[Acute T-cell lymphoproliferative syndromes. A study of 29 cases].

The clinical and hematological profile, the response to therapy and the clinical evolution of 29 patients with acute T lymphoproliferative syndromes (ATLS) diagnosed during the last 5 years were evaluated. Mean age was 22.6 (SD 9.5) years. 24 patients were males and 5 females. Lymphadenopathy was present in 25 patients, hepatomegaly in 16 and splenomegaly in 14. Seventeen patients had a mediastinal mass. Anemia was present in 41% of patients and thrombocytopenia in 50%. The mean leukocyte count was 71 x 10(9)/l (SD 93). Bone marrow infiltration was found in 25 patients. The acid phosphatase reaction was positive, centrosomal type, in all cases except two. The immunophenotypic study classified the ATLS patients in the subtypes pre-T (10 cases), cortical thymic (15 cases), and mature thymic (4 patients). The cases with pre-T phenotype had a greater degree of bone marrow infiltration and lower frequency of mediastinal mass than the rest of patients. The rate of complete remissions (CR) was 83%. At the time of closing the study 12 patients had relapsed, with a median time of CR of 9.4 months. In addition, 11 patients had died, with a median survival of the series of 19 months. The results of the present study indicate that, despite some heterogeneity, those cases of ATLS with a more immature immunological phenotype (pre-T) have clinical and biological features more akin to acute leukemia, unlike those with a thymic phenotype (cortical or mature), which would be closer to lymphoblastic lymphoma.(ABSTRACT TRUNCATED AT 250 WORDS)