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Table 1 Description of the three samples used to develop (n =1067) and validate the model (n =3168 and n =31,075)

From: Validation of death prediction after breast cancer relapses using joint models

  French cohort West Midlands Netherlands
  (1989-1993) (1996) (2003-2006)
Variable N=1067 % N=1196 % N=31075 %
Age       
Age ≤40 82 7.7 73 6.1 2126 6.8
Age [40-55] 391 36.6 456 38.1 10681 34.4
Age >55 594 55.7 667 55.8 18268 58.8
Peritumoural vascular involvement 285 26.7 460 38.5 - -
Tumour size > 20 mm 242 22.7 560 46.8 12365 39.8
Nodal involvement 451 42.3 496 41.5 12588 40.5
Grade       
Grade I 316 29.6 226 18.9 6565 21.1
Grade II 488 45.7 526 44.0 13993 45.0
Grade III 263 24.6 444 37.1 10517 33.8
Number of recurrent events
None 705   895   27231  
1 301   240   3834  
2 57   49   10  
3 4   10   0  
4 0   2   0  
5-year survival 89.1 (87.3-91.0) 76.6 (74.2-79.0) 85.5 (85.1-85.9)
10-year survival 77.1 (74.6-79.7) 63.1 (60.5-65.9) -  
15-year survival 65.4 (62.2-68.2) 51.6 (48.8-54.5) -