WT1 and neoplasm: Thus, our findings regarding the WT1 nuclear staining of stromal cells that are morphologically suggestive of fibroblasts and/or myofibroblasts in the extrarenal connective tissue, located at a significant distance from the WT1-negative tumor tissue, in 8.92% of evaluated cases is relatively unsurprising, even though the metabolic significance of this finding is unclear.