Journal
BMC CANCER
Volume 18, Issue -, Pages -Publisher
BMC
DOI: 10.1186/s12885-018-4997-y
Keywords
Rectal cancer; Carcinoembryonic antigen; Neoadjuvant treatment; Pathologic complete response
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BackgroundThe clinical factors that accurately predict the response to preoperative treatment in rectal cancer were yet unknown. The carcinoembryonic antigen (CEA) clearance pattern during neoadjuvant treatment has been developed and the predictive value explored in rectal cancer patients with elevated CEA levels (>5ng/mL).MethodsThe training cohort was derived from the FOWARC prospective phase III trial, and 71/483 eligible patients were included. The validation cohort consisted of 75/587 consecutive rectal cancer patients from Xiangya Hospital between 2014 and 2015. The kinetic changes in serum CEA were measured at different time points during the neoadjuvant treatment. An exponential trend line was drawn using the CEA values. The patients were categorized into two groups based on the R-2 value of the trend line, which indicates the correlation coefficient between the exponential graph and measured CEA values: exponential decrease group (0.9
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