ALK and anaplastic large cell lymphoma: Indeed, this was also the case for ALK- ALCL (8/9 cases positive: 3 cases +, 5 cases ++), PTCL-NOS (8/8 cases positive, all ++) and AITL (6/6 cases positive: 2 cases +, 4 cases ++), with only one ALK- ALCL patient showing negative staining for BRG1.