Blood tests are generally non-specific and may include mild abnormalities of liver chemistry, hyperglycemia and anemia, with the exception of some tumor markers such as carbohydrate antigen 19-9 (CA 19-9) and carcino-embryonic antigen (CEA), useful more in diagnosing cancer recurrence than to screen patients [8]. This evidence concerns the gene CEACAM5 and anemia (phenotype).