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Cytochemical studies in leukaemias.

One hundred cases of acute leukaemia were studied, by Romanowsky stains and by cytochemical stains such as Sudan Black B, Periodic Acid Schiff, Alkaline phosphatase and Peroxidase stains. Cases difficult to diagnose by Romanowsky stained smears were easily classified by these supplementary stains. Their importance as supplements to the routine Romanowsky staining in the diagnosis of leukaemia is emphasized and the division of acute lymphoblastic leukaemia based on these patterns is suggested.