Risk factors of short-term survival in the aged in elective colon cancer surgery: a population-based study

Patients aged > 80 years represent an increasing proportion of colon cancer diagnoses. Selecting patients for elective surgery is challenging because of possibly compromised health status and functional decline. The aim of this retrospective, population-based study was to identify risk factors and health measures that predict short-term mortality after elective colon cancer surgery in the aged.

All patients > 80 years operated electively for stages I-III colon cancer from 2005 to 2016 in four Finnish hospitals were included. The prospectively collected data included comorbidities, functional status, postoperative surgical and medical outcomes as well as mortality data.

A total of 386 patients (mean 84.0 years, range 80-96, 56% female) were included. Male gender (46% vs 35%, p = 0.03), higher BMI (51% vs 37%, p = 0.02), diabetes mellitus (51% vs 37%, p = 0.02), coronary artery disease (52% vs 36%, p = 0.003) and rheumatic diseases (67% vs 39%, p = 0.03) were related to higher risk of complications. The severe complications were more common in patients with increased preoperative hospitalizations (31% vs 15%, p = 0.05) and who lived in nursing homes (30% vs 17%, p = 0.05). The 30-day and 1-year mortality rates were 6.0% and 15% for all the patients compared with 30% and 45% in patients with severe postoperative complications (p < 0.001). Severe postoperative complications were the only significant patient-related variable affecting 1-year mortality (OR 9.60, 95% CI 2.33-39.55, p = 0.002).

The ability to identify preoperatively patients at high risk of decreased survival and thus prevent severe postoperative complications could improve overall outcome of aged colon cancer patients.