Abstract
Background
For clinically low-risk stage III colorectal cancer, the decision on cycles of adjuvant chemotherapy after surgery is disputed. The present study investigates the use of additional biomarkers of ploidy and stroma-ratio(PS) to stratify patients with low-risk stage III colorectal cancer, providing a basis for individualized treatment in the future.
Methods
This study retrospectively enrolled 198 patients with clinical-low-risk stage III colorectal cancer (T1-3N1M0) and analyzed the DNA ploidy and stroma ratio of FFPE tumor tissues. The patients were divided into PS-low-risk group (Diploidy or Low-stroma) and PS-high-risk group (Non-diploid and High-stroma). For survival analyses, Kaplan–Meier and Cox regression models were used.
Results
The results showed that the 5-year DFS of the PS-high-risk group was significantly lower than that in the PS-low-risk group (78.6 vs. 91.2%, HR = 2.606 [95% CI: 1.011–6.717], P = 0.039). Besides, in the PS-low-risk group, the 5 year OS (98.2 vs. 86.7%, P = 0.022; HR = 5.762 [95% CI: 1.281–25.920]) and DFS (95.6, vs 79.9%, P = 0.019; HR = 3.7 [95% CI: 1.24–11.04]) of patients received adjuvant chemotherapy for > 3 months were significantly higher than those received adjuvant chemotherapy for < 3 months. We also found that the PS could stratify the prognosis of patients with dMMR tumors. The 5-year OS (96.3 vs 71.4%, P = 0.037) and DFS (92.6 vs 57.1%, P = 0.015) were higher in the PS-low-risk dMMR patients than those in the PS-high-risk dMMR patients.
Conclusion
In this study, we found that PS can predict the prognosis of patients with stage III low-risk CRC. Besides, it may guide the decision on postoperative adjuvant chemotherapy.
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Acknowledgements
We deeply appreciate the help from all of our colleagues in the Department of Colorectal Surgery at Sun Yat-sen University Cancer Center who were involved in performing the treatments for the current study. Meanwhile, we wish to thank the timely help given by Mao Lijun and Wang Fei in article writing and basic experiment.
Funding
This work was supported by grants from the National Natural Science Foundation of China [grant numbers: 81871971, 82073159, 81772595]; Sun Yat-sen University Clinical Research 5010 Program [grant number: 2014013].
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YL, LL, ZP and PD: contributed to the conception of the study; BX, QS, YX, WM, JY and ZH: collected data; WJ, LK, JT: and KH: contributed significantly to analysis and manuscript preparation; ZH, CZ, CZ and LZ: designed table and figure; YL and LL: performed the data analyses and wrote the manuscript; ZP and PD: helped perform the analysis with constructive discussions and contributed to critical revision; All authors reviewed the manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Institutional Research Ethics Committee of Sun Yat-sen University Cancer Center (approval number: B2019-109).
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Li, Y., Liao, L., Kong, L. et al. DNA ploidy and stroma predicted the risk of recurrence in low-risk stage III colorectal cancer. Clin Transl Oncol 25, 218–225 (2023). https://doi.org/10.1007/s12094-022-02930-8
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DOI: https://doi.org/10.1007/s12094-022-02930-8