Abstract
Purpose
Current low anterior resection syndrome (LARS) score is lagging behind and only based on clinical symptoms patient described. Preoperative imaging indicators which can be used to predict LARS is unknown. We proposed preoperative MRI parameters for identifying major LARS.
Methods
Patients receiving curative restorative anterior resection from Sept. 2007 to Sept. 2015 were collected to complete LARS score (median 75.7 months since surgery). MRI measurements associated with LARS were tested, and a multivariate logistic model was conducted for predicting LARS. Receiver operating characteristic curve was used to evaluate the model.
Results
Two hundred fifty-five patients undergoing neoadjuvant chemoradiotherapy and 72 patients undergoing direct surgery were enrolled. The incidence of major LARS in NCRT group was significantly higher (53.3% vs.34.7%, P = 0.005). In patients with neoadjuvant chemoradiotherapy, the thickness of ARJ (TARJ), the distance between the tumor’s lower edge and anal rectal joint (DTA), and sex were independent factors for predicting major LARS; ORs were 0.382 (95% CI, 0.198–0.740), 0.653 (95% CI, 0.565–0.756), and 0.935 (95% CI, 0.915–0.955). The AUC of the multivariable model was 0.842 (95% CI, 0.794–0.890). In patients with direct surgery, only DTA was the independent factor for predicting major LARS; OR was 0.958 (95% CI, 0.930–0.988). The AUC was 0.777 (95% CI: 0.630–0.925).
Conclusions
Baseline MRI measurements have the potential to predict major LARS in rectal cancer, which will benefit the decision-making and improve patients’ life quality.
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Xiao-Yan Zhang, Liu Xin-Zhi, Ying-Shi Sun, and Ai-Wen Wu designed the study; Xiao-Yan Zhang, Xin-Zhi Liu, Lin Wang, Hai-Bin Zhu, Rui-Jia Sun, Zhen Guan, Qiao-Yuan Lu, Wei-Hu Wang, and Zhong-Wu Li collected data; Xiao-Yan Zhang, Xin-Zhi Liu, Xiao-Ting Li, Hai-Tao Zhu, Ying-Shi Sun, and Ai-Wen Wu analyzed and interpreted the data; Xiao-Yan Zhang and Xin-Zhi Liu drafted the manuscript; all authors reviewed and approved the manuscript.
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Highlights
• Low anterior resection syndrome (LARS) score is lagging behind, while there are no recognized preoperative indicators for predicting LARS. This study identified preoperative MRI feature for predicting LARS and developed a MR-based model.
• The distance between the lower edge of the tumor and anorectal joint (DTA) was proved an independent factor for predicting major low anterior resection syndrome (LARS) in both neoadjuvant therapy group and direct surgery group. In neoadjuvant therapy group, the thickness of the anal rectal joint (TARJ) was also an independent factor for predicting major LARS.
• Multivariate models were constructed for predicting major LARS; AUC were 0.842 and 0.777 for neoadjuvant therapy group and direct surgery group, respectively.
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Zhang, XY., Liu, XZ., Li, XT. et al. MRI measurements predict major low anterior resection syndrome in rectal cancer patients. Int J Colorectal Dis 37, 1239–1249 (2022). https://doi.org/10.1007/s00384-022-04169-9
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DOI: https://doi.org/10.1007/s00384-022-04169-9