The level of CA 72-4 in serum has been measured in various diseases by an immunoradiometric assay using CA 72-4 RIA Kit for an evaluation of its clinical significance as a possible tumor marker. CA 72-4 showed a high positive rate in patients with ovarian and bile duct cancers. In contrast, the false positive rate was low in benign gynecological and digestive diseases. Serum CA 72-4 was found to be increased in patients with a mucinous cystadenocarcinoma and in other histological types in the early stages of an ovarian cancer. Further, the serum CA 72-4 level changed in parallel with the clinical course of the ovarian cancer. Therefore, our results suggest that measurement of CA 72-4 be combined with measurement of CA 125, so as to provide a better sensitivity and specificity in monitoring an ovarian cancer.
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