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Yet, the description of a polymorphic cell infiltration in LN biopsy, the absence of clinical lymphadenopathy at presentation, the history of psoriatic arthritis as well as the preceded treatment with anti-tumor necrosis factor (TNF)- and cyclosporine raised diagnostic concerns. Although the patient could not finally avoid R-CHOP immunochemotherapy, this case highlights that a trial of NBA withdrawal under very close monitoring could be a rational therapeutic choice even in patients with aggressive ID-LPDs. Keywords: diffuse large B-cell lymphoma; psoriasis; infliximab; apremilast; novel biologic agent; anti-TNF EN diffuse large B-cell lymphoma psoriasis infliximab apremilast novel biologic agent anti-TNF 1695 1700 6 10/12/23 20231001 NES 231001 The association of psoriasis with cancer has been a matter of debate, especially in the era of the novel biologic agents (NBA). Lastly, taking into consideration our case with the re-appearance of the lymphoma despite the change of NBA as well as all the other cases described in Table 1, the appearance of LPDs in psoriatic patients is a more complex process influenced by clinical disease duration and extension, the time length of immunosuppression and the nature of the various treatments administered. [Extracted from the article]

• PMLBCL rarely extends to extranodal subdiaphragmatic (ES) sites at diagnosis. • Among 455 patients, 32 (7%) had such localization at baseline. • Kidney, liver, and adrenals were most frequently involved. • ES site involvement had not independent prognostic impact beyond that of stage IV. [ABSTRACT FROM AUTHOR]