A Cohort Study on Prediction of Metastasis of Gastric Carcinoma by DNA Methylation Biomarkers
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 198
- 试验地点
- 1
- 主要终点
- Metastasis and/ or recurrence of gastric carcinoma
研究概览
简要总结
Gastric carcinoma (GC) is the second leading cause of cancer death throughout the world. In previous multi-center study, we have found that the prevalence of GDNF family receptor alpha 1(GFRA1), serum response factor (SRF), and ZNF382 methylation alterations were inversely and coordinately associated with GC metastasis and the patients' overall survival throughout discovery and testing cohorts in China, Japan and Korea. The present cohort study is to investigate whether methylation of those genes can predict the metastasis and prognosis of GC.
详细描述
Background: Metastasis is the leading cause of death for gastric carcinoma (GC). Currently, GC prognosis is primarily determined based on the clinical data and pathological stages of patients at the time of diagnosis and treatment. However, successful management of GC patients is still hampered by lack of highly sensitive and specific biomarkers capable of predicting prognosis and likelihood of metastasis. GFRA1 hypomethylation along with SRF and ZNF382 hypermethylation were found to be potential synergistic biomarkers for the prediction of GC metastasis in our previous multi-center study. In addition, p16 and E-cadherin were also correlated with GC metastasis in Chinese cohort. To investigate the predictive value of those genes' methylation on metastasis potential in GC, we carried out the prospective cohort study.
Methods: 198 early stage GC patients without lymph node or distal metastasis were included in the present study. Baseline information of E-cadherin, GFRA1, p16, SRF and ZNF382 methylation status of the GC from 191 cases was obtained by MethyLight. The follow-up examination was carried out in a double-blind study with a 6-month interval. The association between gene methylation and metastasis of GC was analyzed with SPSS16.0 software. All P-values were two-sided.
研究设计
- 研究类型
- Observational
- 观察模型
- Cohort
- 时间视角
- Prospective
入排标准
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Histological diagnosis of gastric adenocarcinoma;
- •Early stage GC without lymph node and distal metastasis;
- •Availability of frozen, fresh GC and corresponding surgical margin samples;
- •Available of methylation status of gene CpG island in the extracted DNA sample.
排除标准
- •GC with lymph node or distal metastasis;
- •Quality of the prepared DNA is not good enough for detection of gene methylation;
- •GC cases were subjected to the neoadjuvant chemotherapy.
结局指标
主要结局
Metastasis and/ or recurrence of gastric carcinoma
时间窗: 3 years
The hazard ratio, positive prediction value, and negative prediction value of metastasis/recurrence of gastric carcinomas are calculated according to the metastasis/recurrence frequences among patients with the different methylation status of each target gene CpG islands. These patients are classified into four groups for each gene: A) cases without methylation change; B) cases with the low-level of methylation change (33.3% of cases with methylation change); C) cases with the middle-level of methylation change (33.3% of cases with methylation change); D) cases with the high-level of methylation change (33.3% of cases with methylation change). Combination analysis will be carried out using Support Vector Classification model.
次要结局
- Disease-free (Recurrence/metastasis-free) survival (DFS) and overall survival (OS) of patients with gastric carcinoma after surgical resection(from 4 months to 144 months)
研究者
Zhaojun Liu
Zhaojun Liu
Peking University Cancer Hospital & Institute