The serum protein binding secretory prostatic acid phosphatase (PAP) and lysosomal placental acid phosphatase (LAP) was purified using affinity chromatography on gels containing immobilized acid phosphatases. The protein, which could be eluted from these enzyme affinity gels only with 0.05
HCl (pH 2.0), was shown to be apolipoprotein A‐I (apo A‐I), the main structural protein of high density lipoprotein (HDL).
We report a patient having advanced prostatic cancer and serum immunoreactive prostate-specific acid phosphatase concentrations of up to 8.9 mg/l, which is more than 3000 times the upper limit of our health-associated reference interval. following orchiectomy, the enzyme concentration decreased to 1.5 mg/l in 5 days, and to 3.6 micrograms/l within 1.5 months and to 1.4 micrograms/l within 6 months.
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