ALCL displays a specific snoRNA profile. (A) Supervised snoRNA expression analysis demonstrated a set of 30 snoRNAs differentially expressed in ALCL patients compared with other PTCL subtypes. *Filtered genes according to selected criteria (fold change > 1.3 and P < .05). (B) U3 snoRNA expression levels discriminate ALK⁺ from ALK⁻ ALCL patients. *P < .05; **P < .01; ***P < .001.