Higashino M, et al. - Researchers gauged the clinical feature of the poorly differentiated thyroid papillary carcinoma. Experts retrospectively investigated thyroid papillary carcinoma patients who underwent initial treatment at the Department during the 13-year period from 2000 to 2012. Careful postoperative follow-up of patients with poorly differentiated carcinoma is important, particularly surveillance of distant metastasis as suggested by the higher relapse rate compared with well-differentiated carcinoma. The higher frequency of local infiltration in patients with poorly differentiated tumors was seen to be a possible reason underlying the disease-specific survival rate, metastasis-free survival rate, and relapse-free survival rate of patients with poorly differentiated carcinoma which was significantly lower in comparison to the patients with well-differentiated carcinoma.