CD4 and cancer: Among 109 NSCLC specimens, the mean number of infiltrating CD8+ T cells in cancer stroma was 152±107 (median 148, range 6–566), that of CD8+ T cells within cancer nests was 14±25 (median 2, range 0–121) and that of CD4+ T cells in cancer stroma was 169±152 (median 134, range 0–626).