CEACAM5 and neoplasm: The serum tumor markers were as follows: carcinoembryonic antigen (CEA) = 8.4 ng/mL (normal range, <5.0 ng/mL), cytokeratin fragment (CYFRA) = 5.8 ng/mL (normal range, <2.0 ng/mL), and interleukin-2 (IL-2) receptor = 445.0 U/mL (normal range, <496.0 U/mL).