Abstract
Purpose
Rectal cancer patients who present with peritumoral abscesses and fistulas at the time of diagnosis may be denied chemoradiotherapy (CRT) as the safety is unknown. The aim of this study was to investigate the safety of preoperative CRT in this patient group.
Methods
We performed a retrospective nested case–control study to compare outcomes between patients with locally advanced rectal cancer with peritumoral abscesses and fistulas (study group) and patients with T4 locally advanced rectal cancer with no evidence of abscesses and fistulas (control group). These groups were matched by treatment center and radiotherapy delivery method. All patients received 50–54 Gy of conventionally fractionated RT with concurrent chemotherapy. Primary endpoint was grade 3–5 toxicity (by National Cancer Institute Common Toxicity Criteria for Adverse Events (NCI CTCAE). Secondary endpoints included postoperative morbidity, pathologic complete response (pCR), disease-free survival (DFS), and overall survival (OS) at 2 years.
Results
A total of 33 patients were included in each group. Grade 3 toxicity was observed in 2 (6.1%) patients in the study group and 4 (12.1%) patients in the control group (p = 0.672). No patients developed grade 4–5 toxicity. Grade 3–4 Clavien–Dindo complications were observed in 5 (15.2%) patients in the study group and in 6 (18.2%) patients in the control group (p = 1.0). Pathologic CR was achieved in 3 (9.1%) and 5 (15.2%) patients, respectively (p = 0.708). Two-year OS was 78.3% vs. 81.8% (p = 0.944), 2‑year DFS was 62.8% vs. 69.7% (p = 0.693), respectively.
Conclusion
The presence of peritumoral abscesses and fistulas in patients with locally advanced rectal cancer is not associated with increased toxicity or inferior clinical outcomes after preoperative CRT.
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This work was supported by the N.N. Blokhin Russian Cancer Research Center
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All authors contributed to the conception of the work, analysis, and data interpretation. All authors have revised the manuscript critically and approved the version to be published.
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S. Gordeyev, V. Ivanov, M. Fedianin, M. Chernikh, N. Kozlov, L. Petrov, D. Erygin, I. Gridasov, V. Kaushanskiy, D. Feoktistov, and Z. Mamedli declare that they have no competing interests.
Ethical standards
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Ethical approval was waived by the local Ethics Committee of N.N. Blokhin Russian Cancer Research Center in view of the retrospective nature of the study and all the procedures being performed were part of the routine care. Consent to participate: Written informed consent was obtained from all patients. Consent for publication: No personal data or images are presented in this article.
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The datasets generated during the current study are available from the corresponding author on reasonable request. The dataset is available at the repository of the Russian Colorectal Cancer Society (db.oncoproct.ru).
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Gordeyev, S., Ivanov, V., Fedianin, M. et al. Neoadjuvant chemoradiotherapy for locally advanced rectal cancer with peritumoral abscesses and fistulas. Strahlenther Onkol 198, 201–208 (2022). https://doi.org/10.1007/s00066-021-01878-y
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DOI: https://doi.org/10.1007/s00066-021-01878-y