“…2 Prior papers have described selected trace elements in specific pleural conditions. [3][4][5][6] In this study, we profiled a large unbiased cohort of well characterized pleural effusions to (a) confirm the presence of six common trace elements (zinc, copper, cobalt, manganese, iron, and molybdenum); and (b) evaluate their relationship with effusion etiology and biochemical characteristics in commonly encountered pleural effusions.…”