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T-cell non-Hodgkin lymphoma arising in patients with immunodeficiencies
about 11.9 % of all T-NHL, particularly in AITL and PTCL, in NOS, and in about 2% of B-NHL. The same TET2 mutations, for example, have been found in patients with AML/MDS secondary to a previous lymphoma, suggest- ing a shared genetic origin.46,47 Moreover, it has been observed that TET2 loss in mice leads to hypermutagenic- ity in hematopoietic stem cells and progenitor cells, result- ing in an increased risk of various hematologic malignan- cies.48
Considering that most patients had been treated with immunosuppressive drugs or chemotherapy for intervals of longer than two years, it seems that prolonged treat- ment with these types of drugs increases the risk of malig- nant lymphoma development. An association between the use of thiopurines alone or combined with TNF-α inhibitors and the development of HSTCL in IBD patients has been reported previously.15 The majority of patients with IBD in our series and in the reported cases had been using azathioprine. It is possible, therefore, that the use of thiopurines also contributes to the development of other T-NHL.
Obviously, inherent to its retrospective design, our study has some limitations. The clinical data were not complete for all patients, thus making it difficult to assess the temporal relationship between the underlying disor- ders or drug use and the development of T-NHL for some. In addition, the group was too small to run subgroup analyses. Moreover, since the overall prevalence of immunodeficiencies in the general population is not known, we could only compare the prevalence of specific underlying disorders in our cohort of patients with T-NHL to those in the general population.
Conclusion
The 25 cases presented herein, together with the 596 cases found in the literature of T-NHL in patients with varying causes of immunodeficiencies suggest that patients with a secondary immunodeficiency are at increased risk for the development of T-NHL. Prolonged treatment with immunosuppressive or chemotherapeutic drugs seems to contribute to the risk. T-NHL in immunod- eficient patients are histologically very heterogeneous. The distribution of subtypes resembles that present in the general population, with the exception of primary cuta- neous T-NHL and HSTCL, both of which have been reported more often in patients with an immunodeficien- cy, and AITL, which has been reported less frequently in this group. Overall, the prognosis seems worse compared to T-NHL of similar subtypes in the general population. T- NHL occur predominantly in men, and in immunodefi- cient patients they tend to be more often located extran- odally, which is in line with B-cell lymphomas in this group of patients. In our series of immunodeficient patients, the lymphomas occurred on average nine to ten years earlier than T-NHL in the general population.
The observations in the study herein should raise awareness of the possible development of T-NHL in immunodeficient patients and challenge the prolonged use of immunosuppressive drugs in patients who are in clinical remission of their autoimmune disease.
Funding
The study was supported by Lymph&Co and by a grant from the Egbers Foundation.
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