CEACAM5 and neoplasm: The utility of determining CEACAM5 mRNA levels to detect disseminated tumor cells is underscored by the fact that all H&E(+) LNs (21/185) in the side-by-side analysis of LN sections by histopathology and qRT-PCR had high CEACAM5 mRNA levels, and several H&E(–) LNs (7/164) had CEACAM5 levels within the same range.