Feasibility and Outcomes of Partial Nephrectomy for Resection of at Least 20 Tumors in a Single Renal Unit

Purpose: Patients with hereditary renal cancer are at increased risk for recurrent bilateral multifocal tumors and may require aggressive nephron sparing surgery to prevent renal replacement therapy. We evaluated feasibility and outcomes in patients who underwent partial nephrectomy with removal of at least 20 tumors in a single renal unit at 1 setting. Materials and Methods: We retrospectively reviewed the records of 30 patients who underwent a total of 34 partial nephrectomies with removal of at least 20 tumors at our institution from 1993 to 2008. Operative reports and hospital records were reviewed for perioperative data, and renal functional and oncologic outcomes. We compared preoperative and postoperative renal function with the 2-tailed t test. Results: There were no deaths and only 1 renal unit was lost. A median of 26.5 tumors was removed. Median estimated blood loss was 3,500 ml and median operative time was 9 hours. Perioperative complications developed in greater than 50% of cases. There was a statistically significant decrease in the estimated glomerular filtration rate at 3 months (67 vs 59 ml/minute/1.73 m(2), p < 0.001). Only 1 patient had metastatic disease. Eight of the 34 operated kidneys required subsequent intervention during the median followup of 52 months (range 4 to 187). Conclusions: Aggressive partial nephrectomy to resect multiple tumors is technically feasible. There was a significant decrease in postoperative renal function but more than 80% of preoperative renal function was preserved in this cohort except in 1 patient. Also, oncologic outcomes were encouraging at intermediate term followup.