This might also explain the heterogeneity in expression levels of QKI (Fig. 4B), and also the fact that unlike ESRP1 and ESRP2, the expression levels of RBFOX2 in the Wilms’ tumor xenograft samples are heterogeneous and not similar to those in hFK1 (Fig. 4B). This evidence concerns the gene ESRP2 and Wilms tumor.