The above described changes in the haemostatic system in acute leukemias are well known and underlined by many authors [1, 5, 6, 9]. It should be stressed that the results of particular nonspecific hemostatic tests in some patients may be within the normal range in spite of significant alterations in the activity of some blood coagulation factors and the presence of hemorrhagic symptoms. In the observations of some authors the factor VIII level is distinctly increased in the majority of acute leukemic cases, whereas the vitamin K-dependent blood coagulation factors show a low activity in some patients [6, 9]. It is not easy to interpret the different behaviour of the factor XI and XII level especially before antileukemic treatment. In 3/4 of all studied cases the factor XI activity was low, whereas the factor XII level was high in 1/4 of patients above the normal range. It may be that there is a specific inhibitor against the factor XI that is produced in acute leukemia. It must be stressed that the level of factor XI shows normal values during hematological remission.
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