Palchevskiy et al. found elevated BAL levels of CCL2 and CCL5 throughout all stages of sarcoidosis [27], but while Christophi et al. found increased mRNA levels of CCL2 in tissue samples from sarcoid granulomas, the CCL2 levels could not differentiate sarcoid granulomas from other granulomatous inflammation [30]. This evidence concerns the gene CCL2 and sarcoidosis.