Relevance of circulating immune complexes in childhood acute lymphoblastic leukaemia.

Circulating immune complexes have been measured using the (125I)C1q binding test in 216 sera from 135 children with acute lymphoblastic leukaemia. Increased circulating immune complexes were detectable in 10.7% of the sera and 10.4% of the children. There was no correlation between the presence of circulating immune complexes and prognosis, but a strong correlation with a history of recent infection.