Abstract
Purpose
To identify the DNA methylation biomarkers for the detection of the stage I non-small cell lung cancer (NSCLC).
Materials and methods
The methylated state of p16INK4A, ESR1, HOX9, RASSF1A, DAPK1, PTEN, ABCB1, MGMT, APC and MT1G genes that have been reported frequently methylated in lung cancer was determined using methylation-specific PCR in four lung cancer cell lines, 124 cancer tissues of the stage I NSCLC and 26 non-cancerous disease tissues.
Result
The RASSF1A (53/124, 42.74%), APC (49/123, 39.52%), ESR1 (37/124, 29.84%), ABCB1 (31/124, 24.19%, MT1G (25/124, 20.16%) and HOXC9 (17/124, 13.71%) genes were more frequently methylated in the lung tissue from the stage I NSCLC than the non-cancerous lesion patients (2/26, 7.69%, P < 0.01; 2/26, 7.69%, P < 0.01; 2/26, 7.69%, P < 0.05; 1/26, 3.85% P < 0.01; 0/26 0%, P value: <0.01; 0/26, 0%, P < 0.05, respectively). p16INK4A was methylated in 28/124 (22.56%) of cancer tissues and 2/26 (7.69%) of non-cancerous tissues (P value >0.05). No significant association between the methylated state of the genes and the smoking, age or the pathologic types (squamous carcinoma, adenoma and the mixed types) was found. However, p16INK4A methylation was more frequently detected in the male (23/80, 28.75%) than the female (5/44, 11.36%, P > 0.05) patients. MGMT was barely methylated: 1/67, 1.49%), while DAPK1 and PTEN were not at all methylated in the cancer groups.
Conclusions
Methylation analysis in tissue of RASSF1A, APC, ESR1, ABCB1 and HOXC9 genes confirmed 79.8% of the existing diagnosis for the stage I NSCLC at specificity: 73.1%. The insufficiency of predicting disease onset in China, using the previously recommended targets (MGMT, DAPK1 and PTEN) in the United States reflects a potential disease disparity between these two populations. Alternatively, methylated state of this set of genes may be more specific to the late rather than the early stage of NSCLC.
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Abbreviations
- APC:
-
Adenomatous polyposis coli
- DAPK1:
-
Death-associated protein kinase 1
- p16INK4A:
-
Cyclin-dependent kinase inhibitor 2A
- PTEN:
-
Phosphatase and tensin homolog
- RASSF1A:
-
RAS association family 1A
- ABCB1:
-
ATP-binding cassette, subfamily B, member 1
- MGMT:
-
O(6)-methylguanine-DNA-methyltransferase
- ESR1:
-
Estrogen receptor alpha
- HOXC9:
-
Homeobox C9
- MT1G:
-
Metallothionein 1G
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Acknowledgments
This work is supported to J. Zhu by Shanghai Science Foundation grant: 07JC14074, National Science Foundation grants 30570850 and 90919024, National Research Program for Basic Research of China grants 2004CB518804, 2009CB825606 and 2009CB825607, European 6th program grant LSHB-CT-2005-019067 and supported to J. Yu by National Science Foundation grant: 30872963. Thanks are due to Q. Li for the statistic analysis.
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We declare that we have no conflict of interest.
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Q. Lin, J. Geng, K. Ma and J. Yu have contributed equally to this work.
An erratum to this article can be found at http://dx.doi.org/10.1007/s00432-009-0696-z
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Lin, Q., Geng, J., Ma, K. et al. RASSF1A, APC, ESR1, ABCB1 and HOXC9, but not p16INK4A, DAPK1, PTEN and MT1G genes were frequently methylated in the stage I non-small cell lung cancer in China. J Cancer Res Clin Oncol 135, 1675–1684 (2009). https://doi.org/10.1007/s00432-009-0614-4
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DOI: https://doi.org/10.1007/s00432-009-0614-4