Differential NDRG2 mRNA expression and CpG-hypermethylation levels between luminal- and basal-like or triple negative breast cancers animated us to investigate NDRG2 protein expression in normal and malignant breast tissue using a TMA containing 161 invasive breast carcinomas and 50 normal breast tissue samples. The gene discussed is NDRG2; the disease is triple-negative breast carcinoma.