PSMB9 and leiomyosarcoma: In clinical studies to date, the differential expression status of five factors (caveolin 1, cyclin B, cyclin E, Ki-67/MIB1, and LMP2/β1i) in the tissues of various uterus mesenchymal tumors of (normal mesenchymal, uterine leiomyoma, leiomyoma with Bizarre Nuclei, STUMP, leiomyosarcoma, LANT) has been reported [22].