In this study, alveolar macrophage–cathelicidin mRNA expression, VDR, and the VDR coactivator steroid receptor coactivator-3 (SRC3) were measured by quantitative PCR in alveolar macrophages from bronchoalveolar lavage in patients with biopsy-proven sarcoidosis and healthy controls. Here, NCOA3 is linked to sarcoidosis.