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Aim: Based on evidence that African–American (AA) women have lower CA125 values than Caucasian (C) women, we investigated this to see if this disparity would have an impact on ovarian cancer detection using CA125 and multivariate index assay (MIA). Materials &amp; methods: Serum from two prospective trials of 1029 (274 malignancies [250 C/24AA]) were analyzed for CA125 and MIA results. Clinical performance was calculated. Results: Sensitivity of MIA in Caucasian women was 93.2%, 74.4% for CA125 at the ACOG approved cut-off level of 200 U/ml cutoff, and 80.4% using the 2007, Dearking 67 U/ml cutoff. In AA American women, MIA sensitivity was 79.2%, 33.3% for CA125 at the ACOG approved cut-off levels and 62.5% at the 2007, Dearking 67 U/ml cutoff. Conclusion: Our results support that CA125 in AA women with adnexal masses has lower sensitivity than MIA no matter what the cutoff value is. Implementation of MIA in evaluation of adnexal masses should increase sensitivity of detection of malignancy compared with CA125, particularly in AA women.

Ethnic disparity in clinical performance between multivariate index assay and CA125 in detection of ovarian malignancy