A search with [Carcinoembryonic antigen] limited to subdivisions *analysis, *diagnostic use, *blood and *standards AND ‘doubling time’, and a search with [Carcinoembryonic antigen] AND [Colorectal neoplasm] AND ‘doubling time’ or ‘rise’ was done, both limited to ‘human’ and ‘English language’. Here, CEACAM5 is linked to colorectal neoplasm.