No of 5-year relative S.E. % of lost Median
  patients survival rate     (months)
Total 14442 12.79 0.66 7.6 5.45
1-2 st.treated 1117 44.74 3.64 22.83 50.78
1-2 st.not treated 909 26.29 3.87 17.49 12.51
3 st. treated 2286 24.66 2.08 10.5 15.77
3 st.not treated 2474 11.39 1.7 8.81 6.94
4 st.treated 1479 3.81 1.26 4.26 5.22
4 st.not treated 5107 2.39 0.54 2.31 2.33