[CLINICAL FEATURES OF 15 PATIENTS UNDER SURVEILLANCE FOR RENAL MASSES].

(Objective) We investigated the clinical features of patients under surveillance for localized renal masses. (Methods) This study was a retrospective analysis of 15 patients who were diagnosed as having clinically localized renal cell carcinoma and were placed under surveillance and 68 patients who underwent immediate radical operation for renal masses. (Results) The age at diagnosis in the surveillance group was significantly higher than in the immediate operation group (median, 81 vs. 65 years, respectively, P<0.01). The Charlson Comorbidity Index in the surveillance group was significantly higher than in the immediate operation group (median, 5 vs. 2, respectively, P<0.01) and 10 patients (67%) had complications, which was one of the reasons for surveillance. The median initial tumor size in the surveillance group was 2.5 cm (1.5-10.1). There was no significant difference in the tumor size between the two groups. During a median follow-up of 19 months (6-55) the median tumor growth rate was 0.29 cm per year (-0.19-0.65) in the surveillance group. Of the 15 patients with computed tomography follow-up, four underwent surgical resection of the renal masses after surveillance. The histological diagnosis was clear cell renal cell carcinoma in all four. During follow-up, two patients died of other causes and one patient had bone metastasis but there was no death related to the renal masses in the surveillance group. (Conclusions) The appropriateness of the surveillance should be considered when we initiate surveillance for patients with renal masses because metastasis was detected in one patient in this study. On the other hand, surveillance may be an acceptable management method for elderly or severely comorbid patients because there were two deaths from other causes in the surveillance group.