To investigate the clinical value of perirenal fat Mayo adhesion probability (MAP) score system in retroperitoneal laparoscopic partial nephrectomy for renal cancer.

The clinical data of 153 patients with renal cell carcinoma who underwent retroperitoneal laparoscopic partial nephrectomy in Department of Urology, Huai'an Hospital Affiliated to Xuzhou Medical University from January 2015 to June 2020 were retrospectively analyzed. According to the MAP score system, they were divided into three groups: low complexity group, moderate complexity group and high complexity group. The operation time, intraoperative blood loss, intraoperative and postoperative complications, intraoperative warm ischemia time, postoperative hospital stay and postoperative serum creatinine were compared among the groups.

Among 153 patients, 68 were in low complexity group, 58 in moderate complexity group and 27 in high complexity group. There was no significant difference in age, gender, preoperative serum creatinine level, tumor diameter, tumor location, body mass index and renal score among the three groups (P>0.05). With the increase of complexity, the operation time and blood loss were also increasing (P<0.05), while the warm ischemia time, postoperative hospital stay and serum creatinine level had no significant change (P>0.05). In terms of intraoperative complications, the incidence of intraoperative complications increased with the increase of complexity (P<0.05), and the risk of postoperative complications in high complexity group was 13.895 times higher than that in low complexity group (P=0.002). The accuracy of MAP scoring system in predicting intraoperative complications was higher (AUC=0.757, P=0.002). However, there was no significant difference in postoperative complications among the groups (P>0.05).

MAP score system in retroperitoneal laparoscopic partial nephrectomy for renal cell carcinoma has good clinical application value in predicting the difficulty of operation and the risk of intraoperative complications.