Sézary syndrome: immunocytological and cytochemical variability of Sézary cells

The characteristic large cells in the blood of a patient with Sézary syndrome underwent immunocytological and cytochemical changes during polychemotherapy, which caused transient regression of skin lesions. Tartrate-resistant acid phosphatase was demonstrable in a few cells only after chemotherapy; initially, only 2% T cells and 26% B cells could be demonstrated in the blood by immunocytological methods; after cytostatic therapy, 35% T cells but no B cells were detected.