Abstract
Objectives
To evaluate the baseline MRI characteristics for predicting survival outcomes and construct survival models for risk stratification to facilitate personalized treatment and follow-up strategies in patients with MRI-defined T3 (mrT3) locally advanced rectal cancer (LARC).
Methods
We retrospectively reviewed 256 mrT3 LARC patients evaluated between 2008 and 2012 in our institution, with an average follow-up period of 6.8 ± 1.2 years. The baseline MRI characteristics, clinical data, and follow-up information were evaluated. The patients were randomized into a training cohort (TC, 186 patients) and validation cohort (VC, 70 patients). The TC dataset was used to develop multivariate nomograms for disease-free survival (DFS) and overall survival (OS), while the VC dataset was used for independent validation of the models. Harrell concordance (C) indices and Hosmer-Lemeshow calibration were used to evaluate the performances of the models.
Results
Baseline mrT3 substage, extramural venous invasion (EMVI) grading, mucinous adenocarcinoma, mesorectal fascia involvement, elevated pretreatment carcinoembryonic antigen level, and neoadjuvant chemoradiotherapy (NCRT) were independent predictors of DFS. T3 substage, EMVI grading, and NCRT were also independent predictors of OS. The nomograms constructed permitted the individualized prediction of 3-year and 5-year DFS and 5-year OS with high discrimination (C-index range, 0.833–0.892) and good calibration in the TC and VC.
Conclusions
We have identified baseline MRI characteristics that help independently predict survival outcomes in patients with mrT3 LARC. The survival models based on these characteristics allow for the individualized pretreatment risk stratification in patients with mrT3 LARC.
Key Points
• Baseline MRI characteristics can independently stratify risk and predict survival outcomes in patients with mrT3 LARC.
• The nomograms built using selected baseline MRI characteristics facilitate the individualized pretreatment risk stratification and help with clinical decision-making in patients with mrT3 LARC.
• MR-defined risk factors should, therefore, be carefully reported in the baseline MRI evaluation.





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Abbreviations
- CEA:
-
Carcinoembryonic antigen
- DFS:
-
Disease-free survival
- EMD:
-
Extramural depth
- EMVI:
-
Extramural venous invasion
- LARC:
-
Locally advanced rectal cancer
- LNM:
-
Lymph node metastasis
- MAC:
-
Mucinous adenocarcinoma
- MRF:
-
Mesorectal fascia
- MRI:
-
Magnetic resonance imaging
- OS:
-
Overall survival
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Acknowledgements
We appreciate Shangying Hu for her statistical advice for this manuscript.
Funding
This study has received funding from the National Nature Science Foundation of China (Grant 81971589); the Peking Union Medical College Youth Fund, the Fundamental Research Funds for the Central Universities (No. 3332018078); and the Beijing Hope Run Special Fund of the Cancer Foundation of China (No. LC2017B18).
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The scientific guarantor of this publication is Hongmei Zhang.
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The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
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Shangying Hu kindly provided statistical advice for this manuscript.
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Only if the study is on human subjects: Written informed consent was waived by the Institutional Review Board.
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• performed at one institution
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Zhao, Q., Wan, L., Zou, S. et al. Prognostic risk factors and survival models for T3 locally advanced rectal cancer: what can we learn from the baseline MRI?. Eur Radiol 31, 4739–4750 (2021). https://doi.org/10.1007/s00330-021-08045-y
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DOI: https://doi.org/10.1007/s00330-021-08045-y