What question did this study set out to answer?

To systematically assess TFE3 gene rearrangements and copy number alterations in perivascular epithelioid cell neoplasms (PEComas).

A Distinctive Subset of PEComas Harbors TFE3 Gene Fusions

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Observational study uncovers TFE3 gene fusions in a distinctive subset of younger PEComa patients, suggesting a distinct clinicopathologic entity.

To systematically assess TFE3 gene rearrangements and copy number alterations in perivascular epithelioid cell neoplasms (PEComas).
Evaluated archival tumor samples from 29 PEComas, including 16 nonrenal PEComas and 13 renal angiomyolipomas, using a TFE3 break-apart fluorescence in situ hybridization (FISH) assay.
Performed immunohistochemical staining for TFE3 and Cathepsin K, alongside RT-PCR testing for PSF-TFE3 fusion transcripts in selected cases.
TFE3 gene rearrangements were identified by FISH in 4 of 16 nonrenal PEComas (mean patient age 24 years), all exhibiting strong (3+) TFE3 nuclear immunoreactivity, while 1 uterine PEComa metastasis demonstrated novel TFE3 gene amplification.
None of the remaining 24 PEComas (mean patient age 54 years) showed TFE3 gene alterations, although Cathepsin K was strongly positive across all tumors with TFE3 genetic abnormalities.

Argani et al. (2010) studied this question.

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Observational study uncovers TFE3 gene fusions in a distinctive subset of younger PEComa patients, suggesting a distinct clinicopathologic entity.