ALK and diffuse large B-cell lymphoma: Of all the B-NHL, there were 418 cases of DLBCL, accounting for the highest proportion (18.3%, 418/2291), including diffuse large B-cell lymphoma-not otherwise specified (DLBCL-NOS), primary mediastinal large B-cell lymphoma (PMBL), EBV-positive DLBCL and ALK-positive large B-cell lymphoma (LBCL).