PTPRC and neoplasm: Increased infiltration of the peritumoral stroma by macrophages and granulocytes (CD11b+), leukocytes (CD45+), and T cells (CD3+) seen in our data correlated with reduced SCC tumor size and reduced tumor cell proliferation in p38δ-cKOΔM male mice compared to their WT counterparts (Figure 4C–F).