What does CK7 tumor mean?

CK7, or cytokeratin 7, is a protein that is part of the cytoskeletal structure in epithelial cells. Tumors that express CK7 are typically associated with certain types of cancers, such as those originating in the lung, ovary, and breast. The presence of CK7 can help pathologists in diagnosing specific tumors and determining their origin, as different cancers have distinct patterns of cytokeratin expression.