we describe a case of choriocarcinoma in which increased concentrations of beta-choriogonadotropin subunits in serum indicated recurrence of metastasis long before the tumor could be confirmed by visualization techniques , while intact choriogonadotropin remained normal ( less than 5 int . units/l ) .
C0106132
beta-choriogonadotropin subunits
C0018062
choriogonadotropin