Background: To perform chemoradiotherapy (CRT) effectively, it is clinically beneficial to identify predictors of tumor response after CRT. This study examined the association between plasma fibrinogen level before preoperative CRT and tumor response in advanced rectal cancer.
Methods: This was a retrospective study of 947 patients who received preoperative CRT followed by curative surgery for primary rectal cancer. We analyzed clinical factors that could be associated with pathologic tumor response in terms of downstaging (ypStage 0-I), primary tumor regression (ypT0-1), and complete response (ypT0N0).
Results: Downstaging was observed in 366 patients (38.6%), primary tumor regression in 187 patients (19.7%) and complete response in 138 patients (14.6%). Multivariate analysis found that pre-CRT carcinoembryonic antigen (CEA) level, fibrinogen level, hemoglobin level, clinical T and N classification, distance from anal verge, and histologic grade were significant predictive factors for downstaging; CEA level, fibrinogen level, and N classification predicted primary tumor regression; CEA level, and fibrinogen level were predictive for complete response.
Conclusions: This study demonstrated that fibrinogen level was a significant predictor of pathologic tumor response after preoperative CRT.
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