Validation of a guidelines-based digital tool to assess the need for germline cancer genetic testing

Abstract

PurposeEfficient and scalable solutions are needed to identify patients who qualify for germline cancer genetic testing. We evaluated the clinical validity of a brief, patient-administered hereditary cancer risk assessment digital tool programmed to assess if patients meet criteria for germline genetic testing, based on personal and family history, and in line with national guidelines. MethodsWe applied the tool to cases seen in a nationwide telehealth genetic counseling practice. Validity of the tool was evaluated by comparing the tools assessment to that of the genetic counselor who saw the patient. Patients histories were extracted from genetic counselor-collected pedigrees and input into the tool by the research team to model how a patient would complete the tool. We also validated the tools assessment of which specific aspects of the personal and family history met criteria for genetic testing. ResultsOf the 152 cases (80% ((121/152)) female, mean age 52.3), 56% (85/152) had a personal history of cancer and 66% (99/152) met genetic testing criteria. The tool and genetic counselor agreed in 96% (146/152) of cases. Most disagreements (4/6; 67%) occurred because the GCs assessment relied on details the tool was not programmed to collect since patients typically dont have access to the relevant information (pathology details, risk models). We also found complete agreement between the tool and research team on which specific aspects of the patients history met criteria for genetic testing. ConclusionWe observed a high level of agreement with genetic counselor assessments, affirming the tools clinical validity in identifying individuals for hereditary cancer predisposition testing and its potential for increasing access to hereditary cancer risk assessment.