Parenchymal sparing surgery in patients with hereditary renal cell carcinoma: 10-year experience.

PURPOSE von Hippel-Lindau disease, hereditary papillary renal cell carcinoma, the Birt-Hogg-Dubé syndrome and familial renal oncocytoma are familial renal tumor syndromes. These hereditary disorders are noteworthy for the development of multiple bilateral renal tumors and the risk of new tumors throughout life. One management strategy is observation of solid renal tumors until reaching 3 cm, then performing parenchymal sparing surgery. We present a 5-year update on our experience. MATERIALS AND METHODS From May 1988 to October 1998, 49 patients with hereditary renal cell carcinoma, including von Hippel-Lindau disease in 44, hereditary papillary renal cell carcinoma in 4 and the Birt-Hogg-Dubé syndrome in 1, and 1 with familial renal oncocytoma underwent exploration to attempt renal parenchymal sparing surgery. Patients were followed prospectively with periodic screening for recurrence, metastasis and loss of renal function. Median followup was 79.5 months (range 0.7 to 205). RESULTS A total of 50 patients underwent 71 operations resulting in unilateral nephrectomy in 6, bilateral nephrectomy in 1 and partial nephrectomy in 65, with 1 to 51 tumors removed from each kidney (mean 14.7). Mean patient age was 39.5 years (range 18 to 70). Of the 65 (40%) partial nephrectomies 26 were performed with cold renal ischemia. Mean blood loss was 2.9 +/- 0.5 l (range 0.15 to 23). Postoperative complications included renal atrophy in 3 patients. Mean preoperative serum creatinine was 1.05 +/- 0.03 mg/dl (range 0.6 to 1.8), and postoperative creatinine was 1.06 +/- 0.04 mg/dl (range 0.6 to 2.0). No patient who underwent renal parenchymal sparing surgery required renal replacement therapy. Metastatic disease developed in 1 patient with a 4.5 cm renal tumor. CONCLUSIONS Parenchymal sparing surgery with a 3 cm threshold in patients with hereditary renal cancer appears to be an effective therapeutic option to maximize renal function while minimizing the risk of metastatic disease.