According to the presence or the absence of the cytogenetic abnormalities mentioned above, three different subgroups of ALK− ALCL have been characterized: DUSP22-rearranged ALCLs, TP63-rearranged ALCLs, and triple-negative ALCLs lacking DUSP22, TP63, and ALK [122]. Here, ALK is linked to anaplastic large cell lymphoma.