title: The effects of lanthanum carbonate and calcium carbonate on bone abnormalities in patients with end-stage renal disease.
abstract: BACKGROUND
  Renal osteodystrophy is a common complication of end-stage renal disease (ESRD) and is a major cause of morbidity in patients with ESRD. High serum levels of phosphorus, calcium and parathyroid hormone are associated with the development of this disease. The effects on bone of treatment with lanthanum carbonate, a new phosphate binder, and calcium carbonate were assessed in patients with ESRD.
  
  
  METHODS
  This was an open-label, multicenter, parallel-group study. Patients were recruited within 12 weeks of commencing dialysis. Following screening, phosphate binder administration was stopped, tetracycline labeling administered and a transiliac bone biopsy taken. After randomization to lanthanum carbonate or calcium carbonate, patients were titrated to an optimum dose for 8 weeks and maintained at this dose for 44 weeks. The bone was then labeled and a second biopsy taken. Biopsy samples were analyzed histomorphometrically.
  
  
  RESULTS
  Paired bone biopsies from 33 lanthanum carbonate- and 30 calcium carbonate-treated patients were suitable for analysis. None of the patients on either treatment developed osteomalacia. Assessment of activation frequency changes showed that 41% of biopsies from lanthanum carbonate-treated patients moved towards normal (observed values at the follow-up biopsy were closer to expected values than were the baseline values, so patients were considered to be improved) compared with 23% of calcium carbonate-treated patients (p = 0.15).
  
  
  CONCLUSIONS
  This study indicates that there was no evidence of aluminum-like toxicity with lanthanum carbonate after 1 year of treatment in ESRD patients commencing dialysis, and there appeared to be a beneficial effect on bone-cell function and activity compared with calcium carbonate.
authors.affiliation: Osteoarticular Pathology, The Medical School, University of Manchester, UK. tony.freemont@man.ac.uk
authors.forename: A J
authors.initials: AJ
authors.lastname: Freemont
authors.forename: J A
authors.initials: JA
authors.lastname: Hoyland
authors.forename: J
authors.initials: J
authors.lastname: Denton
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D002117:Calcitriol / Q000097:blood; D002118:Calcium / Q000097:blood; D002119:Calcium Carbonate / Q000627:therapeutic use*; D012080:Chronic Kidney Disease-Mineral and Bone Disorder / Q000188:drug therapy* / Q000209:etiology; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000150:complications*; D007811:Lanthanum / Q000627:therapeutic use*; D008297:Male; D010758:Phosphorus / Q000097:blood; D006435:Renal Dialysis; D016896:Treatment Outcome
chemical_list: D010758:Phosphorus; C119467:lanthanum carbonate; D007811:Lanthanum; D002117:Calcitriol; D002119:Calcium Carbonate; D002118:Calcium