To determine whether EGFR protein expression might be used as a surrogate marker to identify cases with EGFR KDD, we performed immunohistochemical staining on three CMNs harboring EGFR KDD, one CMN known to carry ETV6-NTRK3 fusion, two cases of CCSK, and three cases of Wilms’ tumor. The gene discussed is NTRK3; the disease is Wilms tumor.