Double heterozygosity in the BRCA1 and BRCA2 genes in the Jewish population.

BACKGROUND: The frequency and characteristics of disease in individuals who concomitantly harbor pathogenic mutations in both BRCA1 and BRCA2 genes are not established. MATERIALS AND METHODS: Data were collected from the database of Clalit Health Services National Familial Cancer Consultation Service. Probands referred to this clinical service and their family members are routinely tested for the three Jewish founder mutations (BRCA1: 185delAG, 5382insC, BRCA2: 6174delT). In addition, carriers identified in a population-based cohort of all cases diagnosed with breast cancer in Israel in 1987-1988 allowed the estimation of the population frequency of this phenomenon. RESULTS: In the clinic-based series of 1191 carriers of mutations in BRCA1 or BRCA2 belonging to 567 families, 22 males and females (1.85%) from 17 different families (3.0%) were found to harbor two different mutations. These included 18 individuals (1.51%) who concomitantly carried the 185delAG BRCA1 and the 6174delT BRCA2 mutations and four individuals (0.34%) who carried the 5382insC BRCA1 and the 6174delT mutations. All individuals were heterozygote carriers and none had a double mutation of both founder mutations in the BRCA1 gene itself. Seven of the 16 double carrier women (46.7%) had a personal history of breast carcinoma, diagnosed at a mean age of 44.6, compared with 372/926 (40.2%) carriers of a single mutation diagnosed with a mean age at diagnosis of 48.1 [odds ratio (OR)=1.3, 95% confidence interval (CI) 0.4-4.0]. One case (6.7%) had a personal history of ovarian carcinoma diagnosed at the age of 53 compared with 55/926 (5.9%) of the women with single mutation (OR=1.1, CI=0.2-7.6). The frequency of double mutations in the population-based national breast cancer cohort was 2.2% of all carriers, and 0.3% of all breast cancer cases in the Ashkenazi population in the cohort. The mean age at diagnosis of breast cancer was younger in the carriers of two mutations. CONCLUSION: Double carriers of mutations in the BRCA genes are rare and seem to be carrying a similar probability of developing breast and ovarian cancers as carriers of single mutations.

The TP53 Arg72Pro and MDM2 309G>T polymorphisms are not associated with breast cancer risk in BRCA1 and BRCA2 mutation carriers.

BACKGROUND: The TP53 pathway, in which TP53 and its negative regulator MDM2 are the central elements, has an important role in carcinogenesis, particularly in BRCA1- and BRCA2-mediated carcinogenesis. A single nucleotide polymorphism (SNP) in the promoter region of MDM2 (309T>G, rs2279744) and a coding SNP of TP53 (Arg72Pro, rs1042522) have been shown to be of functional significance. METHODS: To investigate whether these SNPs modify breast cancer risk for BRCA1 and BRCA2 mutation carriers, we pooled genotype data on the TP53 Arg72Pro SNP in 7011 mutation carriers and on the MDM2 309T>G SNP in 2222 mutation carriers from the Consortium of Investigators of Modifiers of BRCA1/2 (CIMBA). Data were analysed using a Cox proportional hazards model within a retrospective likelihood framework. RESULTS: No association was found between these SNPs and breast cancer risk for BRCA1 (TP53: per-allele hazard ratio (HR)=1.01, 95% confidence interval (CI): 0.93-1.10, P(trend)=0.77; MDM2: HR=0.96, 95%CI: 0.84-1.09, P(trend)=0.54) or for BRCA2 mutation carriers (TP53: HR=0.99, 95%CI: 0.87-1.12, P(trend)=0.83; MDM2: HR=0.98, 95%CI: 0.80-1.21, P(trend)=0.88). We also evaluated the potential combined effects of both SNPs on breast cancer risk, however, none of their combined genotypes showed any evidence of association. CONCLUSION: There was no evidence that TP53 Arg72Pro or MDM2 309T>G, either singly or in combination, influence breast cancer risk in BRCA1 or BRCA2 mutation carriers.

Differences in the characteristics of families with BRCA1 and BRCA2 mutations in Israel.

Three specific mutations in the BRCA1 (185delAG, 5382insC) and BRCA2 (6174delT) genes have been reported to be of high prevalence in the Jewish Ashkenazi population. We studied the differences in phenotype of families carrying these mutations. All consecutive families found by the CHS Familial Cancer Service to carry one of the three 'Jewish' mutations of the BRCA1/BRCA2 genes were evaluated for phenotypic characteristics. Chi-squared and Student's t-test statistics were employed to study differences in a variety of clinical and demographic parameters. A total of 111 families with 1499 family members were included. Among them 454 cases of cancer (297 in breast/ovary) were reported. Ovarian cancer, but not breast cancer, was detected at a significantly younger age among carriers of 185delT compared with other mutation carriers. In families with 185delAG, 5382insC and 6174delT mutations, breast cancer was found in 20.2, 39.4 and 24.1% of all identified women (born between 1900 and 1975), correspondingly. The corresponding figures for ovarian cancer were 13.9, 6.8 and 4.9%. Families carrying the 5382insC mutation had the highest probability of expressing bilateral breast cancer (38.9% of families, 15.4% of women with cancer, 6.1% of all women in family) and metachronous breast and ovary tumours (22.2, 9.8 and 4.5% correspondingly). Other tumours were reported in 7.9, 9.1 and 12.0% of women and 9.5, 12.9 and 15.8% of men in families with 185delAG, 5382insC, 6174delT, correspondingly. Marked phenotypic differences were found between families carrying different BRCA mutations warranting mutation-specific counselling to families seeking risk-reduction advice. 5382insC emerged as a most aggressive mutation.

