Objective:In recent years,the prevalence of diabetic nephropathy(DN)has increased significantly.An increasing number of studies have shown that lymphocyte-associated inflammatory responses play a role in DN.This study aims to investigate the relationship between lymphocytes and DN in patients with autoimmune diabetes. Methods:The clinical data of 226 patients with Type 1 diabetes(T1D)and 79 patients with latent autoimmune diabetes in adults(LADA)were retrospectively studied and stratified according to the urinary albumin to creatinine ratio(ACR).Risk factors associated with DN were analyzed using correlation analysis and logistic regression. Results:In T1D and LADA patients,systolic blood pressure(SBP),uric acid duration,and diabetes duration in patients with normoalbuminuria were lower or shorter than those in patients with macroalbuminuria(P＜0.05).The lymphocyte count of T1D patients was significantly higher than that in LADA patients(P＜0.05),while the neutrophil to lymphocyte ratio(NLR)of T1D patients was significantly lower than that in LADA patients(P＜0.05).The lymphocyte count in the T1D patients with normoalbuminuria was lower than that those with macroalbuminuria(P＜0.05).The NLR was lower in the T1D patients with macroalbuminuria than those with microalbuminuria and normoproteinuria(all P＜0.01).Based on logistic regression analysis,lymphocytes were independently associated with DN in T1D after adjusting for various known risk factors such as course of disease,age,gender,dyslipidemia,hypertension,and smoking status.Analysis of the receiver operating characteristic curve of subjects predicting lymphocytes in normoalbuminuria showed that the area under the curve was 0.601(95% CI 0.510 to 0.693,P=0.039),and when the cutoff value of lymphocytes was 2.332,the sensitivity was 37.0%,and the specificity was 82.5%. Conclusion:Lymphocyte counts in autoimmune diabetic patients are closely associated with DN,suggesting that lymphocyte-mediated inflammation may be involved in the pathogenesis of DN in autoimmune diabetic patients.This study provides a possible perspective for using lymphocytes as a potential biomarker for the early identification of individuals at risk for DN and potential therapeutic targets for DN.