Procoagulant cellular activity and disseminated intravascular coagulation in acute non-lymphoid leukaemia.

The procoagulant cellular activity (PCA) of intact and lysed leukaemic cells was evaluated at diagnosis in 23 patients with acute non-lymphoid leukaemia (ANLL). The leukaemic cells of all 13 patients having DIC feature (excess of fibrin monomers, serum FDP and plasma fibrino-peptide A) showed a significant (P less than 0.0001) increase of PCA, while a pattern similar to that of normal granulocytes and lymphomonocytes was observed in the remaining 10 patients without evidence of DIC. When the patients were subdivided according to the FAB cytological classification, features of DIC and increased PCA were demonstrated in 3/3 M3 patients, 5/6 M5 patients and only in 5/14 remaining patients. These findings indicate that in ANLL patients: (1) the increased PCA of leukaemic cells is closely related to the occurrence of DIC; (2) the increased PCA seems related to the differentiation line and maturation level of the leukaemic cells.