Abstract
Objectives
Describe the cumulative incidence (CUIN) of peritoneal carcinomatosis (PC) and survival in patients presenting with advanced rectal cancer at staging pelvic MRI.
Methods
From 2013 to 2018, clinicopathologic records of patients with pretreatment rectal MRI clinical (c)T3c, cT3d, cT4a, and cT4b primary rectal adenocarcinoma were retrospectively reviewed by two radiologists. Standard MRI descriptors and pathologic stages were recorded. Recurrence-free (RFS) and overall survival (OS) were estimated using the Kaplan–Meier method. Development of PC was explored using competing risk analysis. Differences in survival were compared using the log-rank test. Gray’s test was used to test for differences in CUIN of PC.
Results
Three hundred forty-three patients (147 women; median age, 56 years) had MRI stages cT3cd, n = 170; cT4a, n = 40; and cT4b, n = 133. Median follow-up among survivors was 27 months (0.36–70 months). For M1 patients, OS differed only by cT stage (2-year OS: cT3 88.1%, cT4a 79.1%, cT4b 64.7%, p = 0.045). For M0 patients, OS and RFS differed only by pathological (p)T stage. We observed a statistically significant difference in the cumulative incidence of PC by cT stage (2-year CUIN: cT3 3.2%, cT4a 8.5%, cT4b 1.6%, p = 0.01), but not by pT stage. Seventy-nine patients (23%) presented with metastatic disease (M1), eight with PC (2.3%). Overall, eight patients presented with PC (cT4a: n = 4, other stages: n = 4) and 22 developed PC (cT4a: n = 5, other stages: n = 17).
Conclusions
PC is uncommon in rectal cancer. MRI–based T stage exhibited an overall association with the cumulative incidence of PC, and descriptively, cT4a stage appears to have the highest CUIN.
Key Points
• In a retrospective study of 343 patients with rectal cancer undergoing baseline MRI and clinical follow-up, we found that peritoneal carcinomatosis was rare.
• We observed a significant overall association between PC at presentation and cT stage that appeared to be driven by the higher proportion of cT4a patients presenting with PC.
• Among patients that did not present with PC, we observed a significant overall association between time to PC and cT stage that may be driven by the higher cumulative incidence of PC in cT4a patients.
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Abbreviations
- MRI:
-
Magnetic resonance imaging
- NR:
-
Not reached
- OS:
-
Overall survival
- PC:
-
Peritoneal carcinomatosis
- RFS:
-
Recurrence-free survival
- TME:
-
Total mesorectal excision
- VP:
-
Visceral peritoneum
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Acknowledgements
The authors thank Joanne Chin, MFA, ELS, for her editorial assistance on this paper.
Funding
This study has received funding by the National Cancer Institute Cancer Center Core Grant P30 CA008748.
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The scientific guarantor of this publication is Marc J. Gollub, MD.
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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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Two of the authors have significant statistical expertise (Stephanie Lobaugh, Marinela Capanu).
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Gollub, M.J., Lobaugh, S., Golia Pernicka, J.S. et al. Occurrence of peritoneal carcinomatosis in patients with rectal cancer undergoing staging pelvic MRI: clinical observations. Eur Radiol 32, 5097–5105 (2022). https://doi.org/10.1007/s00330-022-08694-7
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DOI: https://doi.org/10.1007/s00330-022-08694-7