CDKN1B and leiomyosarcoma: The expression levels of miR-221, miR-320a, miR-133a, and miR-133b as well as their target mRNAs CDKN1B, TGFBR1, and IGF1R were assessed by quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR) in tissue samples from 33 patients with leiomyosarcoma.