of artificial analysis of the data, to derive our colle lusions. High, moderate, and poor rates of cell proliferation were basedon an unbiased evaluation of the tertiles of a group of 56 RCC as compared to proliferation status of a reference tumorpopulation. At such a formative stage of development, we did not evaluate proliferation as a continuous variable for anysingle gene or the mean rank of 10 genes, but this is a factor that will need to evaluated further in future studies.