TGFBR2 and nasopharyngeal carcinoma: Alternatively, based on this miRNA expression profiling data, we next re-classified clinical samples into high and low TGFβR2 expression NPC subgroups and normal control group, and interestingly discovered a cluster set of TGFβR2-associated miRNAs (miR-93, miR-20a, miR-20b and miR-18a), which all belong to miR-17-92 cluster and its paralogues.