Systemic ALCL (sALCL) is currently subdivided into anaplastic lymphoma kinase positive (ALK +) ALCL and ALK negative (ALK-) ALCL; in addition, primary cutaneous ALCL (pcALCL) and breast-implant associated ALCL are also recognized as separate subtypes of ALCL [1–3]. Here, ALK is linked to anaplastic large cell lymphoma.