Clinical Significance of Pre- to Post-Chemoradiotherapy s-CEA Reduction Ratio in Rectal Cancer Patients Treated with Preoperative Chemoradiotherapy and Curative Resection

Purpose To evaluate the clinical significance of a reduction in serum carcinoembryonic antigen (s-CEA) concentration ratio from before to after preoperative chemoradiotherapy (CRT) in terms of recurrence and prognostic factors in rectal cancer patients.