title: Genetic polymorphisms of CYP3A4 among Chinese patients with steroid-induced osteonecrosis of the femoral head.
abstract: BACKGROUND
  Steroid therapy has been an important reason of nontraumatic osteonecrosis of the femoral head (ONFH). Steroids are metabolized by hepatic cytochrome P4503A, a low endogenous activity of this enzyme can contribute to the pathogenesis of ONFH. The aim of this study was to investigate the associations of polymorphisms of cytochrome P4503A4 (CYP3A4) gene with steroid-induced ONFH in Chinese patients.
  
  
  METHODS
  A total of 150 steroid-induced ONFH patients and 250 healthy controls were enrolled. We evaluated 5 single-nucleotide polymorphisms of the CYP3A4 gene in this case-control study.
  
  
  RESULTS
  We identified rs2242480 in the CYP3A4 gene that was potentially associated with an increased risk of steroid-induced ONFH in the allele model (P = 0.023; odds ratio [OR]: 1.47; 95% confidence intervals [CI]: 1.05-2.04) and in the additive model (P = 0.028; OR: 1.44; 95% CI: 1.04-1.99) adjusted age + gender. Furthermore, we also observed a protective effect of haplotype "TG" (P = 0.025; OR: 0.69; 95% CI: 0.49-0.96) and a risk effect of haplotype "CG" (P = 0.006; OR: 1.81; 95% CI: 1.19-2.77) of the CYP3A4 gene adjusted age + gender.
  
  
  CONCLUSIONS
  These findings suggested that polymorphisms of CYP3A4 gene may be associated with susceptibility to steroid-induced ONFH.
authors.affiliation: The People's Hospital of Manzhouli City, Manzhouli The Second Affiliated Hospital, Inner Mongolia Medical University Inner Mongolia Medical University, Hohhot, Inner Mongolia, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiuling
authors.initials: X
authors.lastname: Li
authors.forename: Yaoyu
authors.initials: Y
authors.lastname: Gao
authors.forename: Zhi
authors.initials: Z
authors.lastname: Li
authors.forename: Lidong
authors.initials: L
authors.lastname: Yu
authors.forename: Qingbo
authors.initials: Q
authors.lastname: Meng
authors.forename: Li
authors.initials: L
authors.lastname: Sun
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Wang
mesh_terms: D000328:Adult; D044466:Asian People; D016022:Case-Control Studies; D051544:Cytochrome P-450 CYP3A / Q000235:genetics*; D005260:Female; D005271:Femur Head Necrosis / Q000139:chemically induced* / Q000235:genetics*; D005938:Glucocorticoids / Q000009:adverse effects*; D006801:Humans; D008297:Male; D020641:Polymorphism, Single Nucleotide; D011241:Prednisone / Q000009:adverse effects*
chemical_list: D005938:Glucocorticoids; D051544:Cytochrome P-450 CYP3A; D011241:Prednisone