CEACAM5 and neoplasm: Tumor markers exhibited notable variations: carcinoembryonic antigen (CEA) levels were 146.14±243.13 ng/mL (Level 0), 72.62±149.56 ng/mL (Level 1), 15.16±27.59 ng/mL (Level 2), and 31.21±81.01 ng/mL (Level 3), with Level 0 showing significantly higher levels than Level 2 (p<0.001) and Level 3 (p=0.010).