Use

Cytokeratin 7 (CK7) antibody reacts with proteins found in most ductal, glandular, and transitional epithelium of the urinary tract and bile duct epithelial cells. CK7 helps distinguish lung and breast epithelium (which stain positive) from colon and prostate epithelial cells (which are negative). It also reacts with many benign and malignant epithelial lesions, such as adenocarcinomas of the ovary, breast, and lung. Transitional cell carcinomas are positive and most prostate cancers are negative.