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Initial blood fetal hemoglobin concentration is elevated and is associated wtih prognosis in children with acute
1Children's Hospital, University of Helsinki, Finland.
Insights
Elevated fetal hemoglobin (HbF) levels in children with leukemia correlate with a higher risk of death or relapse. Increased HbF synthesis appears linked to more aggressive forms of childhood leukemia.
Area of Science:
- Pediatric Hematology Oncology
- Molecular Biology
Background:
- Fetal hemoglobin (HbF) is typically present in fetal blood and decreases after birth.
- Elevated HbF levels can be observed in various hematological conditions, including certain leukemias.
Purpose of the Study:
- To investigate the association between initial fetal hemoglobin (HbF) concentration and prognosis in pediatric leukemia patients.
- To determine if HbF levels can serve as a predictive biomarker for outcomes in childhood leukemia.
Main Methods:
- Retrospective analysis of 100 children diagnosed with leukemia.
- Multivariate analysis to assess the relationship between initial HbF levels and the risk of death or relapse.
- Comparison of mean initial HbF concentrations between acute lymphoblastic leukemia (ALL) and myeloid leukemia subtypes.
Main Results:
- Initial fetal hemoglobin (HbF) concentration was generally elevated in pediatric leukemia patients.
- Each 1 g/l increase in initial HbF was associated with a 1.13-fold increased risk of death/relapse in acute lymphoblastic leukemia (ALL) (P < 0.05).
- Each 1 g/l increase in initial HbF was associated with a 1.20-fold increased risk of death/relapse in myeloid leukemias (P < 0.02).
- Mean initial HbF was higher in myeloid leukemias (3.4 g/l) compared to ALL (1.1 g/l).
Conclusions:
- Increased fetal hemoglobin (HbF) synthesis is associated with the degree of malignancy in pediatric leukemia.
- Elevated HbF levels may indicate a more aggressive disease course in children with leukemia.
- HbF concentration could potentially serve as a prognostic marker in pediatric leukemia management.
Abstract:
We examined the relationship between initial blood fetal hemoglobin (HbF) concentration and prognosis in 100 children with leukemia. HbF concentration was usually elevated and ranged between 0 and 19.5 g/l. Multivariate analysis showed that, in patients with acute lymphoblastic leukemia (ALL), each increment of 1 g/l in initial HbF concentration resulted in a 1.13-fold rise in the risk of death or relapse (95% confidence limits 1.01-1.25, P less than 0.05). In patients with myeloid leukemias, each increment of 1 g/l in HbF was associated with a 1.20-fold (1.05-1.37, P less than 0.02) rise in the risk of death or relapse. In the patients with myeloid leukemias the mean initial HbF concentration was also higher (3.4 g/l; 0.5-19.5 g/l) than in the patients with ALL (1.1 g/l; 0-18.7 g/l; P = 0.08). Our results indicate that the degree of increase in HbF synthesis is associated with the degree of malignancy: the more aggressive the disease, the more augmented is the synthesis of HbF.
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