Prediction of 5-year survival in advanced-stage ovarian cancer patients based on computed tomography peritoneal carcinomatosis index

OBJECTIVE: To evaluate whether the quantification of peritoneal metastases in advanced-stage ovarian cancer patients using the peritoneal carcinomatosis index, detected by CT (CT-PCI), correlates with the serum levels of tumor marker CA-125 and 5-year survival.

METHODS: The CT-PCI was determined in 82 patients with stage III or stage IV ovarian cancer using the Sugarbaker classification prior to cytoreductive surgery. Linear regression analysis was used to correlate CT-PCI and CA-125 levels. Correlation of presurgical CT-PCI, optimal surgical cytoreduction, and 5-year survival was established using binary logistic regression analysis. A score for prediction of 5-year survival probability was established using multivariate backwards binary logistic regression.

RESULTS: Presurgical CT-PCI correlates significantly with presurgical CA-125 serum levels (r = 0.487, P < 0.001). Multivariate binary logistic regression suggested significantly improved 5-year survival with lower CT-PCI and lower ECOG performance scores.

CONCLUSION: CT-PCI allows quantification of peritoneal disease in advanced-stage ovarian cancer patients, similar to CA-125. CT-PCI in combination with ECOG performance has the potential to help evaluate the 5-year survival probability.