RET and thyroid gland undifferentiated (anaplastic) carcinoma: We screened miR-375 expression in B-CPAP (papillary thyroid carcinoma cell line), Nthy-ori 3-1 (normal follicular immortalized thyroid cell line), 8505C (thyroid anaplastic carcinoma cell line) and TT thyroid cell lines (HMTC, RET MEN2A) and showed that miR-375 expression was indeed restricted to the TT cell line (Figure 2).