Immunohistochemistry ck7 (+) suggests possible tumors of epithelial origin, such as ovarian, lung and breast cancers. ck7 is an indicator of immunohistochemical pathology findings and is mostly used as a marker for some tumors of epithelial origin nature, where ck is an abbreviated form of cytokeratin. ck7 is mostly expressed in breast and lung epithelial cells as well as in ovarian tissue. Therefore, when ck7 (+) is present, it mainly suggests the presence of possible ovarian, lung or breast cancer or a positive tumor tissue biopsy. Therefore, when the immunohistochemistry results show ck7(+), it should be taken seriously, and the patient should go to the hospital in time and receive appropriate treatment.