title: Thalassemia Phenotypes and Genotypes in Taiwan: A Retrospective Study Based on Thalassemia Screening of Young Men for Military Conscription.
abstract: Prenatal thalassemia studies from Taiwan show that one-third of fetuses with genetic abnormalities have β-thalassemia major (β-TM). However, the phenotypes and genotypes of adult thalassemia warrant further investigation. From September 2006 to April 2014, 741 male candidates drafted for military service with mean corpuscular volume (MCV) <80 fL and serum ferritin >20 µg/L were analyzed. The results showed that the detection rates of α- and β-thalassemia (α- an β-thal) were 50.20% (372/741) and 49.12% (364/741), respectively. Only five patients (0.67%) were diagnosed with both α- and β-thal. The - -(SEA)/αα mutation was found in 76.88% (286/372) of α-thal patients. Heterozygous mutations in IVS-II-654 (C > T) and codons 41/42 (-TCTT) accounted for 55.77% (203/364) of β-thal cases. The leukocyte counts for α- and β-thal were 6241.74 ± 1552.99 and 6622.87 ± 1814.41 × 10(9)/L, respectively (p = 0.007). The α-thal patients had lower red blood cell (RBC) mass (5.85 ± 0.44 × 10(12)/L vs. 6.09 ± 0.45 × 10(12)/L; p < 0.001) and higher hemoglobin (Hb) (12.82 ± 0.72 vs. 12.35 ± 0.71 g/dL; p < 0.001) than β-thal patients. Mean serum ferritin values were 169.67 and 241.36 µg/L, respectively, in α- and β-thal patients (p < 0.001), indicating more profound ineffective erythropoiesis in β-thal. Only four of the 741 patients underwent further hematological follow-up. Our study suggests that iron overload might be a potential problem in β-thal patients; therefore, regular follow-up is highly recommended.
authors.affiliation: Division of Hematology/Medical Oncology, Department of Medicine, Taichung Veterans General Hospital , Taichung City , Taiwan .
authors.forename: Hsiao-Wei
authors.initials: HW
authors.lastname: Lee
authors.forename: Shao-Min
authors.initials: SM
authors.lastname: Han
authors.forename: Youngsen
authors.initials: Y
authors.lastname: Yang
authors.forename: Tseng-Hsi
authors.initials: TH
authors.lastname: Lin
authors.forename: Huey-En
authors.initials: HE
authors.lastname: Tzeng
authors.forename: Kuang-Hsi
authors.initials: KH
authors.lastname: Chang
authors.forename: Wen-Li
authors.initials: WL
authors.lastname: Hwang
authors.forename: Chieh-Lin J
authors.initials: CL
authors.lastname: Teng
mesh_terms: D000328:Adult; D003062:Codon; D004909:Erythrocyte Indices; D005820:Genetic Testing; D005838:Genotype; D006801:Humans; D008297:Male; D008889:Military Personnel; D009154:Mutation; D010641:Phenotype; D012189:Retrospective Studies; D013624:Taiwan / Q000453:epidemiology; D013789:Thalassemia / Q000175:diagnosis* / Q000453:epidemiology / Q000235:genetics*; D055815:Young Adult; D017085:alpha-Thalassemia / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics; D017086:beta-Thalassemia / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics
chemical_list: D003062:Codon
keywords: Hemoglobin (Hb); Taiwan; mutation; thalassemia