Characteristics of the 101 ccRCC patients from the “K2 study” (Czech Republic) included in the whole-genome gene expression microarray study.

*p value calculated using Pearson χ2 testing for categorical variables and t-test for continuous variables.**The two younger categories were grouped.***All stage IV patients had distant metastasis at diagnosis, and by definition none of stage I, II or III patients had distant metastasis. Missing stages were due to the lack of lymph nodes and/or metastasis evaluation. Out of 19 cases with missing stage, 9 were pT1a, 7 were pT1b, 1 was pT2a, and 1 was pT3a.