KITLG and neoplasm: The tumor was also significantly (P < 0.01) lighter in the IRES/GM-SCF-IL-21 group than was found in either the IRES/GM-SCF or IRES/IL-21 groups and was not significantly different (P > 0.05) between either the IRES/GM-SCF group or the IRES/IL-21 group.