Abstract
Introduction
Currently, neoadjuvant fluoropyrimidine-based chemoradiation followed by surgery is considered the standard of care for locally advanced rectal cancer. The current study aimed to investigate the predictive significance of mucinous histology on the pathologic complete response rate following neoadjuvant chemoradiation in locally advanced rectal cancer and to propose potential new treatment protocol for this specific histology.
Material and Method
This retrospective study was conducted on 403 patients with locally advanced (clinically T3–4 and/or N1–2) rectal adenocarcinoma who had been treated at three tertiary academic hospitals between 2010 and 2015. Among those 403 patients, 46 (11%) had mucinous rectal cancer (MRC) and 358 (89%) had non-mucinous rectal cancer (NMRC). All patients underwent neoadjuvant chemoradiation with capecitabine followed by low anterior or abdominoperineal resection.
Results
There were 268 men and 135 women with a median age of 55 years (range, 26–82 years). Patients with MRC were younger (p = 0.002) and presented with a larger tumor size (p < 0.001) and a more advanced tumor stage (p = 0.033) compared to the ones with MNRC. In the univariate analysis, female gender (p = 0.009), distal tumor location (p = 0.035), higher tumor stage (p = 0.049), node positivity (p = 0.001), MRC histology (p = 0.017), and high pretreatment CEA level (p = 0.013) were observed to be predictive of a poor pathologic complete response. However, in the multivariate analysis, tumor stage was the single most predictive factor of response to neoadjuvant chemoradiation.
Conclusion
Mucinous adenocarcinoma is a significant predictive factor for poor pathologic complete response to neoadjuvant capecitabine-based chemoradiation in patients with locally advanced rectal cancer. New treatment modality based on biomarkers may be considered in future prospective studies because of MRC poor prognosis. Immunotherapy combined with chemotherapy and/or radiotherapy may be an attractive option because of the tumor microsatellite instability-high status.
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The authors would like to thank Dayleen De Riggs for the editing of this manuscript.
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This retrospective study was conducted at the radiation oncology departments of three tertiary academic Iranian hospitals following approval by their respective institutional review boards (IRB) in accordance with Helsinki’s code of ethics guidelines.
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The authors declare that they have no conflict of interest.
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Hosseini, S., Nguyen, N., Mohammadianpanah, M. et al. Predictive Significance of Mucinous Histology on Pathologic Complete Response Rate Following Capecitabine-Based Neoadjuvant Chemoradiation in Rectal Cancer: a Comparative Study. J Gastrointest Canc 50, 716–722 (2019). https://doi.org/10.1007/s12029-018-0136-x
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DOI: https://doi.org/10.1007/s12029-018-0136-x