miR-219–5p was down-regulated in PTC tissue and cells. A, Expression of miR-222, miR-146b, miR-102, miR-34a, miR-26a, and miR-219–5p was detected by qPCR in PTC peritumoral and tumor tissue. Data were normalized to the expression level in peritumoral tissue. B, Expression of miR-219–5p was detected by qPCR in PTC cell lines K1 and W3 and thyroid cell line Nthy-ori 3–1. Data were normalized to the expression level in the Nthy-ori 3–1 cells. *, P < .05.