Deming et al. have investigated eight MTNR1A (rs6838290; rs2165667; rs6847693; rs2165666; rs7665392; rs12642043; rs4861722; rs10030173) and four MTNR1B (rs4611171; rs10765576; rs10830962; rs10830963) polymorphisms regarding breast cancer. The gene discussed is MTNR1B; the disease is breast cancer.