The laparoscopic biopsies taken from the subsequent disseminated peritoneal malignancy showed poorly differentiated adenocarcinoma consistent with primary peritoneal carcinoma (possible endometrioid type)and showing a different immunostaining pattern to the previous ovarian borderline mucinous tumour with positive expression of cytokeratin 7(CK7) and CA 125 but negative for CEA and CK 20. This evidence concerns the gene KRT7 and peritoneal carcinoma.