Abstract
Measurements of serum and bone marrow acid phosphatase were made by 3 enzymatic methods, alpha-naphthyl phosphate, beta-glycerol phosphate, and thymolphthalein monophosphate, and ocmpared to a double antibody radioimmunoassay. Serum and bone marrow acid phosphatase levels were studied in 46 controls with histologically proven benign prostatic hyperplasia and in 135 patients with various stages of prostatic carcinoma. In the control group the upper limit for bone marrow acid phosphatase was found to be significantly higher than the corresponding serum limit with respect to the enzymatic assays studied. The radioimmunoassay was the only method suitable for the analysis of the prostatic acid phosphatase content of bone marrow. A larger number of elevations were noted in patients with extracapsular and metastatic disease when prostatic acid phosphatase measurement was carried out by radioimmunoassay as compared to enzymatic methods. However, only 8% of the patients with intracapsular disease had elevations of prostatic acid phosphatase as measured by radioimmunoassay. Additional standardisation of immunological methods and clinical trials is required before comparison can be made of results from various centres using immunological methods for the measurement of prostatic acid phosphatase and a true assessment made of the usefulness of this procedure.
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