LCN2 and type 2 diabetes mellitus: The UACR, eGFR, and tubular injury biomarkers such as urinary kidney injury molecule-1/creatinine (UKIM-1/CR) and urinary neutrophil gelatinase-associated lipocalin/creatinine (UNGAL/CR) are important indicators for assessing renal function and damage in the treatment process of type 2 diabetes patients.