Light microscopy 1 or 2 RS >3 RS P Moderate inflammatory infiltrate 4(36%) 3(38%) 0.343 Intraepithelial Lymphocytes (hpf) 6 12 0.62 Apoptotic body (hpf) 5.3 6.6 0.301 Eosinophils (hpf) 14.4 3.6 0.219 Glandular density (hpf) 6.8 11 0.62 Moderate/severe edema 4(36%) 3(38%) 0.567 Moderate/severe fibrosis 4(36%) 5(63%) 0.74 Basal Membrane (mm) 0.048 0.032 0.593

Table 4: Rhinosinusitis recurrence and the nasal epithelium aspects under optical microscopy in patients with and without chronic graft-versus-host disease (GVHD). (1 or 2 RS=1-2 episodes of rhinosinusitis>3 RS=more than 3 episodes of rhinosinusitis; P=P value; No./hpf: number per 40x high-power field, RS: rhinosinusitis).