Mechanistically, RK reduced circulating interleukin‐6 (IL‐6) concentrations from 334 ± 151 to 164 ± 123 pg/mL (P = 0.047) in C26 and from 93 ± 39 to 35 ± 6 pg/mL (P = 0.0053) in CHX207 tumour‐bearing mice. This evidence concerns the gene IL6 and neoplasm.