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Case report: changes in creatine kinase isoenzymes after myocardial infarction in a patient with prostatic carcinoma.

The detection of serum proteins that can serve as tumor markers has been reported with increased frequency in patients with various localized or metastatic cancers. Many of these reports have concerned patients with prostatic carcinoma, who had normal or increased concentrations of creatine kinase (EC 2.7.3.2) in serum. In many instances the creatine kinase BB isoenzyme was increased in these patients. I describe the case of a patient with carcinoma of the prostate (stage D), who had a myocardial infarction three to four days after admission. The serum activity of the MM, MB, and BB isoenzymes changed markedly after the infarction. These changes and the possible tissue source(s) of this isoenzyme are discussed in relationship to the clinical symptoms of the patient.