Fig. 1From: CEA clearance pattern as a predictor of tumor response to neoadjuvant treatment in rectal cancer: a post-hoc analysis of FOWARC trialAn exponential trend line (blue line) was drawn using each CEA value (baseline, 2nd, 4th, 6th, 8th, and 14th week from the start of preoperative treatment). The function of the exponential curve (yellow line) was drawn. R2 values were calculated as the deviation between the calculated curves and the measured CEA valueBack to article page