Also, in the DFU patients, multivariate unconditional logistic regression was performed with DFO as the dependent variable and sex, age, duration of diabetes, duration of foot ulcer, area of foot ulcer, regular smoking, long-term drinking, mean sunshine duration per day in the recent 3 months, Wagner grade, the severity of wound infection, detection of drug-resistant bacteria, SBP, DBP, FPG, HbA1c, TG, TCH, LDL-C, HDL-C, eGFR, ALB, Hb, TcPO2, ABI, CRP, WBC, ESR, serum 25(OH)VD level, P-IL-6 level, P-IL-10 level, T-IL-6, T-IL-10, and T-VDR expression levels as independent variables. The gene discussed is GSTM1; the disease is diabetes mellitus.