EPO and diabetes mellitus: When combining PDR with ESRD within the mixed types of diabetes in the European population, the effect of rs1617640 at EPO gene was regarded as highly credible under the allelic model (T vs. G), dominant model (TT + TG vs. GG), recessive model (TT vs. TG + GG), and homozygous model (TT vs. GG) (Table 2) [21].