title: Secretion of creatine kinase MB isoenzyme by an immature teratoma with predominant rhabdomyosarcomatous elements.
abstract: A 37-year-old man with metastatic immature (malignant) teratoma with prominent rhabdomyosarcomatous elements had markedly increased activity of creatine kinase (EC 2.7.3.2) MB in serum. There was no electrocardiographic evidence of infarction or ischemia, and autopsy revealed no myocardial infarction, significant coronary atherosclerosis, myocarditis, or invasion of the heart by tumor. A high proportion of the creatine kinase activity in a homogenate of the tumor was attributable to the MB isoenzyme. Persistent increases of creatine kinase-MB and an unusually high MB isoenzyme activity, out of proportion to total creatine kinase activity, may indicate a nonmyocardial origin of this isoenzyme.
authors.affiliation: Department of Pathology, State University of New York, Stony Brook 11794.
authors.forename: K
authors.initials: K
authors.lastname: Emancipator
authors.forename: A P
authors.initials: AP
authors.lastname: Kudelka
authors.forename: G
authors.initials: G
authors.lastname: Bradford
authors.forename: K A
authors.initials: KA
authors.lastname: Leonard
authors.forename: M H
authors.initials: MH
authors.lastname: Zarrabi
mesh_terms: D000328:Adult; D003402:Creatine Kinase / Q000097:blood*; D006801:Humans; D007527:Isoenzymes; D008297:Male; D008479:Mediastinal Neoplasms / Q000201:enzymology; D012208:Rhabdomyosarcoma / Q000201:enzymology*; D013724:Teratoma / Q000201:enzymology*
chemical_list: D007527:Isoenzymes; D003402:Creatine Kinase