Blood microvesicles during chronic lymphoproliferative diseases.

The levels of CD19 (+) and CD20(+) microvesicles were estimated in the blood of patients with B-cell chronic lymphocytic leukemia and indolent non-Hodgkin lymphoma by flow cytometry method. It was found that the number of B cell microvesicles is several times higher in patients than in volunteers. The level of CD20 (+) microvesicles directly correlated with the number of CD20(+) lymphocytes in patients with chronic lymphoproliferative diseases. Extramedullary tumors cells can be a source of CD19 (+) microvesicles.