Also, Kheyami’s study [37] demonstrated that vitamin D receptor (VDR) expression is increased in diabetic neuropathy patients and the VDR up-regulation is associated with the severity of neuropathy and peroneal nerve conduction velocity, but there is no difference in VDR expression between painless neuropathy and painful neuropathy as demonstrated by this study. The gene discussed is VDR; the disease is diabetic neuropathy.