The electrophoretic mobility test (EMT), modified only slightly, was applied to a group of 25 patients suffering from gynecological cancer as well as to a control group of the same number. On an average, cancer patients demonstrated an inhibition of 5.5%, control patients an inhibition of 2.3%. These mean values near the discrimination border are caused in 14 false (positive or negative) results and in further 8 results valued ambiguous at inhibition quotes between 3 and 5%. Neither methodological nor casuistical analyses yielded clear conclusions about the reasons of recurrent test failures. Therefore, the manner of measurement becomes more interesting for us as more as this method does not include objectivity and precise documentation of the physical proceedings in a sufficient range. At least, we refer to an alternative method of measurement equalizing these problems by photographical documentation.