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To identify novel oncogenic targets in head and neck squamous cell carcinoma (HNSCC), we have analyzed antitumor microRNAs (miRNAs) and their controlled molecular networks in HNSCC cells. Based on our miRNA signature in HNSCC, both strands of the miR-99a -duplex ( miR-99a-5p : the guide strand, and miR-99a-3p : the passenger strand) are downregulated in cancer tissues. Moreover, low expression of miR-99a-5p and miR-99a-3p significantly predicts poor prognosis in HNSCC, and these miRNAs regulate cancer cell migration and invasion. We previously showed that passenger strands of miRNAs have antitumor functions. Here, we screened miR-99a-3p -controlled oncogenes involved in HNSCC pathogenesis. Thirty-two genes were identified as miR-99a-3p -regulated genes, and 10 genes ( STAMBP , TIMP4 , TMEM14C , CANX , SUV420H1 , HSP90B1 , PDIA3 , MTHFD2 , BCAT1 , and SLC22A15 ) significantly predicted 5-year overall survival. Notably, among these genes, STAMBP , TIMP4 , TMEM14C , CANX , and SUV420H1 were independent prognostic markers of HNSCC by multivariate analyses. We further investigated the oncogenic function of STAMBP in HNSCC cells using knockdown assays. Our data demonstrated that the aggressiveness of phenotypes in HNSCC cells was attenuated by si STAMBP transfection. Moreover, aberrant STAMBP expression was detected in HNSCC clinical specimens by immunohistochemistry. This strategy may contribute to the clarification of the molecular pathogenesis of this disease.

Regulation of Oncogenic Targets by miR-99a-3p (Passenger Strand of miR-99a-Duplex) in Head and Neck Squamous Cell Carcinoma