Patients with primary ovarian cancer
* Informed consent
* Digital photography \& Checking PCI (tumor size, number, and Characteristics)
* Postoperative surveillance(tumor marker, image and physical examination)
1. Developing the best fitting PCI model to reflect recurrence-free survival and overall survival
* Selection of items
* Weighting by items and tumor characteristics
2. Analysis of prognostic impact of PCI compared to conventional staging system (FIGO stage) for ovarian cancer
