1. Komatsu S, Ichikawa D, Kawaguchi T, Miyamae M, Okajima W, Ohashi T et al (2016) Circulating miR-21 as an independent predictive biomarker for chemo resistance in oesophageal squamous cell carcinoma. Am J Cancer Res 6(7):1511–1523
2. Lan H, Lu H, Wang X, Jin H (2015) MicroRNAs as potential biomarkers in cancer: opportunities and challenges. Biomed Res Int 2015(125094):17. https://doi.org/10.1155/2015/125094
3. Hongbo LV, Zhanao HE, Wang H, Du T, Pang Z (2016) Differential expression of miRNA-21 and miRNA-375 in oesophageal carcinoma patients and its clinical implication. Am J Trans Research 8(7):3288–98
4. Hwang J, Min BH, Jang J, Kang SY, Bae H, Jang SS, Kim JI, Kim KM (2018) MicroRNA expression profiles in gastric carcinogenesis. Sci Rep 8(1):14393. https://doi.org/10.1038/s41598-018-32782-8
5. Torre LA, Bray F, Siegel RL, Ferlay J, Lortel-Tieulent J, Jemal A (2015) Global cancer statistics. CA Cancer J Clin 10(12):108