A Cohort Study on Prediction of Malignant Transformation of Oral Epithelial Dysplasia by p16 Methylation
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 发起方
- 入组人数
- 93
- 试验地点
- 1
- 主要终点
- The Number of Participants With Both Clinical and Histological Evidence of Malignant Transformation of Oral Epithelial Dysplasia
研究概览
简要总结
Oral epithelial dysplasia (OED) is one of the common precancerous lesions among Chinese adults. Biomarker is not available for detection of malignant potential of OED till now. p16 is an important tumor suppressor gene, which is inactivated frequently by methylation of CpG island in early stage of carcinogenesis. The present cohort study is to investigate whether p16 methylation is correlated with malignant transformation of OED.
详细描述
- Background: Identification of malignant potential of oral epithelial dysplasia (OED) is virtually impossible on histopathological grounds alone. Inactivation of p16 gene by CpG methylation is an early frequent event during oral carcinogenesis. To investigate the predictive value of p16 methylation on malignant potential in OED, we carried out the prospective cohort study.
- Methods: 101 patients with histologically confirmed mild or moderate OED were included in the present study. Baseline information of p16 methylation status of the OED lesions from 93 cases was obtained by methylation-specific PCR. Progression of the OEDs lesions was examined in 78 cases histologically during the 45.8 months double-blind followup survey (78/93). The association between p16 methylation and progression of OED was analyzed with SPSS13.0 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 mild or moderate grade OED; and
- •enough amount of tissue sample from OED lesion for genomic DNA extraction; and
- •available of methylation status of p16 CpG island in the extracted DNA sample.
排除标准
- •histological diagnosis of severe grade OED or malignant disease; or
- •amount of tissue sample is not enough for preparation of genomic DNA (20ng); or
- •quality of the prepared DNA is not good enough for detection of p16 methylation; or
- •OED treatment history by LASER, radiotherapy, or chemotherapy
结局指标
主要结局
The Number of Participants With Both Clinical and Histological Evidence of Malignant Transformation of Oral Epithelial Dysplasia
时间窗: from 3 months to 124 months
The follow-up examination was carried out with a 3-month interval. Re-biopsy was done as clinically indicated, e.g. the lesion recurs or has tendency for malignant development. Pathologic diagnosis was made by at least two pathologists without the knowledge of baseline p16 methylation, based on the World Health Organization's criteria, at Peking University School of Stomatology. The number of participants with malignant transformation of oral dysplasia was calculated based on the number of participants with oral dysplasia progressed to carcinoma by the end of the trial in each cohorts.
次要结局
- Cancer-free Survival Time for Patients With Oral Epithelial Dysplasia(from 3 months to 124 months)
研究者
Dajun Deng
Professor and Department Director
Peking University