Diagnostic Utility of Culdocentesis in Patients With a Suspicious Adnexal Mass

This is a single cohort, exploratory pilot study of 60 participants to assess if ovarian cancer markers, cancer antigen-125 (CA-125) and human epididymis protein 4 (HE4), are measurable from cul-de-sac washings collected via culdocentesis. Immediately prior to the scheduled surgery, while the patient is under general anesthesia, a long, thin needle will be inserted through the wall of the vagina (just below the uterus) to access the cul-de-sac. A saline wash will then be performed and this fluid will be collected for analysis of tumor markers. CA-125 and HE4 levels will be compared to serum levels for correlation with a diagnosis of ovarian cancer. A urine sample will also be collected from this same cohort to measure estrogen metabolites. Estrogen metabolism is associated with cancer progression in estrogen sensitive tissues. Estrogen metabolites, 2-hydroxyestrone (2-OHE1) the "good" byproduct and 16α-hydroxyestrone (16α-OHE1) known as the "bad" byproduct, have been implicated in the development of breast cancer. Study investigators are proposing to expand the utility of this predictive ratio to ovarian cancer by measuring the potential imbalance of these metabolites.

If results indicate an association between cancer diagnosis and levels of CA-125 and HE4 or the ratio of estrogen metabolites from the urine, this could allow for a new minimally invasive, low-risk diagnostic modality for all suspected ovarian cancer cases. This would be particularly invaluable for patients at higher risk for poor surgical outcomes. Data from this pilot study will confirm the potential effect size needed to identify an optimal cut-point useful for the prediction of EOC within this study population.