"Certain non-malignant conditions are also associated with its elevation e.g. first trimester pregnancy, endometriosis, ovarian cysts, benign breast disease, kidney disease, and liver disease."
"CA 27-29 is a tumour marker and is a soluble form of glycoprotein MUC1. It may be elevated in patients with breast cancer. Tumours of the colon, stomach, kidney, lung, ovary, pancreas, uterus, and liver may also raise CA 27-29 levels."