MUC16 and endometriosis: Combined with CA125 and patient clinical data, BDNF was incorporated into a multivariate diagnostic model, which achieved a sensitivity of 46.2% (95% CI: 25.5–66.8%) and a very high specificity of 100% (95% CI: 86.7–100%) in the validation study, making it a useful “rule-in” test to help confirm the suspicion of endometriosis.