... elevated erythrocyte sedimentation rate to beassociated with poor outcome [8]. In addition, classificationcriteria in established PsA appear to be confounded by the effects of therapy, with 49% of ... and the focus should be on trying to identify features, perhaps common to the targettissues (skin, synovium and enthesis), which are specific for the disease. To date, efforts have focused on ... tissueanalysis and on studies of T-cell specificity but have largelyfailed to identify either disease-specific immunohistologicfeatures (cell markers/cytokine expression) [1,3,10] orevidence of T-cell...