Cytokine levels in serum from tumor-free rats and rats with similar sized subcutaneous G- or MLL-tumors (1.6 ± 0.5 g, and 1.9 ± 0.5 g, respectively, mean tumor weight ± SEM, p = 0.700, Mann–Whitney U test) were determined semi quantitatively using a Rat XL cytokine array. This evidence concerns the gene KMT2A and neoplasm.