In one of the studies conducted in a Polish population, involving mutations and polymorphisms within the MT-ND1, MT-ND-2, MT-ND3, and MT-ND6 genes in breast cancer cells, there were 28 polymorphisms, mostly located within the MT-ND-2 gene, that were absent from healthy cells [70]. The gene discussed is MT-ND2; the disease is breast carcinoma.