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Initial prognostic factors and lymphoblast-erythrocyte rosette formation in 109 children with acute lymphoblastic
Insights
Children with acute lymphoblastic leukemia (ALL) and E+ lymphoblasts exhibit distinct clinical features, suggesting a biologically different subtype. This finding may indicate a link between E+ ALL and non-Hodgkin lymphoma.
Area of Science:
- Pediatric Oncology
- Hematology
- Immunology
Background:
- Acute lymphoblastic leukemia (ALL) is a heterogeneous disease.
- Understanding subtypes of ALL is crucial for targeted treatment.
- Erythrocyte rosetting (E+) in lymphoblasts may indicate distinct ALL subtypes.
Purpose of the Study:
- To investigate the clinical characteristics of children with untreated acute lymphoblastic leukemia (ALL) and E+ lymphoblasts.
- To determine if E+ lymphoblasts are associated with specific clinical features.
- To explore the potential biological and clinical distinctiveness of E+ ALL.
Main Methods:
- Analysis of bone marrow lymphoblasts from 109 children with untreated ALL.
- Testing for spontaneous rosette formation with sheep erythrocytes (E+).
- Correlation of E+ lymphoblasts with 13 initial clinical characteristics using hierarchical classification and logistic regression.
Main Results:
- Twenty-six percent (26%) of children had E+ lymphoblasts.
- Significant associations found between E+ lymphoblasts and mediastinal enlargement, high leukocyte counts, enlarged lymph nodes, older age, higher hemoglobin, hepatomegaly, male gender, and non-cervical lymphadenopathy.
- E+ ALL patients demonstrated a poorer clinical course compared to E- ALL patients.
Conclusions:
- The distinct clinical profile of E+ ALL suggests it represents a biologically and clinically separate subtype of acute lymphoblastic leukemia.
- The findings support the hypothesis that E+ ALL may arise from a leukemic transformation of non-Hodgkin lymphoma.
- Further research is warranted to elucidate the specific mechanisms and therapeutic implications of E+ ALL.
Abstract:
Bone marrow lymphoblasts from 109 children admitted with untreated acute lymphoblastic leukemia (ALL) were tested for spontaneous rosette formation with sheep erythrocytes. Twenty-six children (24%) had lymphoblasts that formed rosettes (E+). Of 13 initial clinical characteristics, 8 were significantly associated with E+ lymphoblasts: mediastinal enlargement (86% of patients E+), leukocyte counts over 100 X 10(9)/liter (65% E+), nodes greater than 2 cm in any diameter (65% E+), age over 5 yr (46% E+), hemoglobin over 8 g/dl (44% E+), hepatomegaly greater than 5 cm (38% E+), boys (35% E+), and lymph node enlargement outside of the cervical area (28% E+). Spleen size, initial platelet counts, and periodic acid-Schiff scores did not distinguish E+ from E- patients. Since few patients were black and few presented with central nervous system leukemia, the association of these two characteristics with E+ blasts could not be determined. A hierarchical classification scheme and a linear logistic regression model were used to define the patterns of characteristics associated with E+ lymphoblasts. The initial clinical characteristics and the poorer course of E+ patients suggest that ALL comprises at least two biologically and clinically distinct types. The E+ ALL may result from a leukemic transformation of a non-Hodgkin lymphoma.