Volume 206, Issue 2 pp. 703-712
ORIGINAL PAPER

Impact of HbE mutation on the clinical severity of HbH disease: A multicentre study from Thailand

Duantida Songdej

Duantida Songdej

Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand

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Nattiya Teawtrakul

Nattiya Teawtrakul

Division of Hematology, Department of Internal Medicine, Srinagarind Hospital, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand

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Napat Laoaroon

Napat Laoaroon

Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand

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Patcharee Komvilaisak

Patcharee Komvilaisak

Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand

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Pornpun Sripornsawan

Pornpun Sripornsawan

Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand

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Pacharapan Surapolchai

Pacharapan Surapolchai

Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Thammasat University, Pathum Thani, Thailand

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Chattree Hantaweepant

Chattree Hantaweepant

Division of Hematology, Department of Medicine, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand

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Adisak Tantiworawit

Adisak Tantiworawit

Division of Hematology, Department of Internal Medicine, Chiang Mai University, Chiang Mai, Thailand

Thalassemia and Hematology Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand

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Sasinee Hantrakool

Sasinee Hantrakool

Division of Hematology, Department of Internal Medicine, Chiang Mai University, Chiang Mai, Thailand

Thalassemia and Hematology Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand

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Supanun Lauhasurayotin

Supanun Lauhasurayotin

Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Bangkok, Thailand

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Kitti Torcharus

Kitti Torcharus

Division of Pediatric Hematology/Oncology, Department of Pediatrics, Phramongkutklao College of Medicine, Bangkok, Thailand

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Pranee Sutcharitchan

Pranee Sutcharitchan

Division of Hematology, Department of Internal Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Bangkok, Thailand

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Noppacharn Uaprasert

Noppacharn Uaprasert

Division of Hematology, Department of Internal Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Bangkok, Thailand

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Krissana Panrong

Krissana Panrong

Division of Hematology, Department of Internal Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Bangkok, Thailand

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Panachai Silpsamrit

Panachai Silpsamrit

Division of Hematology, Department of Medicine, Phramongkutklao College of Medicine, Bangkok, Thailand

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Arunotai Meekaewkunchorn

Arunotai Meekaewkunchorn

Queen Sirikit National Institute of Child Health, Bangkok, Thailand

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Pimlak Charoenkwan

Pimlak Charoenkwan

Thalassemia and Hematology Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand

Division of Hematology and Oncology, Department of Pediatrics, Chiang Mai University, Chiang Mai, Thailand

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Bunchoo Pongtanakul

Corresponding Author

Bunchoo Pongtanakul

Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand

Correspondence

Bunchoo Pongtanakul, Division of Hematology and Oncology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, Bangkoknoi, Bangkok 10700, Thailand.

Email: [email protected]

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Red Blood Cell Disorders Study Group

Red Blood Cell Disorders Study Group

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First published: 30 October 2024
Citations: 1

Summary

Haemoglobin (Hb) H disease and HbH disease with co-inherited HbE mutation are the most prevalent forms of α-thalassaemia in Southeast Asia. Data were limited when comparing clinical phenotypes between these two patient groups. We conducted a Thai multicentre study and enrolled 588 patients [median (IQR) age 13.0 (6.7–20.3) years], including those with deletional HbH disease with (n = 47) and without (n = 187) co-inherited HbE mutation and non-deletional HbH disease with (n = 101) and without (n = 253) co-inherited HbE mutation. Patients with HbH disease with co-inherited HbE mutation suffered more severe manifestations than those without. This observation was more pronounced in patients with non-deletional HbH disease. A greater proportion of patients with non-deletional HbH disease with co-inherited HbE mutation (43.6%) eventually required regular transfusions compared to those without (30.4%, p = 0.019). Among those with non-deletional HbH disease who did not require regular transfusions, Hb levels were lower in patients with co-inherited HbE mutation [8.1 (7.2–8.6) vs. 8.8 (8.2–9.5) g/dL, p < 0.001]. Among patients requiring regular transfusions who underwent splenectomy, 11/12 patients with non-deletional HbH disease stopped transfusion compared with 1/3 in non-deletional HbH disease with co-inherited HbE mutation group (p = 0.024). These findings provide insights for the clinical monitoring and management of HbH disease in the region.

Graphical Abstract

Haemoglobin H (HbH) disease with co-inheritance of HbE mutation is frequently found in Southeast Asia. This large multicentre study with a total of 588 enrolled patients demonstrated that co-inheritance of HbE mutation was associated with a higher rate of on-demand or chronic transfusions compared to those with HbH disease alone. The impact of HbE co-inheritance was mainly observed in patients with non-deletional HbH disease. The graph shows the proportion of patients in each diagnosis group becoming transfusion-dependent at different ages.

CONFLICT OF INTEREST STATEMENT

The authors declare no conflicts of interest.

DATA AVAILABILITY STATEMENT

The anonymized data obtained and analysed in this study are available from the corresponding author upon reasonable request.

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