SDHB and gastrointestinal stromal tumor: Over the last years, it became apparent that the so‐called “WT‐GIST group” is quite heterogeneous with regards to clinical phenotype and molecular characteristics.6 Based on recent advances in molecular pathology, GISTs can be sub‐classified in an SDH‐competent and an SDH‐deficient group, irrespective of whether they are sporadic or familial/genetic.