MDM4 and retinoblastoma: Overall, 68.8% of 13,823 ortholog probe pairs in RbTKO, 71.2% of 11,273 ortholog probe pairs in MDMX, and 69.6% of 11,059 ortholog probe pairs in p53TKO showed agreement in gene expression (upregulation or downregulation) between human retinoblastoma and the respective mouse counterpart (Sup.