Pre-op MRI of margins predicts rectal cancer outcomes
Fiona G.M. Taylor, from Mayday University Hospital in Croydon, U.K., and colleagues conducted a follow-up study in 374 patients with rectal cancer. Preoperative high-resolution pelvic MRIs were used to assess CRM, and the relationship of MRI assessment and outcomes were evaluated.
The researchers found that five-year overall survival (OS) was 62.2 percent in patients with MRI-clear CRM compared to 42.2 percent in patients with MRI-involved CRM (hazard ratio, 1.97). Disease-free survival (DFS) at five years was 67.2 percent for MRI-clear CRM versus 47.3 percent for MRI-involved CRM (hazard ratio, 1.65). For MRI-involved CRM, local recurrence (LR) was 3.50. In multivariate analysis, MRI-involved CRM was the only preoperative staging parameter that remained significant for OS, DFS, and LR.
"High-resolution MRI preoperative assessment of CRM status is superior to American Joint Committee on Cancer TNM-based criteria for assessing risk of LR, DFS, and OS," the authors write.
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