FOXP3 and hematocrit: Our study showed a significant correlation between PTC alone and PTC with concomitant HT and FOXP3 expression with the number of radioactive iodine doses and the cumulative radioiodine doses (p = 0.042 and < 0.001, respectively).This may be attributed to the association between FOXP3 expression and unfavorable prognostic factors that have a specific impact on radioiodine sensitivity.