FOXP3 and small cell lung carcinoma: In a retrospective SCLC study, FOXP3+TILs were an independent positive prognostic factor in patients with non-metastatic SCLC at stage I–III, but not in metastatic patients.64 Our study also exhibited a positive association of FOXP3 with prognosis among patients with surgically resected SCLC at stage I–III.