IL4 and sarcoidosis: The aim of this study was to determine if IL-4 and IL-4R play any role in chronic EAA pathogenesis by: (i) comparing bronchoalveolar lavage fluid (BALF) concentrations in chronic EAA and sarcoidosis patients (sarcoidosis being considered a typical Th1 mediated disease) and (ii) looking for correlations among IL-4 and IL-4R BALF concentrations and clinical parameters of patients with chronic EAA (gender, smoking status, pulmonary function tests, BALF differential cell counts, high resolution computed tomography pattern of the disease).