ETV6 and cancer: Assessment of clonality based on the estimated cancer cell fraction (CCF) of the mutations revealed that RUNX1, DNMT3A, IDH2, SRSF2, KRAS, and TET2 mutations were frequently clonal, whereas mutations in FLT3, ETV6, TP53, and other rare genes were often subclonal or minimally subclonal (Fig. 1c, d).