This study collects information to maintain a database on patients with low-grade ovarian or peritoneal tumors. Collecting information about the type of cancer and treatment, as well as details about follow-up care, may help researchers learn and better understand these tumor types and help develop better treatments for them.
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Inclusion Criteria: * Patients whose disease progressed to a higher-grade carcinoma since the time of original diagnosis: * Ovarian tumor of low malignant potential * Low-grade serous carcinoma of the ovary * Primary peritoneal tumor of low malignant potential * Low-grade serous carcinoma of the peritoneum * Psammocarcinoma