highly significantP < 0.05
However, death due to cancer causes had also highly significant SMR in elderly cancer patients within 10+ years of follow-up (O/E = 7.23, P < 0.05, 95% CI: 7.22-7.24) especially within the first year after diagnosis (O/E = 27.02, P < 0.05, 95% CI: 26.96-27.08).