Cancer genetics service provision: a comparison of seven European centres.

OBJECTIVE: To conduct a survey in seven European cancer genetics centres to compare service provision, organisation and practices for familial breast and colon cancer consultations and testing. Information was obtained on aspects of services both nationally and locally. METHODS: A detailed survey questionnaire was adapted collaboratively to obtain the required information. Initial survey data were collected within each centre and interim results were discussed at two European Workshops. Where differences in practice existed, details were clarified to ensure accuracy and adequacy of information. Participating centres were Haifa (Israel), Hannover (Germany), Leiden (The Netherlands), Leuven (Belgium), Manchester (UK), Marseille (France) and Milan (Italy), representing countries with populations ranging from 6.5 to 80 million. RESULTS: The European countries diverged in regard to the number of cancer genetics centres nationally (from 8 in Belgium to 37 in France), and the average population served by each centre (from 0.59 million in Israel to 3.32 million in Italy). All centres offered free care at the point of access, but referral to specialist care varied according to national health care provision. At a centre level, staff roles varied due to differences in training and health care provision. The annual number of counsellees seen in each participating centre ranged from 200 to over 1,700. Access to breast surveillance or bowel screening varied between countries, again reflecting differences in medical care pathways. These countries converged in regard to the wide availability of professional bodies and published guidelines promoting aspects of service provision. Similarities between centres included provision of a multidisciplinary team, with access to psychological support, albeit with varying degrees of integration. All services were dominated (70-90%) by referrals from families with an increased risk of breast cancer despite wide variation in referral patterns. Collection of pedigree data and risk assessment strategies were broadly similar, and centres used comparable genetic testing protocols. Average consultation times ranged between 45 and 90 min. All centres had access to a laboratory offering DNA testing for breast and bowel cancer-predisposing genes, although testing rates varied, reflecting the stage of service development and the type of population. Israel offered the highest number of genetic tests for breast cancer susceptibility because of the existence of specific founder mutations, in part explaining why the cancer genetics service in Haifa differed most from the other six. CONCLUSION: Despite considerable differences in service organisation, there were broad similarities in the provision of cancer genetic services in the centres surveyed.

[Hospital-at-home as a solution for the treatment requirements of acute exacerbation in multiple sclerosis].

Cooperation between the Multiple Sclerosis center at the Carmel medical center and the Hospital-at-Home (H.H) department of the continuing care unit in the Haifa and Western Galilee district of the Clalit Health Services has made it possible to give methylprednisolone intravenously to Multiple Sclerosis (M.S) patients during an acute exacerbation of the disease, in their home. In this study, we describe the joint work of the two centers. We have summarized 30 treatment courses given to 26 patients in their homes, following referral by the M.S. center, in the year 1999. The aims of the study included assessing satisfaction, safety and cost-effectiveness in a treatment course in the HH framework, as compared to the same treatment being conducted in the framework of hospitalization in various neurological departments, as was done in the past in the same group of patients. The expenses involved in HH for this group of patients were only 14% of the parallel treatment in the hospital (a savings of 86%). The treatment has proven to be extremely safe. There were no side-effects that required returning patients to the hospital, and the treatment was given in conditions of maximum comfort for the patient and his family. A telephone survey was conducted, which compared the satisfaction with the HH treatment, and the burden caused the patient's family to prior hospitalization for the same treatment. For all of the parameters examined, greater satisfaction was distinctly proven in the HH treatment. In light of these findings, we can conclude that giving methylprednisolone intravenously to M.S patients during an acute exacerbation, in the HH framework, is a safe and cost effective treatment, preferred by the patient and his family.

Proband family uptake of familial-genetic counselling.

Familial-genetic counselling for breast/ovarian cancers is a process initiated by a proband, and designed for all her/his blood relatives. This study focused on family members' uptake of an invitation to participate in counselling as a function of proband and family determinants. Of 163 breast/ovarian syndrome families tested, 67 carrying one of the three known Jewish mutations were included. For both the proband and family members, demographic variables, cancer status, position in the family and type of referral (proband only) were examined. Eligible family members' uptake rate was 34%. Lower family uptake was associated with the proband having cancer, and/or being doctor-referred (vs self-referred). Individuals of either the proband's or older generations had lower uptake rates compared with family members of younger generations. Being a cancer patient or a first degree relative of either a cancer patient or the proband was related to higher uptake. The study results indicate that baseline information routinely gathered by counselling services can be useful in predicting uptake. Providing insight into complex barriers to genetic counselling, these results also suggest potential directions for interventions to improve uptake, thereby enhancing individuals' abilities to make informed decisions regarding issues such as genetic testing.