Telephoned BRCA1/2 genetic test results: prevalence, practice, and patient satisfaction.

While the traditional model of genetic evaluation for breast cancer risk recommended face-to-face disclosure of genetic testing results, BRCA1/2 testing results are increasingly provided by telephone. The few existing studies on telephone genetic counseling provide conflicting results about its desirability and efficacy. The current study aimed to (1) Estimate the prevalence among genetic counselors of providing BRCA1/2 genetic test results by phone (2) Assess patient satisfaction with results delivered by telephone versus in-person. A survey was sent to members of the Familial Cancer Risk Counseling Special Interest Group via the NSGC listserve and was completed by 107 individuals. Additionally, 137 patients who had received BRCA genetic testing results either by phone or in-person at UNC Chapel Hill Cancer Genetics Clinic were surveyed regarding satisfaction with the mode of their BRCA1/2 results delivery. The genetic counseling survey revealed that the majority of responding counselors (92.5%) had delivered BRCA1/2 genetic test results by telephone. Patients having received results either in person or by phone reported no difference in satisfaction. Most patients chose to receive results by phone and those given a choice of delivery mode reported significantly higher satisfaction than those who did not have a choice. Those who waited less time to receive results once they knew they were ready also reported higher satisfaction. This study found supportive results for the routine provision of BRCA1/2 genetic test results by telephone. Results suggest that test results should be delivered as swiftly as possible once available and that offering patients a choice of how to receive results is desirable. These are especially important issues as genetic testing becomes more commonplace in medicine.

Factors associated with African Americans' enrollment in a national cancer genetics registry.

This study explored whether reactions to the Cancer Genetics Network (CGN) or CGN enrollment differed by receipt of a standard informational brochure versus a targeted version addressing factors previously associated with African Americans' health behavior decisions and research participation. The 262 participants, identified through tumor registries or clinic contacts, were mailed brochures and completed phone interviews. When asked whether - based on the brochure - they were or were not 'leaning toward' CGN enrollment, about 75% of both standard and targeted groups reported leaning toward. When given the opportunity at the end of the interview, 68% enrolled in the CGN. Trust was strongly related to enrollment. Less education, less satisfaction with cancer care, and individualistic rather than collective orientation were associated with lower trust. Education was also bivariately associated with enrollment, but mediation analysis indicated that the operational mechanism of education's influence on enrollment was through trust.

Polymorphisms in the VKORC1 gene are strongly associated with warfarin dosage requirements in patients receiving anticoagulation.

BACKGROUND: Warfarin is a mainstay of therapy for conditions associated with an increased risk of thromboembolic events. However, the use of this common agent is fraught with complications and little is known regarding inter-individual variation in warfarin response. OBJECTIVE: We tested for association between single nucleotide polymorphisms (SNPs) in VKORC1 and CYP2C9 and average weekly warfarin dose required to maintain patients at their desired anticoagulation target. METHODS: The sample consisted of 93 European-American patients from anticoagulation clinics at the University of North Carolina at Chapel Hill. Data on mean weekly warfarin dose were collected over a mean treatment period of 20.6 months. ANCOVA models were used and haplotype analysis was performed. RESULTS: Three of six VKORC1 SNPs were found to be very strongly associated with the average warfarin dose required to achieve the target international normalised ratio (INR; p<0.0001). The mean weekly dose by genotype ranged from approximately 27 to 47 mg. There was no evidence for an association between either of the two CYP2C9 polymorphisms studied, CYP2C9*2 and CYP2C9*3. CYP2C9*3 was significantly (p = 0.05) associated with average warfarin dosage after adjustment for VKORC1*1173. CONCLUSIONS: These results are of considerable clinical interest and confirm recently published results regarding the role of these two genes in modifying warfarin metabolism and maintenance dosage. The consistent findings regarding the role of VKORC1 and CYP2C9 in warfarin metabolism and maintenance dosage represent a clinically useful proof of principal for the use of pharmacogenomic information in medicine and may lead to improved understanding of warfarin's actions.

Genetic association analysis of behavioral inhibition using candidate loci from mouse models.

Genes influence the development of anxiety disorders, but the specific loci involved are not known. Genetic association studies of anxiety disorders are complicated by the complexity of the phenotypes and the difficulty in identifying appropriate candidate loci. We have begun to examine the genetics of behavioral inhibition to the unfamiliar (BI), a heritable temperamental predisposition that is a developmental and familial risk factor for panic and phobic disorders. Specific loci associated with homologous phenotypes in mouse models provide compelling candidate genes for human BI. We conducted family-based association analyses of BI using four genes derived from genetic studies of mouse models with features of behavioral inhibition. The sample included families of 72 children classified as inhibited by structured behavioral assessments. We observed modest evidence of association (P = 0.05) between BI and the glutamic acid decarboxylase gene (65 kDA isoform), which encodes an enzyme involved in GABA synthesis. No significant evidence of association was observed for the genes encoding the adenosine A(1A) receptor, the adenosine A(2A) receptor, or preproenkephalin. This study illustrates the potential utility of using candidate genes derived from mouse models to dissect the genetic basis of BI, a possible intermediate phenotype for panic and phobic disorders.

History of childhood attention deficit hyperactivity disorder (ADHD) features among adults with panic disorder.

BACKGROUND: The prevalence of ADHD features during childhood and its relationship to the course and presentation of panic in adults with panic disorder was examined. METHODS: The presence of DSM-III-R ADHD was retrospectively ascertained in a cohort of 85 adults with panic disorder by structured interview. RESULTS: Childhood ADHD features occurred in 23.5% of panic subjects; 9.4% satisfied full DSM-III-R criteria for ADHD, 14.1% had 'subthreshold' diagnoses. Two-thirds of panic patients with ADHD indicated persistence of symptoms into adulthood. Fewer had married or completed college than those with panic alone. There was no significant difference in clinical pattern and severity of panic, or comorbidity of adult Axis I and childhood anxiety disorders in both groups. CONCLUSION: Given its frequency and persistence, ADHD comorbidity is an important clinical consideration in all panic patients. Its co-occurrence does not influence the clinical pattern of panic, but may contribute to adverse social outcome.