MUC16 and cancer: Correlations between CA 125 levels and histolopathological characteristics; Grade, stage and subtype: Sandwich ELISA method for determination of CA 125 tumor marker revealed that the mean serum CA125 tumor marker levels in malignant carcinomas were 499.84 U/ml (56 ranging from U/ml until 1500 U/ml), which were significantly higher than the normal titer of CA125 ranges.