Serial study of T lymphocytes in childhood leukemia during remission

• Published in: Pediatric hematology and oncology Vol. 10; no. 2; p. 129
• Main Authors: Lovat, P E, Robinson, J H, Windebank, K P, Kernahan, J, Watson, J G
• Format: Journal Article
• Language: English
• Published: England 1993
• Subjects: Adolescent; Child; Child, Preschool; Humans; Infant; Interleukin-2 - biosynthesis; Interleukin-2 - pharmacology; Interleukin-4 - biosynthesis; Interleukin-4 - pharmacology; Lymphocyte Activation; Precursor Cell Lymphoblastic Leukemia-Lymphoma - drug therapy; Precursor Cell Lymphoblastic Leukemia-Lymphoma - immunology; T-Lymphocyte Subsets - immunology; T-Lymphocytes - immunology
• ISSN: 0888-0018
• DOI: 10.3109/08880019309016546

Peripheral blood T lymphocyte numbers and function were studied in 22 children on UKALL X maintenance chemotherapy over a 2-year period, and results were compared with 20 healthy children. CD4 and CD8 subsets were enumerated using indirect immunofluorescence, and specific (HSV-1) and polyclonal (Con A, PWM) activation was studied by proliferation and IL-2/IL-4 production in vitro. T lymphocytes were significantly decreased with a greater fall in CD4 than CD8 T lymphocyte numbers. Proliferation responses were slightly but significantly decreased whereas IL-2 and IL-4 production were not significantly different from control values. These findings suggest that decreased numbers of CD4 helper T cells may be the most important factor in clinical immunodeficiency during maintenance chemotherapy for cALL contributing to increased susceptibility to opportunistic infections and argue against the presence of T lymphocytes with defective function.