CRP and neoplasm: Various novel prognostic markers for patients with ENKTL were investigated including pre-treatment serum C-reactive protein [20], controlling nutritional status (CONUT) score [21], 25-hydroxy vitamin D [22], the maximum standardized uptake value (SUVmax) from 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) [23], and circulating tumor DNA [24]; these, as well as novel prognostic models [22,23,24,25] should be validated further.