In addition to the overexpression of miR-1246 in various cancer tissues, miR-1246 is significantly enhanced in serum derived from nude mice implanted with primary human pancreatic ductal adenocarcinoma [27]. Moreover, serum miR-1246 has been showed to be up-regulated in patients with early-stage cervical squamous cell carcinoma, indicating that serum miR-1246 may be a promising biomarker for early detection of cervical squamous cell carcinoma [28]. Also, serum miR-1246 was significantly higher in primary colorectal cancer patients [29]. Similarly, circulating microRNA is increased in patients with ESCC and multiple myeloma [26,30].