PTPRC and idiopathic pulmonary fibrosis: At the myeloid level, CD45 on monocytic myeloid-derived suppressor cells (MDSCs) (OR=1.12, 95% CI [1.01-1.25], P=0.032) and CD45 on immature MDSCs (OR=1.08, 95% CI [1.01-1.17], P=0.030) were associated with an increased risk of IPF.