Peripheral blood lymphocytes from 21 patients with aleukaemic stages of mycosis fungoides were studied with monoclonal T cell antibodies. Patients with erythematous eruptions or infiltrated plaques (group I) had a higher percentage of OKT4+ cells than patients with a tumorous stage (group II) or normal subjects (p = 0.05). OKT8+ cells were decreased in group I patients whereas in group II they were usually normal or increased (p less than 0.02). These data indicate that with advancing stage of the disease a different pattern of imbalance of T-cell subsets is being established.
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