichment chromosome breakage assay was used. BrdUrd incorporation studies allowed verification of the correct experimental settings. We found that BRCA1 mutation carriers without cancer had increased chromosome breaks as well as breaks and gaps per cell post irradiation using the classical G2 assay (p = 0.01 and 0.004, respectively) and the S phase enrichment assay (p = 0.01 and 0.01, respectively) compared to age-matched unaffected controls. BRCA2 mutation carriers without cancer had increased breaks as well as breaks and gaps per cell post irradiation using the S phase enrichment assay (p = 0.045 and 0.012, respectively). No difference was detected using the G2 assay (p = 0.88 and 0.40 respectively). BRCA1 and BRCA2 mutation carriers had normal cell cycle kinetics and apoptotic response to irradiation compared to age-matched controls. Our results show a demonstrable impairment in irradiation induced DNA repair in women with heterozygous germline BRCA1 and BRCA2 mutations prior to being diagnosed with breast cancer.

Guilt, blame and responsibility: men's understanding of their role in the transmission of BRCA1/2 mutations within their family.

Men and women who have a family history of breast and/or ovarian cancer may be offered a predictive genetic test to determine whether or not they carry the family specific BRCA1/2 mutation. The sons and daughters of mutation carriers have a 50 per cent chance of inheriting a mutation, which will increase their risk of developing cancer. Little is known about at-risk men's feelings about the part they play in the transmission of BRCA1/2 mutations within their families. This study investigated high risk men's responses to BRCA1/2 predictive genetic testing. Seventeen in-depth interviews were undertaken with carrier (n= 5) and non-carrier men (n= 12). All men described genetic testing as a familial duty. It is observed that carriers and non-carriers mobilised differing explanations about their role in the aetiology of risk. It is noted that men engage in a form of narrative reconstruction in which they draw upon discourses of guilt and blame or fate and predestiny in an effort to present themselves as morally responsible or blameless. It is argued that narrative reconstruction enables these men to reconcile their genetic identity, self and family.

We are talking, but are they listening? Communication patterns in families with a history of breast/ovarian cancer (HBOC).

This study explores how family communication patterns and family scripts influence the dissemination of genetic information and the sharing of feelings about genetic inheritance in families of healthy women who have attended a cancer genetics risk clinic because of their family history of breast and, or ovarian cancer. Family scripts are sets of expectations, beliefs, and norms that assign meaning to patterns of interaction, connect generations and provide guidance for action. We conducted an exploratory, qualitative study at a major clinical and research cancer center in the United Kingdom from January through June 2000 approved by the hospital clinical research and ethics committees. Twenty-one semi-structured, in-depth interviews were conducted using a purposive sample of women coming to the cancer genetics risk clinic for the first time, supplemented by 5 months of participant observation. We identified several communication patterns: open and supportive; directly blocked, indirectly blocked, self-censored and use of third parties. Some family members shared their feelings and discussed ways of trying to avoid developing breast or ovarian cancer; for others disseminating information or just talking about inherited susceptibility for breast and, or ovarian cancer fell into the script violation category; still others tried to renegotiate their family scripts.