No of 5-year relative S.E. % of lost Median
  patients survival rate     (months)
Total 4136 50.86 1.76 22.7
1-2 st.treated 1817 71.04 2.56 32.86
1-2 st.not treated 439 47.54 5.55 26.88 55.01
3 st. treated 1060 42.91 3.39 14.15 38.33
3 st.not treated 170 14.33 7.28 11.18 13
4 st.treated 115 9.05 6.39 7.83 7.95
4 st.not treated 321 0.67 1.38 4.05 3.62