Affiliations: [a] School of Clinical Medicine, Gastroenterological Surgery, Affiliated Hospital of Qingdao University, Qingdao, Shandong, China | [b] Department of Gastrointestinal Surgery, Jining NO.1 People’s Hospital, Jining, Shandong, China | [c] Department of Imaging, Yantai Yuhuangding Hospital, Yantai, Shandong, China | [d] Department of PET/CT, Yantai Yuhuangding Hospital, Yantai, Shandong, China | [e] Department of Gastroenterology, Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
Correspondence:
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Corresponding author: Bin Cao, Department of Gastroenterology, Affiliated Hospital of Qingdao University, Qingdao, Shandong, China. Tel.: +86 13656683268; E-mail: love5028@126.com.
Note: [1] These authors contributed equally to the study.
Abstract: BACKGROUND AND OBJECTIVE: MicroRNAs (miRNAs) are under investigation as novel diagnostic and prognostic biomarkers in several malignancies, including gastric cancer (GC). miR-25 was overexpressed in GC tissues, and higher miR-25 expression was statistically correlated with aggressive clinicopathological characteristics. In our study, we investigate the associations of serum miR-25 level with the clinicopathological characteristics, diagnosis and prognosis of GC patients. METHODS: Serum samples from 184 GC patients, 56 gastritis patients and 78 healthy controls were subjected to real-time quantitative polymerase chain reaction (RT-qPCR), and the relationship between micR-25 level and cliniopathological characteristics including diagnosis and prognosis was explored. RESULTS: Compared with the gastritis and healthy patients, serum miR-25 level was significantly up-regulated in patients with GC. Using a cut-off of 0.042, the level of miR-25 was significantly increased in serum samples from cancer patients; Using this test cancer patients were identified with 67.3–69.4% sensitivity and 80.4%–81.0% specificity. High serum miR-25 level was significantly associated with depth of invasion, lymph node metastasis and stage of disease. In univariate and multivariate analyses, miR-25 was an independent prognostic factor for overall survival (OS). Moreover, high serum miR-25 level was correlated with poor prognosis in patients subgroups stratified by tumor size, depth of invasion and lymph node metastasis. Serum miR-25 level was increased in both prominent serosal invasion group and lymph node metastasis group. Furthermore, stratified analysis showed that the TNM stage I–VI patients with high serum miR-25 level had poor prognosis than those with low serum miR-25 level. CONCLUSIONS: Serum levels of miR-25 could improve gastric cancer screening, and as the better diagnostic and prognostic marker of gastric cancer.
