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Elevated DNA methylation in malignant tumors of the sinonasal tract and its association with patient survival

M. Chmelarova, J. Laco, H. Kovarikova, I. Baranova, P. Dundr, K. Nemejcova, J. Michalek, M. Vosmik, V. Palicka

. 2018 ; 162 (3) : 232-238. [pub] 20180327

Language English Country Czech Republic

Document type Journal Article

Persistent link   https://www.medvik.cz/link/bmc19003015

BACKGROUND: Epigenetic modifications have been recognized as an important mechanism underlying carcinoma progression. DNA methylation plays an important role in cancer biology and represents potentially heritable changes in gene expression that do not involve DNA sequence. The aim of this study was to investigate promoter methylation of selected genes in sinonasal carcinoma by comparison with noncancerous sinonasal tissue. METHODS: To search for epigenetic events (methylation in 25 tumor suppressor genes) we used MS-MLPA (Methylation-specific multiplex ligation-dependent probe amplification) to compare methylation status of 59 formalin fixed, paraffin embedded tissue samples of sinonasal carcinomas with 18 control samples. The most important changes in methylation were confirmed using MSP (Methylation specific PCR). Detected alterations in methylation were compared with clinicopathological characteristics. RESULTS: Using a 20% cut-off for methylation (MS-MLPA), we found significantly higher methylation in GATA5 (P=0.0005), THSB1 (P=0.0002) and PAX5 (P=0.03) genes in the sinonasal cancer group compared to the control group. Methylation in five or more genes was associated with impaired overall survival (P=0.017). CONCLUSION: These findings provide evidence that alterations in methylation profile may be one of the major mechanisms in sinonasal carcinogenesis. In addition, changes in methylation could potentially be used as prognostic factors of sinonasal carcinoma and may have implications for future individualized therapy based on epigenetic changes.

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$a BACKGROUND: Epigenetic modifications have been recognized as an important mechanism underlying carcinoma progression. DNA methylation plays an important role in cancer biology and represents potentially heritable changes in gene expression that do not involve DNA sequence. The aim of this study was to investigate promoter methylation of selected genes in sinonasal carcinoma by comparison with noncancerous sinonasal tissue. METHODS: To search for epigenetic events (methylation in 25 tumor suppressor genes) we used MS-MLPA (Methylation-specific multiplex ligation-dependent probe amplification) to compare methylation status of 59 formalin fixed, paraffin embedded tissue samples of sinonasal carcinomas with 18 control samples. The most important changes in methylation were confirmed using MSP (Methylation specific PCR). Detected alterations in methylation were compared with clinicopathological characteristics. RESULTS: Using a 20% cut-off for methylation (MS-MLPA), we found significantly higher methylation in GATA5 (P=0.0005), THSB1 (P=0.0002) and PAX5 (P=0.03) genes in the sinonasal cancer group compared to the control group. Methylation in five or more genes was associated with impaired overall survival (P=0.017). CONCLUSION: These findings provide evidence that alterations in methylation profile may be one of the major mechanisms in sinonasal carcinogenesis. In addition, changes in methylation could potentially be used as prognostic factors of sinonasal carcinoma and may have implications for future individualized therapy based on epigenetic changes.
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$a Laco, Jan, $u The Fingerland Department of Pathology, Charles University, Faculty of Medicine in Hradec Kralove and University Hospital Hradec Kralove, Czech Republic. $d 1979- $7 xx0051050
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$a Dundr, Pavel, $u Department of Pathology, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Czech Republic. $d 1971- $7 xx0080436
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$a Němejcová, Kristýna $7 xx0233214 $u Department of Pathology, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Czech Republic.
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$a Palička, Vladimír, $u Institute for Clinical Biochemistry and Diagnostics, Charles University, Faculty of Medicine in Hradec Kralove and University Hospital Hradec Kralove, Czech Republic. $d 1946- $7 jn99240000830
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