TOPPS: Limit prophylactic platelets to select groups
AT THE ANNUAL MEETING OF THE AMERICAN SOCIETY OF HEMATOLOGY
Major Finding: The primary endpoint of WHO grade 2 or higher bleeding was seen in 50% with no prophylaxis (151 of 300) and 43% receiving prophylactic platelet transfusion (128 of 298).
Data Source: Randomized controlled trial of prophylactic vs. nonprophylactic platelet transfusions in patients with hematologic malignancies.
Disclosures: TOPPS was funded by the National Health Service Blood and Transplant. Dr. Stanworth and Dr. Dzik reported no disclosures.
ATLANTA – The broad use of prophylactic platelet transfusions in adults with hematologic malignancies and severe thrombocytopenia will likely be narrowed in the wake of the randomized, international TOPPS trial.
The primary endpoint of grade 2 or higher bleeding, by World Health Organization criteria, was seen in 50% with no prophylaxis (151 of 300) and 43% receiving a prophylactic platelet transfusion (128 of 298). The adjusted difference in proportions was 8.4%, which fell below the 15.2% upper limit for confidence interval set for TOPPS (Trial of Prophylactic Platelet Transfusions).
Patrice Wendling/IMNG Medical Media
"This multicenter trial has not shown that a no-prophylaxis platelet transfusion policy is noninferior to prophylaxis," lead author Dr. Simon Stanworth said at the annual meeting of the American Society of Hematology.
A predefined subgroup analysis, however, found a significant difference in the primary endpoint between patients undergoing autologous stem cell transplantation (ASCT), who comprised 70% of the study population, and those receiving other treatments such as induction chemotherapy for acute myeloid leukemia (AML) or allogeneic bone marrow transplantation (P value = .04).
The rate of grade 2 or higher bleeding was very similar among patients undergoing autologous transplantation with or without prophylaxis (45% vs. 47%), while a clear benefit signal was seen in the subgroup of AML and allograft patients receiving treatment plus prophylaxis, compared with no prophylaxis (38% vs. 58%).
"Based on the results, the role of prophylactic platelet transfusions in different patient groups is varied and needs to be considered further," said Dr. Stanworth, a consultant hematologist with National Health Service Blood and Transplant, Oxford (England) University Hospital.
The finding that prophylactic platelets confer no advantage among those getting autologous transplants, however, could open up the opportunity to save millions of dollars in health care costs by skipping this unbeneficial treatment. An estimated 2 million platelets were transfused in the United States in 2008, a significant 16.7% increase from 2006, according to the latest National Blood Collection and Utilization Survey Report.
The results of TOPPS will likely change practice, but it will take time, Dr. Walter Dzik, codirector of the blood transfusion service at Massachusetts General Hospital, Boston, said in an interview.