The A allele of rs2297630 was related to the increased production of interleukin 6 (Wang et al., 2019), which was thought to be associated with not only the occurrence of sepsis but also with diabetes mellitus and diabetic retinopathy (Mocan et al., 2006; Chen et al., 2017; Akbari and Hassan-Zadeh, 2018; Yao et al., 2019). Here, IL6 is linked to diabetic retinopathy.