Other common subtypes of PTCL include PTCL, non-specific (PTCL-NOS), angioimmunoblastic T-cell lymphoma (AITL), and anaplastic lymphoma kinase (ALK)+/− anaplastic large cell lymphoma (ALCL) (Swerdlow et al., 2016; Liu et al., 2020). This evidence concerns the gene ALK and anaplastic large cell lymphoma.