Psychiatric implications of cancer genetic testing

Abstract

As genetic testing for hereditary cancer syndromes has transitioned from research to clinical settings, research regarding its accompanying psychosocial effects has grown. Men and women being tested for hereditary cancer syndromes may experience some psychological distress while going through the process of testing or after carrier status is identified. Psychological distress appears to decrease over the course of the first year and it is typically not clinically significant. Longer term studies show mixed results with some mutation carriers continuing to experience elevated distress. Baseline distress is the greatest risk factor for both immediate (weeks-12 months) and long-term psychological distress (18 mo-8 years post genetic testing). In addition to baseline psychological distress, other risk factors can be identified to help identify individuals who may need psychosocial interventions during the genetic testing process. The challenges of providing clinical care to the growing population of individuals identified to be at increased risk for heritable cancers present opportunities for research and new models of care. Cancer 2015;121:341-60. V C 2014 American Cancer Society.KEYWORDS: BRCA1, BRCA2, HNPCC, Lynch syndrome, genetic testing, unaffected carrier, carrier, hereditary cancer syndrome, riskreducing surgeries, psychosocial. INTRODUCTIONSeveral familial cancer syndromes that confer a high lifetime risk of cancer can be identified with genetic testing, and greater numbers of men and women will consider testing as the availability and public awareness of genetic testing for cancer susceptibility continue to increase. Research to date suggests that these individuals will have varied emotional responses to the process of genetic testing as well as its results.When genetic testing for cancer syndromes first transitioned from research protocols to clinics, there was initial concern that it would be similar to genetic testing for Huntington disease. Many worried that knowing they are at high risk for cancer in the future may be too distressing for some individuals, possibly even leading to suicide. However, several systematic reviews focusing primarily on hereditary breast and ovarian cancer (HBOC) and Lynch syndrome, also known as hereditary nonpolyposis colon cancer (HNPCC), have demonstrated that most individuals who have a mutation identified in an associated gene cope well with the knowledge of their genetic status. 1-3 Data regarding psychological implications of the genetic testing process are the most robust for women who present for HBOC risk assessment, which involves discussion of the BRCA1 and BRCA2 genes, although there are increasing studies for HNPCC, familial adenomatous polyposis (FAP), and other hereditary cancer syndromes.Although the rates of distress in individuals undergoing genetic testing vary, they appear to be relatively small. Studies have demonstrated that approximately 6% to 24% of individuals undergoing genetic testing for a BRCA1/BRCA2-associated or HNPCC-associated mutations repo...

Should pretest genetic counselling be required for patients pursuing genomic sequencing? Results from a survey of participants in a large genomic implementation study

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