No of 5-year relative S.E. % of lost Median
  patients survival rate     (months)
Total 6015 23.25 1.3 12.4 16.52
1-2 st.treated 1184 49.6 3.63 24.16 59.57
1-2 st.not treated 680 23.9 4.24 15.29 21.41
3 st. treated 1531 31.18 2.82 13.78 27.84
3 st.not treated 614 11.81 3.49 10.59 13.26
4 st.treated 534 5.86 2.55 5.43 7.93
4 st.not treated 1081 2.64 1.28 3.24 3.19