PTCSC1 and thyroid gland papillary carcinoma: The first lncRNAs implicated in thyroid cancer, termed papillary thyroid carcinoma susceptibility candidate 1–3 (PTCSC1, PTCSC2, and PTCSC3), are involved in PTC predisposition and are significantly down-regulated in thyroid tumors, implying roles as tumor suppressors38–40.