Histologically, the ASPcKOP7cKO tumor cells stained sporadically for DESMIN but were no longer positive for RMS diagnostic markers MYOD1 and MYOGENIN; this was specific for ASPcKOP7cKO tumors as ASPcHetP7cKO and ASPcKOP7cHet tumors were still myogenic, small round blue tumors consistent with RMS (Fig. 7d). This evidence concerns the gene MYOD1 and neoplasm.