Renal carcinoma is the 20th most common cancer worldwide. Clear cell renal cell carcinoma is the most frequent type of renal cancer. Even in patients diagnosed at an early stage, characteristics of disease progression remain heterogeneous. Up-to-date molecular classifications stratify the ccRCC samples into two clusters. We analyzed gene expression in 23 T1 or T3 ccRCC samples. Unsupervised clustering divided this group into three clusters, two of them contained pure T1 or T3 samples while one contained a mixed group. We defined a group of 36 genes that discriminate the mixed cluster. This gene set could be associated with tumor classification into a higher stage and it contained significant number of genes coding for molecular transporters, channel and transmembrane proteins. External data from TCGA used to test our findings confirmed that the expression levels of those 36 genes varied significantly between T1 and T3 tumors. In conclusion, we found a clustering pattern of gene expression, informative for heterogeneity among T1 and T3 tumors of clear cell renal cell carcinoma.
PloS one. 2019 May 31*** epublish ***
Agnieszka M Borys, Michał Seweryn, Tomasz Gołąbek, Łukasz Bełch, Agnieszka Klimkowska, Justyna Totoń-Żurańska, Julita Machlowska, Piotr Chłosta, Krzysztof Okoń, Paweł P Wołkow
Center for Medical Genomics OMICRON, Medical Faculty, Jagiellonian University Medical College, Krakow, Poland., Chair and Department of Urology, Medical Faculty, Jagiellonian University Medical College, Krakow, Poland., Chair of Pathomorphology, Medical Faculty, Jagiellonian University Medical College, Krakow, Poland.