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Thromb Haemost 2014; 111(05): 851-861
DOI: 10.1160/TH13-08-0690
Blood Coagulation, Fibrinolysis and Cellular Haemostasis
Schattauer GmbH

Haemophilia A mutations in patients with non-severe phenotype associated with a discrepancy between one-stage and chromogenic factor VIII activity assays

Anna Pavlova
1   Institute of Experimental Haematology and Transfusion Medicine, University Clinic Bonn, Germany
,
Daniel Delev
2   Clinic and Policlinic for Neurosurgery, University Clinic Bonn, Bonn, Germany
,
Behnaz Pezeshkpoor
1   Institute of Experimental Haematology and Transfusion Medicine, University Clinic Bonn, Germany
,
Jens Müller
1   Institute of Experimental Haematology and Transfusion Medicine, University Clinic Bonn, Germany
,
Johannes Oldenburg
1   Institute of Experimental Haematology and Transfusion Medicine, University Clinic Bonn, Germany
› Author Affiliations
Further Information

Publication History

Received: 22 August 2013

Accepted after minor revision: 16 January 2013

Publication Date:
01 December 2017 (online)

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Summary

About one-third of patients with non-severe haemophilia A (HA) show a discrepancy of factor (F)VIII activity (FVIII:C) measured by one-stage (FVIII:C1st), two-stage assays or the chromogenic method (FVIII:Cchr). The aim of the study was to characterise the mutation profile in patients with FVIII:C assay discrepancies. FVIII:C discrepancy was considered significant if the calculated ratio between FVIII:C1st and FVIII:Cchr was ≤ 0.6. In 16 patients FVIII:C1st was higher than FVIII:Cchr. The reverse phenomenon was observed in 83 patients. Genetic analysis revealed 23 different missense mutations of which 17 were novel. Most mutations, exhibiting a higher FVIII:C1st were localised in the A1-A2-A3 interface. The majority of mutations associated with FVIII:Cchr>FVIII:C1st discrepancy were located close to or within the thrombin cleavage sites, FIX or vWF binding sites. Our data show a correlation between FVIII:C and thrombin generation testing with a clear differentiation between patients with haemophilia and normal controls. However, in the subgroup of FVIII:C1st>FVIII:Cchr discrepancy, the endogenous thrombin potential and peak thrombin parameters were similar to non-discrepant haemophilia patients, while in the inverse discrepancy FVIII:Cchr>FVIII:C1st, these variables showed values close to that of the normal control group. Certain hereditary F8 mis-sense mutations cause discrepancy in FVIII:C as measured with different assays. This can lead to failure in diagnosing HA or incorrectly classifying the severity of the disease. Therefore, we recommend that initial diagnosis of non-severe HA phenotypes should be based on results of both FVIII:C1st and FVIII:Cchr assays.

Keywords

Haemophilia A - discrepant assay - missense mutations
 

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