Low frequency of epigenetic events in urothelial tumors in young patients

Owen, Helen C. and Giedl, J. and Wild, Peter J. and Fine, Samson W. and Humphrey, Peter A. and Dehner, Louis P. and Amin, Mahul B. and Epstein, Johnathan I. and Blaszyk, H. and Hughes, David and Hartmann, Arndt and Stoehr, Robert and Catto, James W. (2010) Low frequency of epigenetic events in urothelial tumors in young patients. The Journal of urology, 184 (2). pp. 459-463. ISSN 1527-3792

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Abstract

PURPOSE

Bladder urothelial cell carcinoma is uncommon in young patients. We recently reported a series of tumors in patients younger than 20 years at diagnosis and performed exhaustive genetic screening for molecular alterations. Few events typical of bladder urothelial cell carcinoma were detected. Since many carcinogenic events occur at the epigenetic rather than the genetic level, we analyzed the same tumors for alterations in DNA hypermethylation. We compared our findings with those in tumors in older patients with similar pathological profiles.

MATERIALS AND METHODS

We analyzed 76 bladder urothelial cell carcinomas from 3 groups stratified by age at diagnosis, including less than 19, 20 to 45 and greater than 46 years (median 78), and matched for low grade and nonmuscle invasive stage. We used quantified methyl specific polymerase chain reaction to investigate promoter methylation for 8 tumor suppressor genes implicated in urothelial carcinogenesis.

RESULTS

Tumors in the youngest age group had the lowest incidence of global hypermethylation compared to the other tumors with a methyl index of 37.5% vs 62.5% and 50%, respectively (ANOVA p = 0.009). When individual loci were analyzed, younger patients had a significantly lower rate and concentration of methylation at APC, Bcl2, MGMT and E-cadherin promoters than in the older groups (p <0.05). Few differences were present between the 2 older cohorts but the APC and MGMT methylation concentration increased with age.

CONCLUSIONS

Urothelial tumors in patients younger than 19 years have a low rate of epigenetic alteration. Tumors in patients older than 20 years have epigenetic profiles similar to those of tumors in patients within the typical bladder urothelial cell carcinoma age range.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 19104
Useful Links:
Depositing User: Helen Roberts
Date Deposited: 21 Apr 2016 10:12
Last Modified: 11 May 2017 14:38
URI: http://eprints.mdx.ac.uk/id/eprint/19104

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