IL-9 has been shown to promote the development of multiple human liquid tumors, including nasal natural killer (NK)/T-cell lymphoma [27], anaplastic large-cell lymphoma [28], and B-cell non-Hodgkin’s lymphoma [29], and the IL-9 antibody can inhibit the proliferation of these cells. Here, IL9 is linked to T-cell non-Hodgkin lymphoma.