Primary HBB gene mutation severity and long-term outcomes in a global cohort of β-thalassaemia

the International Working Group on Thalassemia (IWG-THAL)

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In β-thalassaemia, the severity of inherited β-globin gene mutations determines the severity of the clinical phenotype at presentation and subsequent transfusion requirements. However, data on associated long-term outcomes remain limited. We analysed data from 2109 β-thalassaemia patients with available genotypes in a global database. Genotype severity was grouped as β00, β0+, β++, β0++, β+++, and β++++. Patients were followed from birth until death or loss to follow-up. The median follow-up time was 34·1 years. Mortality and multiple morbidity outcomes were analyzed through five different stratification models of genotype severity groups. Interestingly, β0 and β+ mutations showed similar risk profiles. Upon adjustment for demographics and receipt of conventional therapy, patients with β00, β0+, or β++ had a 2·104-increased risk of death [95% confidence interval (CI): 1·176–3·763, P = 0·011] and 2·956-increased odds of multiple morbidity (95% CI: 2·310–3·784, P < 0·001) compared to patients in lower genotype severity groups. Cumulative survival estimates by age 65 years were 36·8% for this subgroup compared with 90·2% for patients in lower genotype severity groups (P < 0·001). Our study identified mortality and morbidity risk estimates across various genotype severity groups in patients with β-thalassaemia and suggests inclusion of both β+ and β0 mutations in strata of greatest severity.

Original languageEnglish
JournalBritish Journal of Haematology
DOIs
Publication statusAccepted/In press - 2021
Externally publishedYes

Keywords

  • genotype
  • morbidity
  • mortality
  • phenotype
  • survival

ASJC Scopus subject areas

  • Hematology

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