Some studies indicate that up to 15% of serous ovarian cancers are thought to be actually primary peritoneal carcinomas in origin.

The median survival of primary peritoneal carcinomas is usually shorter by 2-6 months time when compared with serous ovarian cancer.

TSP-1 staining was positive in two of nine primary carcinomas without metastases (22%).

However, there was no difference in OPN expression between primary carcinomas with metastases and those without metastases.

No patient had primary hepatocellular carcinoma.

Increased levels of miR-10a have been found in glioblastoma, anaplastic astrocytomas, primary hepatocellular carcinomas and colon cancer.

Necrotizing tumors: 8% to 18% are due to neoplasms across all age groups, higher in older people; primary squamous carcinoma of the lung is the most common.

After a prophylactic oophorectomy, a small percentage of women may develop a primary peritoneal carcinoma, similar in appearance to ovarian cancer.

This condition causes severe liver damage and, in very rare cases, may also lead to primary hepatocellular carcinoma.

There is an association with endometriosis and concurrent primary endometrial carcinoma (endometrial cancer).