It is important to measure the concentration of the tumor
marker by the same method. Different antibodies, matrix and
calibrator which are used in different methods may give different
results. This means that different commercial tests give
results for tumor markers that are not mutually comparable
(13). The aim of this study was to evaluate the reliability of
the determination a tumor marker HE4 in comparison with
CA125 on the Elecsys analyzer 2010 in epithelial ovarian
cancer, benign ovarian cyst and healthy controls.