The clinical and pathological data of small (≤4 cm) clear cell renal cell carcinoma

By reviewing the medical record system, this study recorded the clinicopathological characteristics of the enrolled patients, including age, gender, tumor side, body mass index (BMI), clinical symptoms, distant metastases, preoperative R.E.N.A.L. score[12], and surgical method. Hematological indices included hemoglobin and serum creatinine values. In addition, pathological data included tumor size, pathological grading, TNM stage and the performance of postoperative adjuvant therapy.In order to obtain prognostic information (e.g., survival status, recurrence and metastasis, adjuvant therapy, etc.), patients were followed up postoperatively through outpatient visits or by telephone. The initial follow-up took place 1 month after surgery, with subsequent follow-ups every 6-12 months.