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Background  Approximately 5 to 10% of all cancers are caused by inherited germline mutations, many of which are associated with different Hereditary Cancer Syndromes (HCS). In the context of the Program of Hereditary Cancer of the Valencia Community, individuals belonging to specific HCS and their families receive genetic counselling and genetic testing according to internationally established guidelines. The current diagnostic approach is based on sequencing a few high-risk genes related to each HCS; however, this method is time-consuming, expensive and does not achieve a confirmatory genetic diagnosis in many cases. This study aims to test the level of improvement offered by a Next Generation Sequencing (NGS) gene-panel compared to the standard approach in a diagnostic reference laboratory setting.    Methods  A multi-gene NGS panel was used to test a total of 91 probands, previously classified as non-informative by analysing the high-risk genes defined in our guidelines.    Results  Nineteen deleterious mutations were detected in 16% of patients, some mutations were found in already-tested high-risk genes ( BRCA1 ,  BRCA2 ,  MSH2 ) and others in non-prevalent genes ( RAD51D ,  PALB2 ,  ATM ,  TP53 ,  MUTYH ,  BRIP1 ).    Conclusions  Overall, our findings reclassify several index cases into different HCS, and change the mutational status of 14 cases from non-informative to gene mutation carriers. In conclusion, we highlight the necessity of incorporating validated multi-gene NGS panels into the HCSs diagnostic routine to increase the performance of genetic diagnosis.    Electronic supplementary material  The online version of this article (10.1186/s13053-019-0104-x) contains supplementary material, which is available to authorized users.

hereditary cancer in clinical practice

Implementation of massive sequencing in the genetic diagnosis of hereditary cancer syndromes: diagnostic performance in the Hereditary Cancer Programme of the Valencia Community (FamCan-NGS)