Moreover, there was a discrepancy compared to previous studies; another course-based study (18) identified the change rate of TSH-suppressed Tg (DTgon%) of 8.1 and maximum target/background ratio on WBS (T/Bmax) of 25.3% as predictors for biochemical response to next RAI treatment in DTC lung metastasis. This evidence concerns the gene TG and metastasis.