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Selmansberger, M. ; Braselmann, H. ; Hess J. ; Bogdanova, T.* ; Abend, M.* ; Tronko, M.* ; Brenner, A.* ; Zitzelsberger, H. ; Unger, K.

Genomic copy number analysis of Chernobyl papillary thyroid carcinoma in the Ukrainian-American Cohort.

Carcinogenesis 36, 1381-1387 (2015)

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One of the major consequences of the 1986 Chernobyl reactor accident was a dramatic increase in papillary thyroid carcinoma (PTC) incidence, predominantly in patients exposed to the radioiodine fallout at young age. The present study is the first on genomic copy number alterations (CNAs) of PTCs of the Ukrainian American cohort (UkrAm) generated by Array Comparative Genomic Hybridization (aCGH). Unsupervised hierarchical clustering of CNA profiles revealed a significant enrichment of a subgroup of patients with female gender, long latency (> 17 years) and negative lymph node status. Further, we identified single CNAs that were significantly associated with latency, gender, radiation dose and BRAF status. Multivariate analysis revealed no interactions but additive effects of parameters gender, latency and dose on CNAs. The previously identified radiation-associated gain of the chromosomal bands 7q11.22-11.23 was present in 29% of cases. Moreover, comparison of our radiation-associated papillary thyroid carcinoma (PTC) data set with the TCGA data set on sporadic PTCs revealed altered copy numbers of the tumor driver genes NF2 and CHEK2. Further, we integrated the CNA data with transcriptomic data that were available on a subset of the herein analyzed cohort and did not find statistically significant associations between the two molecular layers. However, applying hierarchical clustering on a "BRAF-like/RAS-like" transcriptome signature split the cases into four groups, one of which containing all BRAF-positive cases validating the signature in an independent data set.

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