CD8A and neoplasm: We quantified the immune infiltrate of each tumor by flow cytometry: the untreated tumor was infiltrated by 1.9 × 106 lymphocytes and 1 × 106 CD8+ T cells per gram of tissue; the irradiated tumor was infiltrated by 2.7 × 105 and 6.1 × 104 lymphocytes and CD8+ T cells per gram (Figures 2A and 2B).