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Frequent 3p21 allelic loss and methylation-associated RASSF1A inactivation in non-small cell lung cancer and its clinical implication

  • Published:
Wuhan University Journal of Natural Sciences

Abstract

A total of 110 primary NSCLCs (non-small cell lung cancers) were recruited in this study to characterize the pattern of 3p21 LOH together with the RASSF1A methylation status and their clinical implication. 3p21 LOH by 8 microsatellite markers, RASSF1A methylation status by methylation-specific PCR (MSPCR) as well as bisulfite genomic sequencing (BGS), and RASSF1A expression level by real-time quantitative PCR was performed. 3p21 LOH is frequent in NSCLC with a mean frequency of (41.2±3.7)%. Significant associations between 3p21 LOH and gender, smoking history, histological type, and tumor size were observed. Cases with LOH have a slightly lower RASSF1A expression than cases without LOH but not statistically significant. Comparison of RASSF1A methylation that resulted from the three analyses shows significant correlations from one another. Higher frequency of methylation was observed in larger tumors and in smokers compared with smaller tumors and non-smokers, respectively. A significant correlation was also observed in extent between methylation and RASSF1A expression, illustrating that epigenetic mechanism could affect gene expression. The significant clinicopathological relations of 3p21 LOH may be of great use for both early detection and therapeutic interventions.

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Authors and Affiliations

  1. Department of Pathology, Beijing Friendship Hospital, Capital Medical University, Beijing, 100050, China

    Hong Zhu

  2. Department of Pathology, Hong Kong University, Hong Kong, China

    Maria P. Wong

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  1. Hong Zhu
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  2. Maria P. Wong
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Correspondence to Hong Zhu.

Additional information

Foundation item: Supported by grants from the Research Grants Council of the Hong Kong Special Administrative Region (HKU7310/01M, 7486/03M, 7468/04)

Biography: ZHU Hong (1970–), female, attending doctor, Ph. D., research direction: molecular genetics of lung cancer.

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Zhu, H., Wong, M.P. Frequent 3p21 allelic loss and methylation-associated RASSF1A inactivation in non-small cell lung cancer and its clinical implication. Wuhan Univ. J. Nat. Sci. 14, 457–464 (2009). https://doi.org/10.1007/s11859-009-0517-x

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  • DOI: https://doi.org/10.1007/s11859-009-0517-x

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