17th International Conference on Malignant Lymphoma, Palazzo dei Congressi, Lugano, Switzerland, 13 - 17 June, 2023.

Abstract

Introduction: Adult T-cell leukemia/lymphoma (ATL) is a peripheral T-cell malignancy caused by human T-cell leukemia virus type I (HTLV-1), endemic in some areas of the world, such as Brazil. Between 3% and 5% of HTLV-1-infected individuals develop ATL after a long latency. The clinical features are heterogeneous and classified into acute, lymphoma, chronic and smoldering types. Acute and lymphoma types are defined as aggressive whereas the others as indolent ATL. On April 2017, the T-cell Brazil project was launched. Methods: Ambispective observational study design collected 90 ATL patients from 606 registered cases in the T-Cell Brazil Project. Its main goal is to describe demographic and clinical features, analyze the overall and progression-free survival (OS and PFS), and try to identify factors that could influence them. REDcap Platform has been used to collect and store data, and the IBM-SPSS version 24 for statistical analysis. Results: The median age was 50 years (23–88), 59% female; 50% was lymphoma subtype, followed by 33% acute (both aggressive), 12% chronic and 5% smoldering (indolent); 87% had advanced stage disease (III-IV, Ann Arbor), 57% had B symptoms and 11% had Central Nervous System involved. Both indolent and aggressive had elevated serum LDH levels. 25% received chemotherapy plus immunotherapy, whilst 46% took chemotherapy alone with anthracycline-based regimens (46% CHOEP; 33% CHOP; 21% others). The best response (complete plus partial) after 1st line of treatment reached 50%; 31% had no response or progression; 13% was undetermined due early death; 5% were on treatment, and 1% had stable disease (without treatment). Median follow-up was ten months (0–78) and 18 months for 35% of alive cases. OS for 24 months was 34% (95% CI: 24%–44%), whereas 24-month PFS was 20% (95% CI: 12%–28%). Indolent presented better OS and PFS when compared with Aggressive; 86% versus 33%, P = 0.001 for OS and 45% versus 12%, P = 0.002 for PFS. Public medical care had worst OS and PFS than private (P = 0.14 and P = 0.05). The multivariate Cox Regression for OS resulted hypoalbuminemia - albumin <3.5 g/dL (HR 2.13 CI95% 1.10–4.12, P = 0.024) plus LDH twice the normal value (HR 2.49 CI95% 1.17–5.32, P = 0.018) as predictors. And for PFS were male (HR 1.83 CI95% 1.03–3.24, P = 0.037), ECOG > 1 (HR 2.01 CI95% 1.10–3.70, P = 0.023) and hypoalbuminemia (HR 3.35 CI95% 1.82–6.17, P < 0.0001). The research was funded by: Educational Support by Takeda Keyword: aggressive T-cell non-Hodgkin lymphoma No conflicts of interests pertinent to the abstract.