A Study of Phenyl Phosphate and α-Naphthyl Phospate as Substrates for SerumAcid Phosphatases

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Abstract
In 120 patients without cancer and 87 with prostatic cancer, the α-naphthyl phosphate substrate method proved as sensitive as or more sensitive than the tartrate inhibitable phenyl phosphate substrate method. The major nonprostatic acid phosphatase fraction of blood had properties unlike that of the red blood cell enzyme and was destroyed at room temperature, pH 6.2. Subtle local extensions of prostatic cancer were associated with small but significant increases in mean serum acid phosphatase concentration.

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