Blood tests, including tumour markers such as carcinoembryonic antigen (CEA), a-fetoprotein (AFP), carbohydrate antigen 19-9 (CA 19-9), and carbohydrate antigen 125 (CA 125), were within normal limits apart from microcytic anemia (hemoglobin: 8.0 gr/dl). The gene discussed is CEACAM5; the disease is anemia (phenotype).