Staining for WT1 should be performed with both types of WT1 antibodies (C-/N-terminus), while additional IHC markers (INI1, useful in ruling out malignant rhabdoid tumor) and additional molecular testing (reverse transcription polymerase chain reaction for EWS-WT1 novel fusion transcript, due to a recurrent chromosomal translocation t(11;22)(p13;q12), which is seen in ~90% of DSRC tumors [49]) will serve to further objectify definitive diagnosis [22]. This evidence concerns the gene WT1 and rhabdoid tumor.