Background: Undifferentiated endometrial sarcoma (UES) is a very rare subtype of uterine sarcoma, which has no consensus on the treatment. We investigated the expression of potential new therapeutic targets in UES to improve its aggressive clinical course and poor survival outcome.
Methods: The immunohistochemical expressions of vascular endothelial growth factor (VEGF), c-KIT, c-ABL, platelet derived growth factor receptor (PDGFR), protein kinase B (AKT1), mammalian target of rapamycin, epidermal growth factor receptor (EGFR), human epidermal growth factor receptor (HER2), Wilms tumor (WT1), aromatase inhibitor (CYP19A1), and histone deacetylase (HDAC) series in 10 UES patients were assessed using tissue microarrays.
Results: Strongly positive immunoreactivities were observed for VEGF, AKT1, and HDAC2/7 in 8 (80.0%) tumors; for CYP19A1 and HDAC6 in 9 (90%) tumors; and for HDAC1/4/8 in 10 (100%) tumors. Strong expression of CYP19A1 and HDAC6 was associated with distant recurrence (p = 0.030, both), and expression of WT1 indicated a more advanced stage (p = 0.033). UES treated with adjuvant therapy showed better disease-free and overall survivals (both 0 vs. 33.3%, p = 0.003).
Conclusion: VEGF, AKT1, CYP19A1, and the HDAC1/2/4/6/7/8 series show an especially high frequency of strong immunoreactivity in UES and can be considered potential therapeutic targets.
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