Prediction of Size of Residual Discase after Initial Surgery by Postoperative Decline of Serum CA 125 Levels in Patients with Advanced Epithelial Ovarian Cancer / 대한산부인과학회잡지

ABSTRACT

In this retrospective study, we assessed the clinical usefulness of postoperative decline of serum CA 125 level after initial surgery to predict the size of residual disease in patients with advanced epithelial ovarian cancer. Between June 1989 and December 1995, sixty-three patients with advanced epithelial ovarian cancer (FIGO stage II-IV) were evaluated, who were managed at Asan Medical Center by cytoreductive surgery followed by chemotherapy. All patients had elevated preoperative serum CA 125(>35U/ml) and had another serum CA 125 assay 7~10 days after surgery. Preoperative CA 125 levels were similar in patients with residual disease below 2 cm and in those with larger residuum. The postoperative decline of serum CA 125 was significantly higher in patients with smaller residual disease only if preoperative serum CA 125 value was over 400U/ml. By taking 70% as the cutoff of CA 125 decline for discriminating patients with residual disease above 2 cm, the specificity and positive predictive value of this parameter improved when we considered patients with increasing preoperative serum levels. Hence, in the subset of patients with preoperative serum CA 125 level over 400U/ml, 95.2% (20/21) of patients with residual disease below 2 cm showed postoperative decline of serum CA 125 level over 70%, and 91.7%(11/12) of patients with postoperative decline of serum CA 125 level below 70% had residual disease over 2 cm. In conclusion, postoperative decline of serum CA 125 level after initial surgery does not exactly reflect the size of residual disease, but shows limited clinical usefulness in subset of patients with preoperative serum CA 125 level over 400 U/ml.