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Background The proportion of elderly colorectal cancer (CRC) patients requiring surgery is increasing. Colorectal resection for left-sided cancers is the most controversial as the primary anastomosis or end-colostomy and open or minimally invasive approaches are available. Therefore, this study was conducted to investigate the short- and long-term outcomes in elderly patients after resection with primary anastomosis for left-sided CRC. Methods The cohort study included left-sided colorectal cancer patients who underwent resection with primary anastomosis. The participants were divided into non-elderly (≤75 years) and elderly (&gt; 75 years) groups. Short- and long-term postoperative outcomes were investigated. Results In total 738 (82%) and 162 (18%) patients were allocated to non-elderly and elderly groups, respectively. Minimally invasive surgery (MIS) was less prevalent in the elderly (42.6% vs 52.7%,  p  = 0.024) and a higher proportion of these suffered severe or lethal complications (15.4% vs 9.8%,  p  = 0.040). MIS decreased the odds for postoperative complications (OR: 0.41; 95% CI: 0.19–0.89,  p  = 0.038). The rate of anastomotic leakage was similar (8.5% vs 11.7%,  p  = 0.201), although, in the case of leakage 21.1% of elderly patients died within 90-days after surgery. Overall- and disease-free survival was impaired in the elderly. MIS increased the odds for long-term survival. Conclusions Elderly patients suffer more severe complications after resection with primary anastomosis for left-sided CRC. The risk of anastomotic leakage in the elderly and non-elderly is similar, although, leakages in the elderly seem to be associated with a higher 90-day mortality rate. Minimally invasive surgery is associated with decreased morbidity in the elderly.

Short and long-term outcomes of elderly patients undergoing left-sided colorectal resection with primary anastomosis for cancer