ITGAM and neoplasm: In MOSEC-ID8-bearing mice, macrophages constituted the predominant population of peritoneal myeloid cells, with variable numbers of granulocytic MDSCs and monocytic MDSCs (CD11b+Ly6C+Ly6G−) detected at both early (day 42 after tumor challenge) and advanced (day 90) disease stages (Fig. 1a).