Significant increase in BAL fluid levels of MCP-1 in patients with IPS after allogeneic BMT. BAL fluid was obtained from healthy volunteers (n = 5) and from allogeneic BM transplant recipients with IPS (n = 11) or chronic noninfectious lung injury (n = 14) after allogeneic BMT as described in “Patients, materials, and methods.” Individual data points are expressed. Horizontal bars indicate the average value in each group. ^*P < .05, IPS and chronic versus healthy controls; ⁺P < .05, IPS versus chronic.