Previous studies reported that muscle regeneration is delayed in tumour‐bearing mice.7, 8 On the other side, IL4 treatment was reported to improve muscle regeneration in glycerol‐injured animal model.17, 27 Along this line, the myogenic response following CTX‐induced muscle injury in the C26 hosts, in the presence or in the absence of IL4 treatment, was assessed. This evidence concerns the gene IL4 and neoplasm.