Figure 8 Representative immunohistochemical analysis of CD34 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. CD34 immunoreactivity (red staining) was seen in interstitial areas in all patient SLBs. (D) The highest expression of CD34 was seen in SLBs from the NSIP patient group. Original magnification, ×200. NSIP, non‐specific interstitial pneumonia; RBILD, respiratory bronchiolitis/interstitial lung disease; SLB, surgical lung biopsy; UIP, usual interstitial pneumonia.