Prevalence of pathogenic variants in cancer‐predisposing genes in second cancer after childhood solid cancers

Abstract Background Second malignant neoplasms (SMNs) are one of the most severe late complications after pediatric cancer treatment. However, the effect of genetic variation on SMNs remains unclear. In this study, we revealed germline genetic factors that contribute to the development of SMNs after treatment of pediatric solid tumors. Methods We performed whole‐exome sequencing in 14 pediatric patients with SMNs, including three brain tumors. Results Our analysis revealed that five of 14 (35.7%) patients had pathogenic germline variants in cancer‐predisposing genes (CPGs), which was significantly higher than in the control cohort (p