title: Delayed cutaneous hypersensitivity tests and lymphopenia as activity markers in sarcoidosis.
abstract: OBJECTIVE
  To evaluate new and already known biological markers of activity in patients with sarcoidosis.
  
  
  METHODS
  A 10-year prospective clinical evaluation, including a battery of delayed cutaneous hypersensitivity tests (DCHTs) and other markers of activity.
  
  
  METHODS
  Outpatient department of a university teaching hospital.
  
  
  METHODS
  Forty patients with biopsy-proven sarcoidosis were prospectively evaluated every 6 months. In this study, only the visits that fulfilled the situation of active period (AcP) or of asymptomatic period (AsP) were taken into account. Twenty-one visits were considered to be in the AcP, and 26 were considered to be in the AsP. Seven patients were studied both in the AcP and the AsP.
  
  
  METHODS
  DCHTs and blood sample extraction every 6 months.
  
  
  RESULTS
  The mean diameter of the cutaneous wheal for each antigen (AG) was lower in the AcP group than in the AsP group (candidine, p < 0.0001; tuberculin, p < 0.0009; trichophytin, p < 0.02; streptokinase-streptodornase, p < 0.001). Also, the mean (+/- SD) diameter for the four AGs taken together was lower in the AcP group (2.3 +/- 4.2 mm) than in the AsP group (16.8 +/- 9.3 mm; p < 0.0001). The mean serum angiotensin-converting enzyme (S-ACE) value was higher in the AcP group than in the AsP group (p < 0.02). A low lymphocyte count and a percentage of the lymphocyte count (< 20%) also were detected more frequently in the AcP group than in the AsP group (p < 0.02 and p < 0.0001, respectively).
  
  
  CONCLUSIONS
  DCHTs appear to be a simple, reliable, and easily performed marker of inflammatory activity in sarcoidosis patients. Furthermore, serum total and differential lymphocyte count and the S-ACE level proved to be useful inflammatory markers in this study.
authors.affiliation: Servei de Pneumologia, Hospital General Vall d'Hebron, Barcelona, Spain. fmorell@hg.vhebron.es
authors.forename: Ferran
authors.initials: F
authors.lastname: Morell
authors.forename: Gur
authors.initials: G
authors.lastname: Levy
authors.forename: Ramon
authors.initials: R
authors.lastname: Orriols
authors.forename: Jaume
authors.initials: J
authors.lastname: Ferrer
authors.forename: Javier
authors.initials: J
authors.lastname: De Gracia
authors.forename: Gabriel
authors.initials: G
authors.lastname: Sampol
mesh_terms: D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000175:diagnosis* / Q000276:immunology; D007428:Intradermal Tests; D008231:Lymphopenia / Q000175:diagnosis* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D017565:Sarcoidosis, Pulmonary / Q000175:diagnosis* / Q000276:immunology; D012867:Skin / Q000276:immunology; D014797:Vital Capacity / Q000502:physiology