FOXP3 and small cell lung carcinoma: Interestingly, FOXP3 level on TILs was significantly correlated with RFS status in SCLC, and the positive group showed longer RFS compared with the negative group (41.200 months, 95% CI 26.937 to 55.463, vs 14.000 months, 95% CI 8.133 to 19.867; p=0.008; figure 2A).