miR-9 modulates the expression of interferon-regulated genes and MHC class I molecules in human nasopharyngeal carcinoma cells

► miR-9 can negatively or positively modulate interferon-induced gene expression. ► miR-9 can up-regulate major histocompatibility complex class I molecule expression. ► miR-9 can down-regulate the expression of interleukin-related genes.