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  • Title: Eutopic expression of placental-like alkaline phosphatase in testicular tumors.
    Author: Jeppsson A, Wahren B, Brehmer-Andersson E, Silfverswärd C, Stigbrand T, Millán JL.
    Journal: Int J Cancer; 1984 Dec 15; 34(6):757-61. PubMed ID: 6511123.
    Abstract:
    Very high levels of placental-like alkaline phosphatases (PLAP-like enzymes) were observed in tissues from 13 typical seminomas. Four tumors with seminoma components contained these enzymes to varying degrees, and other testicular tumors had them in smaller or non-detectable amounts. Analysis using monoclonal antibodies produced against the common placental alkaline phosphatase (PLAP) phenotypes and enzyme inhibition studies with amino acids and peptides showed the PLAP-like enzymes present in seminoma to be similar to those PLAP-like enzymes which are expressed in lower amounts in two embryonal carcinomas and in trace amounts in normal testicular tissue. These similarities suggest that the increased expression of PLAP-like enzymes in seminomas results from enhanced eutopic expression of enzymes found in normal testis.
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