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). This evidence concerns the gene DPP4 and Familial prostate cancer.