CEACAM5 and neoplasm: Laboratory examinations revealed normal blood routine (white blood cell: 5.59 × 109/L, Neutrocyte %: 71.7%, Eosinophil %: 1.8%), slightly elevated erythrocyte sedimentation rate (ESR, 40 mm/h), normal tumor markers like carcinoembryonic antigen (CEA), neuron-specific enolase (NSE), cytokeratin 211 (CY211), and normal stool routine without parasitic eggs.