Figure 6 Representative immunohistochemical analysis of CXCR4 in SLBs from (A, B) UIP, (C, D) NSIP, (E, F) RBILD, and (G,H) normal margin tumour patient groups. Panels (A), (C), (E), and (G) show control staining. CXCR4 immunoreactivity (red staining) was seen in mononuclear cells present in IIP and normal margin SLBs. Original magnification, ×200. CXCR4, CX chemokine receptor 4; IIP, idiopathic interstitial pneumonia; NSIP, non‐specific interstitial pneumonia; RBILD, respiratory bronchiolitis/interstitial lung disease; SLB, surgical lung biopsy; UIP, usual interstitial pneumonia.