Consistent differences in immunoreactivity between tumor and control cells were found in half of gene products: claudin-1, cystatin A, CD44, calgranulin A (S100A8), prostaglandin-endoperoxide synthase 1 (COX-1), junctional adhesion molecule 3 (JAM3), envoplakin, and c-myc. Here, PTGS1 is linked to neoplasm.