The ratios of tumor-infiltrated immune cells to total cell count in WT, KO host, and spontaneous Stat1-null tumors were 8%, 4.5%, and 2.2%, respectively, for CD3+ T lymphocytes and 0.77%, 0.24%, and 0.23% for F4/80 macrophages, respectively. This evidence concerns the gene STAT1 and neoplasm.