First-Line Treatment and Survival of Stage I(E) Peripheral T-Cell Lymphoma in the Netherlands; A Nationwide Population-Based Cohort Study

• Published in: Blood 2021-11, Vol.138 (Supplement 1), p.1381-1381
• Main Authors: Meeuwes, Frederik O., Brink, Mirian, Van Der Poel, Marjolein W.M., Kersten, Marie José, Wondergem, Mariëlle, Mutsaers, Pim G.N.J., Böhmer, Lara H., Woei-a-Jin, F.J. Sherida H., Visser, Otto J., Oostvogels, Rimke, Jansen, Patty M., Neelis, Karen J., Crijns, Anne P.G., Daniëls, Laurien A., Vermaat, Joost S.P., Huls, Gerwin A., Nijland, Marcel
• Format: Article
• Language: English
• ISSN: 0006-4971; 1528-0020
• DOI: 10.1182/blood-2021-148038

Introduction: Peripheral T-cell lymphomas (PTCL) comprise a heterogenous group of mature T-cell neoplasms with generally an unfavorable prognosis. Presentation of PTCL with stage I(E) disease, according to the Ann Arbor classification, is uncommon. Clinical trials in diffuse large B-cell lymphoma (DLBCL) support the use of an abbreviated treatment with rituximab, cyclophosphamide, doxorubicin, vincristine and prednisone combined with radiotherapy (combined modality therapy (CMT)) in case of stage I(E) disease. CMT in stage I(E) PTCL has been adapted in daily practice, but clinical trials are lacking. A recent population-based study conducted in Scandinavia indicated that the outcome in patients with limited stage PTCL is as poor as in patients with extensive disease. However, the outcomes of different treatment modalities were not analyzed. Aim: The aim of this nationwide population-based cohort study is to describe first-line treatment and outcome of patients with stage I(E) PTCL in comparison to advanced stage PTCL. Methods: All newly diagnosed patients ≥ 18 years with stage I(E) PTCL who were diagnosed in 1989-2018 were identified in the Netherlands Cancer Registry (NCR). Survival follow-up was available through February 1, 2021. The PTCL subgroups analyzed included anaplastic large cell lymphoma (ALCL), angioimmunoblastic T-cell lymphoma (AITL), enteropathy associated T-cell lymphoma (EATL) and peripheral T-cell lymphoma NOS (PTCL NOS). Patients were categorized according to treatment regimen, i.e. chemotherapy, chemotherapy followed by autologous stem cell transplantation (ASCT), radiotherapy, CMT, and no/other therapy. Calendar period analyses (1989-1999 and 2000-2018) were conducted to assess trends in primary therapy and overall survival (OS) over time. The calendar periods were defined according to the implementation of CMT in patients with limited stage DLBCL from approximately 2000 onward in the Netherlands. The primary endpoint was OS, defined as all-cause-death post-diagnosis. Results: From 1989 to 2018, 854 patients with a median age of 62 years were diagnosed with stage I(E) PTCL, accounting for 19% of all PTCL diagnoses. In stage I(E), the predominant PTCL subtype was PTCL NOS (40%, n=343). Furthermore, 26% (n=222) of patients were diagnosed with ALCL, 3% (n=28) with AITL, 11% (n=93) with EATL and 20% (n=168) with other histological subtypes. In contrast, for patients with advanced stage disease, 42% was diagnosed with PTCL NOS, 23% with AL