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Background Pulmonary sarcoidosis has a variable course ranging from self-limiting disease to progressive fibrosis. Activation of fibroblasts, myofibroblast transformation, and matrix production may contribute to pulmonary damage in sarcoidosis. These processes are influenced by pulmonary cytokines which can be measured in bronchoalveolar lavage fluid (BALF). In order to clarify the incompletely understood...