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Promoter hypermethylation of p16 gene in pre- and post-operative plasma of patients with gastric adenocarcinoma

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Chinese Journal of Cancer Research

Abstracts

Objective: To detect promoter hypermethylation of p16 gene in matched pre- and post-operative plasma of patients with gastric adenocarcinoma for evaluating the effectiveness of therapeutic intervention. Methods: Tissue samples, pre- and post-operative plasma of 84 patients were collected. Plasma of 15 healthy people was collected as control. After sodium-bisulfite treatment, extracted DNA was amplified for p16 promoter by methylation-specific polymerase chain reaction (MSP). The PCR products were detected by both gel-ethidium bromide electrophoresis and high performance liquid chromatogram (HPLC). Results: Among 84 patients, p16 hypermethylation was detected in 26 (31.0%) cancer tissues and 2 (0.02%) tumor-adjacent tissues and 12 (14.3%) pre-operative plasma, while negative in plasma of healthy people. For positive plasma cases, the paired tumor tissues were confirmed to be methylated. Within available 30 pairs of matched pre- and post-operative plasma, 6 pre-operative plasma was positive, and only 1 of 6 plasma remained hypermethylated after surgery. The results detected by HPLC exactly matched those by gel-electrophoresis. Conclusion: The alteration of status of p16 hypermethylation in post-operative plasma is considered the consequences of surgical intervention. Although p16 hypermethylation has no role in pre-operative staging of gastric cancer, detecting hypermethylated p16 in plasma could be utilized in monitoring patients after surgery.

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Correspondence to Ji Jia-fu.

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Foundation item: This work was supported in part by Science Research Foundation of Peking University School of Oncology (00-01 and 04-01).

These two authors contributed equally to this work.

Biography: LIU Ya-hang (1972–), female, master of medicine, Peking University, attending surgeon of the Affiliated Hospital of Inner Mongolia Medical College, majors in surgical oncology; Li Zi-yu (1971–), male, postdoctoral fellow of Peking University, attending surgeon of Beijing Cancer Hospital, majors in surgical oncology.

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Liu, Yh., Li, Zy., Zhang, Lh. et al. Promoter hypermethylation of p16 gene in pre- and post-operative plasma of patients with gastric adenocarcinoma. Chin. J. Cancer Res. 17, 28–34 (2005). https://doi.org/10.1007/s11670-005-0006-5

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  • DOI: https://doi.org/10.1007/s11670-005-0006-5

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