Low frequency of epigenetic events in urothelial tumors in young patients

Article

Owen, H., Giedl, J., Wild, P., Fine, S., Humphrey, P., Dehner, L., Amin, M., Epstein, J., Blaszyk, H., Hughes, D., Hartmann, A., Stoehr, R. and Catto, J. 2010. Low frequency of epigenetic events in urothelial tumors in young patients. The Journal of Urology. 184 (2), pp. 459-463. https://doi.org/10.1016/j.juro.2010.03.131
TypeArticle
TitleLow frequency of epigenetic events in urothelial tumors in young patients
AuthorsOwen, H., Giedl, J., Wild, P., Fine, S., Humphrey, P., Dehner, L., Amin, M., Epstein, J., Blaszyk, H., Hughes, D., Hartmann, A., Stoehr, R. and Catto, J.
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.

PublisherElsevier
JournalThe Journal of Urology
ISSN0022-5347
Electronic1527-3792
Publication dates
Online17 Jun 2010
Print01 Aug 2010
Publication process dates
Deposited21 Apr 2016
Accepted01 Jun 2010
Output statusPublished
Digital Object Identifier (DOI)https://doi.org/10.1016/j.juro.2010.03.131
PubMed ID20620398
Web of Science identifierWOS:000279707700011
LanguageEnglish
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