NFE2L2 and hearing loss disorder: The pharmacogenomics of cisplatin-induced ototoxicity in individual variability research has shown that the rs6721961 A-allele in promoter sequences results in an approximately 40% reduction in Nrf2 expression, which could therefore protect against cisplatin-induced hearing loss in cancer patients, and this increase in cellular sensitivity to cisplatin is the opposite of that which might have been expected [41].