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Promoter methylation of WNT inhibitory factor-1 may be associated with the pathogenesis of multiple human tumors

1 Department of General Surgery, The Second Hospital of Shandong University, Jinan 250033, P. R. China
2 Department of Medical Imaging, The Second Hospital of Shandong University, Jinan 250033, P. R. China

Correspondence Address:
Jianliang Zhang,
Department of General Surgery, The Second Hospital of Shandong University, No. 247, North Park Street, Tianqiao District, Jinan 250033, P. R. China

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Source of Support: None, Conflict of Interest: None

Aim: We investigated the association of WNT inhibitory factor-1 (WIF-1) gene methylation with the pathogenesis of multiple human tumors, using a meta-analysis based approach. Materials and Methods: Electronic databases and manual search was additionally employed to retrieve relevant published literature. The cohort studies relating to tumor and WIF-1 were screened based on predefined selection criteria, and all extracted data from the selected studies were analyzed through STATA software. Results: Sixteen studies were finally enrolled in our study involved 1112 tumor samples and 612 adjacent normal samples. The study result showed that WIF-1 gene methylations in tumor tissues were significantly higher compared with adjacent/normal tissues. The result of subgroup analysis on ethnicity revealed that in the Caucasians, Asians, and Africans, the methylation status of WIF-1 gene in tumor tissues was higher than adjacent/normal tissues. Further subgroup analysis on disease types revealed that WIF-1 gene methylation status is a widespread phenomenon that is, observed in tumor tissues of patients with multiple human tumors compared with that in adjacent/normal tissues. Interestingly, there was no significant difference in WIF-1 gene methylation between tumor tissues among patients with lung cancer, gastric cancer, astrocytoma, and adjacent/normal tissues, indicating the WIF-1 gene methylation not a general nonspecific phenomenon. Conclusion: WIF-1 gene methylation in tumor tissues was significantly more frequent as compared to that in adjacent normal tissues, indicating that WIF-1 gene methylation may be an important event in the pathogenesis of multiple human tumors.

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