Abnormal immune parameters in HIV‐seronegative haemophilic patients

Summary. In HIV‐seronegative haemophiliac patients abnormal immune parameters have been demonstrated. In this review data on these abnormalities, their aetiology and clinical consequences are summarized and discussed. The data reviewed show abnormalities at different levels of the adaptive immune system. Most of the reported abnormalities regard lymphocyte subsets and their function, both in vivo and in vitro testing. Strong evidence has not been found for a causal relation between abnormalities and the consumption of factor VIII concentrates nor the purity of the concentrates. It seems likely that certain contaminants in the factor VIII concentrates have an inhibiting effect on lymphocytes and monocytes. Two clinical consequences of the abnormalities have been suggested: a higher susceptibility for infections and a greater risk to develop malignancies. Data on these consequences, however, are contradicting and not in agreement with the good results of long‐term treatment of HIV‐seronegative haemophiliac patients with factor VIII concentrates. The studies reviewed give no convincing evidence that more pure concentrates are advantageous in HIV‐negative haemophiliacs.