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.

本研究通过回顾病历系统，记录纳入患者的临床病理特征，包括年龄、性别、肿瘤侧别、体质量指数（Body Mass Index, BMI）、临床症状、远处转移、术前R.E.N.A.L.评分[12]及手术方式。血液学指标包括血红蛋白与血清肌酐水平。此外，病理资料涵盖肿瘤大小、病理分级、TNM分期以及术后辅助治疗实施情况。为获取患者的预后信息（如生存状态、复发转移情况、辅助治疗情况等），本研究于术后通过门诊随访或电话随访对患者进行随访。首次随访于术后1个月开展，后续随访间隔为6~12个月。