CK7+ is indicative of a positive immunohistochemistry CK7 result, suggesting that you may have adenocarcinoma of the ovaries, breast, lungs, etc. Immunohistochemistry is a qualitative, quantitative, and localized test for antigens within the body’s histology using the basic principles of immunology, which is the binding of antigens and antibodies. CK7 is one of the indicators, a keratin protein present in the glandular epithelium of most normal tissues, and if it is positive, then it is not excluded that one may have a plasma cancer of the ovary, endometrial cancer, or adenocarcinoma of the breast, among other diseases. Therefore, if CK7+ is detected, it is necessary to further combine it with tumor marker tests to determine the primary location and extent of the cancer.