DPP4 and hereditary clear cell renal cell carcinoma: Protein Atlas of immunohistochemistry data by antibody staining of various normal as well as cancerous human cells showed that several prostate cancers and a few renal cell carcinomas displayed moderate to strong membranous or cytoplasmic positivity to antibody to CD26/DPP4, while most other cancers including pancreatic and breast did not (14).