WT1 and hematopoietic and lymphoid system neoplasm: This is in agreement with Liu et al. 201421 who studied WT1 gene expression by RT- PCR in the BM of 228 patients with hematologic neoplasms (leukemia, lymphoma, and multiple myeloma) and found no significant difference in WT1 expression levels between males and females but this is not in agreement with Sadek et al. 2011,26 who found significantly higher WT1-gene expression in males.