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  • Title: OKT-3/cyclophosphamide up-regulation of peripheral blood killer-lymphocyte subsets in human cancer patients.
    Author: Wiseman C, Hood Y, Presant C, Kennedy P.
    Journal: Mol Biother; 1991 Jun; 3(2):63-7. PubMed ID: 1832869.
    Abstract:
    We have initiated a clinical trial in 7 patients using low-dose OKT-3 monoclonal antibody, 50 mcg, followed 24 hours later by low-dose cyclophosphamide, 300 mg/m2. Complete data in 5 patients indicate a significant up-regulation of the number of peripheral blood lymphocytes. Before treatment, the mean (+/- standard deviation) total lymphocyte count was 524 (+/- 364)/mm3. After 4 weeks the value rose 64% to 860 (+/- 243)/mm3, (P less than .025, Student's t test). Similar changes were observed for the CD3+, CD4+, CD8+, and CD16+ (NK) lymphocyte subsets. The mean CD3+ population rose from 372 (+/- 325)/mm3 to 593 (+/- 300)/mm3 (P less than .025), the mean CD4+ group rose from 209 (+/- 142)/mm3 to 321 (+/- 104)/mm3 (P less than .05), the CD8+ cells rose from 218 (+/- 205)/mm3 to 341 (+/- 197)/mm3 (P less than .05), and the CD16+ (NK cells) rose from 80 (+/- 37)/mm3 to 157 (+/- 63)/mm3 (P less than .025). Statistically significant up-regulation occurred for all patients. The fraction of each lymphocyte subset and the T4/T8 ratio did not change. OKT-3/cyclophosphamide appears to modulate the number of circulating lymphocytes in human cancer patients.
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