STAT1 and head and neck squamous cell carcinoma: Notably, we observed a significant decrease in Ly6Chi Ly6G− cells, but not Ly6Cint Ly6G+ cells, in the lymph nodes and spleens of carcinogen induced Stat1-deficient mice, which is another population we previously observed to accumulate in Stat1-deficient mice bearing Stat1-competent aggressive HNSCC.