MicroRNAs (miRNAs), a class of short (18-23 nucleotides) non-coding RNAs, are implicated in the post-transcriptional repression of messenger RNAs (Ling et al., 2013; Bartel et al., 2004). Recently, miRNAs have been identified to interact with a variety of cancer-related proteins and promote cell proliferation and differentiation. Hence, they are regarded as the ideal noninvasive biomarker candidates for early diagnosis and monitoring of cancer (Ambros et al., 2004; Kosaka et al., 2010).