ITGAM and neoplasm: The amount of CD11b+GR1+ MDSC in the bone marrow (Fig. 1A) and peripheral blood were much lower (Fig. 1B) and significantly decreased in the spleen (Fig. 1C) and tumour (Fig. 1D) of carbon ion-irradiated animals compared to the X-ray irradiated and non-irradiated B16 melanoma-bearing mice.