title: An exploratory factor analysis of the spontaneous reporting of severe cutaneous adverse reactions.
abstract: BACKGROUND
  Severe cutaneous adverse reactions (SCARs) are prominent in pharmacovigilance (PhV). They have some commonalities such as nonimmediate nature and T-cell mediation and rare overlap syndromes have been documented, most commonly involving acute generalized exanthematous pustulosis (AGEP) and drug rash with eosinophilia and systemic symptoms (DRESS), and DRESS and toxic epidermal necrolysis (TEN). However, they display diverse clinical phenotypes and variations in specific T-cell immune response profiles, plus some specific genotype-phenotype associations. A question is whether causation of a given SCAR by a given drug supports causality of the same drug for other SCARs. If so, we might expect significant intercorrelations between SCARs with respect to overall drug-reporting patterns. SCARs with significant intercorrelations may reflect a unified underlying concept.
  
  
  METHODS
  We used exploratory factor analysis (EFA) on data from the United States Food and Drug Administration Adverse Event Reporting System (FAERS) to assess reporting intercorrelations between six SCARs [AGEP, DRESS, erythema multiforme (EM), Stevens-Johnson syndrome (SJS), TEN, exfoliative dermatitis (ExfolDerm)]. We screened the data using visual inspection of scatterplot matrices for problematic data patterns. We assessed factorabilityviaBartlett's test of sphericity, Kaiser-Myer-Olkin (KMO) statistic, initial estimates of communality and the anti-image correlation matrix. We extracted factorsviaprinciple axis factoring (PAF). The number of factors was determined by scree plot/Kaiser's rule. We also examined solutions with an additional factor. We applied various oblique rotations. We assessed the strength of the solution by percentage of variance explained, minimum number of factors loading per major factor, the magnitude of the communalities, loadings and crossloadings, and reproduced- and residual correlations.
  
  
  RESULTS
  The data were generally adequate for factor analysis but the amount of variance explained, shared variance, and communalities were low, suggesting caution in general against extrapolating causality between SCARs. SJS and TEN displayed most shared variance. AGEP and DRESS, the other SCAR pair most often observed in overlap syndromes, demonstrated modest shared variance, along with maculopapular rash (MPR). DRESS and TEN, another of the more commonly diagnosed pairs in overlap syndromes, did not. EM was uncorrelated with SJS and TEN.
  
  
  CONCLUSIONS
  The notion that causality of a drug for one SCAR bolsters support for causality of the same drug with other SCARs was generally not supported.
authors.affiliation: Pfizer Inc., 235 East 42nd Street, Mail stop 150-3-80W, New York, NY 10017, USA.
authors.forename: Manfred
authors.initials: M
authors.lastname: Hauben
authors.affiliation: Pfizer Inc., New York, NY, USA.
authors.forename: Eric
authors.initials: E
authors.lastname: Hung
authors.affiliation: Pfizer Inc., New York, NY, USA.
authors.forename: Wen-Yaw
authors.initials: WY
authors.lastname: Hsieh
keywords: Cutaneous adverse drug reactions; Factor analysis; Sponanteous reporting