
Higher blood monocyte counts are associated with worse survival in adults with clinically diagnosed pulmonary fibrosis. However, their association with the development and progression of interstitial lung abnormalities (ILA) in humans is unknown. In four independent cohorts, the study evaluated the associations of blood monocyte count and other immune cell types with ILA, high-attenuation areas, and FVC. Compared with participants without ILA, there was a higher percentage of activated monocytes among those with ILA in MESA. Higher monocyte count was associated with more significant high-attenuation areas in MESA and lower FVC in MESA and COPDGene. Associations of other immune cell types were less consistent. Higher blood monocyte counts were associated with the presence and progression of interstitial lung abnormalities and lower FVC.
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