the mean antigen expression on tumor cells obtained from pediatric brain tumor patient-derived orthotopic xenograft models was 68% for B7-H3, 74.1% for GD2, 37.5% for IL-13Rα2, 50.1% for EphA2 and 36.1% for HER2 (33). This evidence concerns the gene ERBB2 and neoplasm.