patient number
x1: age (years)
x2: sex
x3a: 0 = WHO 0, 1 = WHO 1 or 2
x3b: 0 = WHO 0 or 1, 1 = WHO 2
x4: days from original diagnosis to treatment for advanced disease
x5: days from metastasis to treatment for advanced disease
x6: kidney removed (Y/N)
x7: metastatic sites
x8: haemoglobin (g/dl)
x9: white cell count (per l x 10^-9)
x10: treatment
WHO performance status (0/1/2)
t: time to death (days)
d: censoring (0 = censored, 1 = died)
1 if haem imputed, 0 otherwise
1 if wcc imputed, 0 otherwise
1 if mets imputed, 0 otherwise
1 if t_mt imputed, 0 otherwise