2.1. Differential Regulation of Low-Density Lipoprotein Receptor (LDLR) Protein Expression and Low-Density Lipoprotein (LDL) Uptake in Papillary Thyroid Carcinoma (PTC) Cell Lines with Different Mutational Status after LDL Incubation. Here, LDLR is linked to thyroid gland papillary carcinoma.