NDRG2 and carcinoma: However, a positive correlation was noted between NDRG2 mRNA expression levels in primary PTC cells and the expression levels of NDRG2 mRNA in metastases of the carcinoma to lymph nodes, what means that the decrease of the NDRG2 mRNA expression level in the primary PTC was accompanied by decreased mRNA expression levels of NDRG2 gene in metastases of the carcinoma to lymph nodes.