Before revision:  For any given tissue, the cancer state is a kind of attractor in the gene expression state space with at least 2500 highly differentially-expressed genes and a power-like tail in the expression distribution function.
After revision:  For any given tissue, the cancer state is a kind of attractor in the gene expression state space with at least 2500 highly differentially-expressed genes , which lead to power-like tail in the expression distribution function.