What Is New? 
Our study suggested that the significant predictive factor for renal preservation is the volume of the preserved parenchyma and the radical nephrectomy is the worse predictive factor. However, our study also showed that the dialysis rate, which impairs patients’ quality of life, was similar between the two groups in the long-term follow-up. Our study also demonstrated that the age, gender, and presence of comorbidities, including coronary artery disease, diabetes, and hypertension, had no adverse impacts on the changes in the eGFR. Another important finding of our study is that the parenchymal quality is another critical factor for GFR change. Our study showed that GFR change was more significant in patients who had any level of kidney disease (preoperative GFR below 90 ml/min/1.73 m2).