University of Glasgow Academic Unit of Surgery, Glasgow, United Kingdom
Katrina Knight , Paul G. Horgan , Donald C. McMillan , James Hugh Park , Campbell SD Roxburgh
Background: Both tumour location and systemic inflammation (SI) have been related to survival in patients undergoing curative surgery for colon cancer. Recently, right colon cancer (RCC) has been associated with pre-existing cardiovascular disease (CVD). Comorbidity scores such as the Lee Cardiac Risk Index (LCRI) capture symptomatic disease only. Imaging-based assessment of vascular calcification can be used to identify subclinical CVD. We explored the relationship between tumour location, systemic inflammation, cardiac comorbidity and survival in patients undergoing CC resection. Methods: Patients were identified from a prospective cancer database. Clinicopathological characteristics and survival data were abstracted. Aortic calcification (AC) was quantified visually on staging CT images. SI was measured using the modified Glasgow Prognostic Score (mGPS). Results: Of 418 patients, most were female (221, 53%), over 65 (282, 67%), ASA grade II or less (66%) with RCC (230, 55%) and TNM II-III disease (320, 77%). Compared with LCC, RCC was associated with increasing age (59% vs 41%, p = 0.039), greater AC (61% vs 39%, p = 0.013) but not SI (61% vs 39%, p = 0.139). There were no significant differences between LCC with respect to ASA, smoking status or LCRI. Univariate analysis revealed TNM stage (HR 3.55 (95%CI 1.51 - 8.39) p = 0.004) and degree of AC (HR 1.77 (1.04 - 3.00) p = 0.034) were associated with cancer-specific survival (CSS) in RCC while in LCC, only TNM stage was related to CSS (HR 2.30 (0.99 - 5.30) p = 0.05). Multivariate analysis in patients with RCC confirmed AC to be a stage-independent predictor of CSS (HR 1.94 (1.15 – 3.67) p = 0.013). Conclusions: AC is associated with RCC and confers an inferior prognosis, independent of stage. Investigation of underlying mechanisms is required, but impaired perfusion may limit mucosal function, potentiating the effect of carcinogens in the right colon.
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