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A genetic score for the prediction of beta-thalassemia severity.

Abstract：

:Clinical and hematologic characteristics of beta(β)-thalassemia are determined by several factors resulting in a wide spectrum of severity. Phenotype modulators are: HBB mutations, HBA defects and fetal hemoglobin production modulators (HBG2:g.-158C>T polymorphism, HBS1L-MYB intergenic region and the BCL11A). We characterized 54 genetic variants at these five loci robustly associated with the amelioration of beta-thalassemia phenotype, to build a predictive score of severity using a representative cohort of 890 β-thalassemic patients. Using Cox proportional hazard analysis on a training set, we assessed the effect of these loci on the age at which patient started regular transfusions, built a Thalassemia Severity Score, and validated it on a testing set. Discriminatory power of the model was high (C-index=0.705; R(2)=0.343) and the validation conducted on the testing set confirmed its predictive accuracy with transfusion-free survival probability (P<0.001) and with transfusion dependency status (Area Under the Receiver Operating Characteristic Curve=0.774; P<0.001). Finally, an automatized on-line calculation of the score was made available at http://tss.unica.it. Besides the accurate assessment of genetic predictors effect, the present results could be helpful in the management of patients, both as a predictive score for screening and a standardized scale of severity to overcome the major-intermedia dichotomy and support clinical decisions.

journal_name

Haematologica

journal_title

Haematologica

authors

Danjou F,Francavilla M,Anni F,Satta S,Demartis FR,Perseu L,Manca M,Sollaino MC,Manunza L,Mereu E,Marceddu G,Pissard S,Joly P,Thuret I,Origa R,Borg J,Forni GL,Piga A,Lai ME,Badens C,Moi P,Galanello R

doi

10.3324/haematol.2014.113886

subject

Has Abstract

pub_date

2015-04-01 00:00:00

pages

452-7

issue

4

eissn

0390-6078

issn

1592-8721

pii

haematol.2014.113886

journal_volume

100

pub_type

杂志文章,多中心研究

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