CD274 and B-cell chronic lymphocytic leukemia: In contrast, overexpression of oncogenic and immunosuppressive miRNAs—miR-155-5p, miR-221-5p, and miR-144-5p—was observed exclusively in CLL patients with SID [15,48,49,50,51], suggesting their contribution to immune evasion via PD-L1 upregulation and T-cell dysfunction.