title: A meta-analysis comparing the biochemistry of primary hyperparathyroidism in youths to the biochemistry of primary hyperparathyroidism in adults.
abstract: BACKGROUND
  The distinctive presentation of primary hyperparathyroidism (PHPT) in adults and youths suggest that PHPT is a fundamentally different disease in these two groups.
  
  
  OBJECTIVE
  To understand the difference in PHPT between adults and youths we compared the biochemistry of PHPT in these two groups.
  
  
  METHODS
  This study is a systematic review and meta-analysis of retrospective studies published 1966-2014 on PHPT.
  
  
  METHODS
  All studies were obtained through Medline (1966-2014).
  
  
  METHODS
  Only studies that included post-surgical subjects and that explicitly described biochemical results from more than one decade were included. Data were extracted from each article to generate the mean and SE for multiple biochemical parameters.
  
  
  RESULTS
  We analyzed 16 studies describing 268 unique youths and 2405 adults with PHPT. Youths with PHPT had significantly (P < .05) greater serum and urinary calcium than adults with PHPT (3.2 ± 0.1 mmol/L vs 2.8 ± 0.0 mmol/L for serum calcium, and 9.95 ± 1.26 mmol/d vs 7.15 ± 0.56 mmol/d for urine calcium, [mean ± SEM]). There were no significant differences in serum intact PTH, phosphorus, or alkaline phosphatase.
  
  
  CONCLUSIONS
  Juvenile PHPT has greater hypercalcemia and hypercalciuria than adult PHPT at similar concentrations of serum intact PTH. These observations suggest that there are differences in the pathophysiology of PHPT between juvenile and adult patients who reflect an apparent decrease in the sensitivity of the parathyroid adenoma to negative feedback by calcium and increased sensitivity of target tissues to the effects of PTH.
authors.affiliation: Division of Endocrinology and Diabetes, The Children's Hospital of Philadelphia and the Department of Pediatrics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, 19104.
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Roizen
authors.forename: Michael A
authors.initials: MA
authors.lastname: Levine
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000378:metabolism; D002648:Child; D006801:Humans; D049950:Hyperparathyroidism, Primary / Q000378:metabolism*; D008875:Middle Aged