Figure 1.

Flowchart of the population. Of the 5163 patients treated for thyroid disease in our center, we isolated 112 RAIR patients between January 2012 and December 2016. The control group for comparison consisted of 224 randomly selected patients who underwent postoperative RAI therapy and did not exhibit RAIR cancer. The dose of RAI and value of TSH before RAI in two groups were no differences. DTC, differentiated thyroid carcinoma; IE, imaging examination; LND, lymph node dissection; RAIR, radioiodine refractory; RNT, random number table; TT, total thyroidectomy