Neutrophil function during immunotherapy for acute myelogenous leukemia in remission

Area of Science:

• Immunology
• Hematology
• Oncology

Background:

• Acute myelogenous leukemia (AML) treatment often involves maintenance chemotherapy.
• Immunotherapy combined with chemotherapy may improve remission duration in AML.
• The impact of combined therapy on immune cell function requires elucidation.

Purpose of the Study:

• To investigate the effects of chemotherapy (CT) and combined chemotherapy plus immunotherapy (CT + IT) on polymorphonuclear neutrophil (PMN) functions in AML patients in remission.
• To compare PMN functions between patient groups and healthy controls.

Main Methods:

• Studied PMN migration, bactericidal capacity against Staphylococcus aureus, adherence to nylon fibers, and chemiluminescence during phagocytosis.
• Compared 18 AML patients in remission (7 on CT, 11 on CT + IT) with healthy controls.

Main Results:

• PMN migration was reduced in both patient groups compared to controls.
• PMN migration stimulated by serum was lower only in the CT + IT group.
• Bactericidal capacity against S. aureus was reduced in the CT + IT group but normal in the CT group.
• Neutrophil adherence was higher in the CT + IT group compared to controls and the CT group.
• No significant differences in chemiluminescence during phagocytosis were observed.

Conclusions:

• Monthly maintenance CT did not significantly impair investigated PMN functions.
• Immunotherapy in AML treatment was associated with impaired neutrophil migratory and bactericidal functions and enhanced adherence.
• The clinical significance and underlying mechanisms of these PMN alterations require further investigation.