July 1, 1972Blood
Immunologic Rebound After Cessation of Long-term Chemotherapy in Acute Leukemia
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Discussion
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Implication
Cohort study reveals age-dependent immune recovery in pediatric acute leukemia after chemotherapy cessation, indicating bone marrow lymphocytosis reflects normal rebound rather than relapse.
Key Points
- To determine the kinetics of lymphocyte repopulation in blood and bone marrow, immunoglobulin synthesis, and antibody production following cessation of long-term chemotherapy in children with acute lymphocytic leukemia in continuous remission.
- Monitored blood and bone marrow lymphocyte counts, serum IgG and IgM concentrations, and specific viral antibody titers in pediatric patients with acute lymphocytic leukemia in continuous remission for 2.5 to 3 years after stopping therapy.
- Evaluated recovery dynamics stratified by the patient's age at the initiation of chemotherapy (<5 years versus older).
- Blood and bone marrow lymphocytes, as well as serum IgG and IgM, increased significantly after chemotherapy cessation in patients younger than 5 years old at diagnosis, but not in older patients.
- Bone marrow lymphocytosis occurred earlier and more prominently than blood lymphocytosis, frequently exceeding 40% cellularity without signifying disease recurrence.
- One-fourth of patients demonstrated a rise in antibodies against Hong Kong influenza virus despite no evidence of re-exposure to the antigen.
Cite This Study
Borella et al. (1972) studied this question.