RT Journal Article SR Electronic T1 Functionality of the Tumor Suppressor microRNA-1 in Malignant Tissue and Cell Line Cells of Uterine Leiomyosarcoma JF Anticancer Research JO Anticancer Res FD International Institute of Anticancer Research SP 1547 OP 1550 VO 38 IS 3 A1 MATTHIAS B. STOPE A1 VICTOR CERNAT A1 ANNE KAUL A1 KAROLINE DIESING A1 DOMINIQUE KOENSGEN A1 MARTIN BURCHARDT A1 ALEXANDER MUSTEA YR 2018 UL http://ar.iiarjournals.org/content/38/3/1547.abstract AB Background/Aim: Uterine leiomyosarcoma (uLMS) is a very rare mesenchymal tumor showing an aggressive clinical course and poor prognosis for patients. Due to the low incidence, little is known about molecular tumor biology and biomarkers of uLMS. Micro-RNA-1 (miR-1) has been identified as a pivotal tumor suppressor in numerous entities being suited as a molecular marker for tumor progression. Materials and Methods: uLMS patient samples were analyzed regarding their miR-1 expression levels. Furthermore, miR-1 growth inhibitory and target regulatory properties were examined in transfected uLMS cells SK-UT-1. Results: miR-1 was strongly suppressed in uLMS tumor tissue compared to adjacent healthy tissue. In vitro studies, however, failed to detect growth inhibitory properties of miR-1 in SK-UT-1 cells. The expression of the cell survival and MAP kinases Erk-1/2 and p38 was not targeted by miR-1. Conclusion: Tumor suppressive mechanisms of miR-1, seem to be inhibited in uLMS SK-UT-1 cells, maybe as part of the malignant transformation process. Regardless of the microRNA's cellular functionality, miR-1 may represent a promising biomarker of diagnosis in uLMS therapy.