title: Reactions to other corticosteroids in patients with positive patch test reactions to budesonide.
abstract: BACKGROUND
  Corticosteroid cross-reactions have been classified into four well-defined groups. A previous study of patch test reactions to other corticosteroids in patients allergic to hydrocortisone failed to conform to these groups. It was suggested that substitution at the C6 and C9 positions of the corticosteroid was the most important determinant of a further reaction.
  
  
  OBJECTIVE
  Our aim was to analyze multiple positive patch tests to corticosteroids in patients sensitized to budesonide to confirm our earlier findings.
  
  
  METHODS
  Forty-six patients with positive patch tests to budesonide were patch-tested to 17 other topical corticosteroids. The results were examined by a generalized linear model and a chi-square test.
  
  
  RESULTS
  Substitution of the corticosteroid at the C6 and C9 positions significantly reduced the number of reactions. A different substitution at the C16 and C17 positions was less important, and that at the C21 position was of no significance.
  
  
  CONCLUSIONS
  Patients sensitized to budesonide are most likely to react to other non-C6 and non-C9 substituted corticosteroids.
mesh_terms: D000305:Adrenal Cortex Hormones / Q000009:adverse effects* / Q000145:classification; D000704:Analysis of Variance; D001415:Back; D016010:Binomial Distribution; D019819:Budesonide; D016009:Chi-Square Distribution; D016001:Confidence Intervals; D004342:Drug Hypersensitivity / Q000175:diagnosis*; D005938:Glucocorticoids / Q000009:adverse effects*; D006801:Humans; D010328:Patch Tests / Q000706:statistics & numerical data; D011282:Pregnenediones / Q000009:adverse effects*; D013329:Structure-Activity Relationship; D013997:Time Factors
chemical_list: D000305:Adrenal Cortex Hormones; D005938:Glucocorticoids; D011282:Pregnenediones; D019819:Budesonide