(1) To estimate the proportion of subjects with homozygous sickle cell disease who have a benign clinical course, and (2) to assess factors that may be predictive of henign desease.
Subjects (n=280) were participants in a longitudinal cohort study of sickle cell disease.
They were classified as henign or control based on clinical history from birth to age 13 years old.
Associations with growth, hematology, and an index of social status were investigated.
Benign disease occurred in 43 (15%) patients.
Neither growth nor social status were related to benign disease.
There were only two statistically independent associations : alpha thalassemia status and average steady state fetal hemoglobin (HbF).
Patients with a normal complement of alpha globin genes were 2.2 (1.0,4.9) times more likely to have henign disease than those with gene deletion, and were less likely to have frequent painful crises, dactylitis, and bone necrosis The odds of having benign disease were 1.09 (1.02,1.17) times higher for cach unit increase in HbF, and 44% of subjects with HhF in the top decile (HhF>13.8%) of the distribution had henign disease.
There was no evidence for a threshold effect of high HhF on benign disease.
A benign clinical course of sickle cell disease may occur in Jamaica and is associated with a normal alpha globin gene complement, and high levels of HhF.
Ability to predict benign disease at birth is limited.
Mots-clés Pascal : Anémie hématie falciforme, Evolution, Pronostic, Facteur prédictif, Homme, Hémoglobine foetale, Thalassémie alpha, Développement staturopondéral, Classe sociale, Statut socioéconomique, Etude longitudinale, Jamaïque, Antilles, Amérique Centrale, Amérique, Hémopathie, Anémie hémolytique, Hémoglobinopathie, Maladie héréditaire
Mots-clés Pascal anglais : Sickle cell anemia, Evolution, Prognosis, Predictive factor, Human, Fetal hemoglobin, alpha-Thalassemia, Somatic growth, Social class, Socioeconomic status, Follow up study, Jamaica, West Indies, Central America, America, Hemopathy, Hemolytic anemia, Hemoglobinopathy, Genetic disease
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0238668
Code Inist : 002B19A01. Création : 11/06/1997.