title: Renal function adaptation in children with unilateral renal tumors treated with nephron sparing surgery or nephrectomy.
abstract: OBJECTIVE
  We studied the natural history of renal function following removal of different amounts of renal mass in a cohort of children with unilateral renal tumors.
  
  
  METHODS
  We compared kidney function and blood pressure before and after surgery in 26 patients with unilateral renal tumors treated with nephrectomy (group 1, 16 patients) or nephron sparing surgery (group 2, 10 patients). Serum creatinine and blood pressure measurements were indexed to age and sex, and expressed as standard deviation scores (SDSs). Values were means +/- SD.
  
  
  RESULTS
  Preoperatively, patients in group 1 had no significant differences with respect to serum creatinine SDS and blood pressure SDS compared to patients in group 2. At a mean cross-sectional followup of 72 and 65 months, respectively, patients in group 1 had higher serum creatinine SDS compared to those in group 2 (1.27 +/- 0.69 vs 0.70 +/- 0.49, p = 0.02), as well as higher systolic blood pressure SDS (0.72 +/- 0.74 vs -0.10 +/- 0.92, p = 0.01) and higher diastolic blood pressure SDS (0.87 +/- 0.77 vs 0.19 +/- 0.62, p = 0.01). Serum creatinine SDS and systolic blood pressure SDS had a significant positive correlation (r = 0.44, p = 0.02). A postoperative longitudinal study of all patients showed a progressive increase in serum creatinine SDS with increasing followup time (r 0.49, p = 0.02). The slope of regression line was sustained by a steep increase of serum creatinine SDS in 5 patients in group 1 and 2 patients in group 2.
  
  
  CONCLUSIONS
  In children with unilateral renal tumors nephron sparing surgery minimizes the decrease in renal function following renal ablative surgery, and may be of benefit in children with a progressive renal function decrease, probably due to a congenitally reduced nephron complement.
authors.affiliation: Pediatric Surgery Unit, University of Rome La Sapienza, Rome, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Cozzi
authors.forename: Amalia
authors.initials: A
authors.lastname: Schiavetti
authors.forename: Francesco
authors.initials: F
authors.lastname: Morini
authors.forename: Augusto
authors.initials: A
authors.lastname: Zani
authors.forename: Marco
authors.initials: M
authors.lastname: Gambino
authors.forename: Chiara
authors.initials: C
authors.lastname: Donfrancesco
authors.forename: Denis A
authors.initials: DA
authors.lastname: Cozzi
mesh_terms: D000222:Adaptation, Physiological; D001794:Blood Pressure; D017024:Chemotherapy, Adjuvant; D002648:Child; D002675:Child, Preschool; D003404:Creatinine / Q000097:blood; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007223:Infant; D007677:Kidney Function Tests; D007680:Kidney Neoplasms / Q000188:drug therapy / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D009392:Nephrectomy / Q000379:methods*; D009399:Nephrons; D011184:Postoperative Period; D012189:Retrospective Studies; D009396:Wilms Tumor / Q000188:drug therapy / Q000503:physiopathology / Q000601:surgery*
chemical_list: D003404:Creatinine