
NEW ORLEANS-Positive/negative purging of peripheral blood stem cell (PBSC) grafts allows preparation of highly purified CD34+ fractions and up to 6 log of tumor cell depletion in patients with chronic lymphocytic leukemia (CLL), according to a study conducted at the University of Kiel, Germany. Peter Dreger, MD, reported the results at the 41st annual meeting of the American Society of Hematology (ASH).