TFE3 and neoplasm with perivascular epithelioid cell differentiation: Also, among patients with malignant PEComas, there was no difference between those with uterine and extrauterine tumors in terms of frequency of TP53 mutations (33.3% vs. 25.0%, P = 0.99) or TFE3 positivity (33.3% vs. 37.5%, P = 0.99).