Similarly, the number of PAFR positive alveolar macrophages is significantly higher in IPF (median 157,029 cells per mm2, range 25,707–1,432,457 cells per mm2) compared to NC (median 74,713 cells per mm2, range 22,630–150,741 cells per mm2, p = 0.0005) (Figure 3C). Here, PTAFR is linked to idiopathic pulmonary fibrosis.