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Remission of psoriasis after allogeneic, but not autologous, hematopoietic stem-cell transplantation

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Hematopoietic stem-cell transplantation (HSCT) has emerged as an effective immunotherapy for several severe autoimmune diseases. A comprehensive search of the existing literature was performed for patients with psoriasis and HSCT. Nineteen patients have been reported to have psoriasis resolution after allogeneic or autologous HSCT. In the allogeneic setting, 10 of 13 were noted to have durable remission of their psoriasis with a mean follow-up of 49 months. Two cases that did reoccur were only transient. Six patients underwent autologous transplantation. Of these, 5 of 6 developed a recurrence of their psoriasis within 2 years. Based on a limited number of patients, psoriasis is likely to remit after allogeneic HSCT, but it is likely to recur after autologous HSCT.

Section snippets

Cases of psoriasis resolution

A comprehensive search using the PubMed search engine was conducted in the English language to identify all previously reported cases of psoriasis that resolved after HSCT. The terms “psoriasis,” “hematopoietic stem cell transplantation,” and “bone marrow transplant,” or different combinations of these words, were used. Seventeen cases were initially found. The bibliographies of previously reported cases were cross-checked, allowing for the addition of 1 case report published in the Japanese

Discussion

Allogeneic HSCT is potentially curative for autoimmune diseases, but is associated with higher rates of transplantation-related mortality than autologous HSCT. Consequently, autologous HSCT is the investigational treatment for refractory autoimmune diseases. In large studies of autologous HSCT for autoimmune disease, the transplantation-related mortality rate ranged from 5% to 12%.17, 18, 19 In these cases, the genetic background was unchanged and the same potential T-cell receptor diversity

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      Persistence of autoreactive T cells despite high-dose chemotherapy, reinfusion of autoreactive cells among hematopoietic stem cells, preservation of the genetic background, and re-exposure to an environmental or endogenous trigger are accused for the recurrence of psoriasis after autologous transplant [19]. In addition, it is recommended to favor allogeneic transplantation along with low-intensity or myeloablative preparative regimen to prevent recurrence of autoimmune diseases such as psoriasis, because immunological rearrangement by autologous transplantation may remain inadequate, in comparison to allogeneic transplantation [20]. Kaffenberger et al. examined 13 cases in their review evaluating psoriasis cases in the literature that were followed up after allogeneic transplantation.

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      Indolent disease (treated with a maximum of 1 line of systemic therapy before HCT), myeloablative conditioning, GVHD, and complete chimerism were not prerequisites for remission. Among 16 psoriasis patients with conclusive remission status posttransplant (UPN 338, 442, and 1600, and ref [23,28–39]), psoriasis relapsed in 3 patients at a median of one year posttransplant and did not relapse in 13 patients. Among 9 patients without relapse in whom the duration of remission since IST discontinuation was known, the median duration was 2 years (Table 1 and Supplementary Table S6).

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    Funding sources: None.

    Conflicts of interest: None declared.

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