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Table 2 Proportion of grades among diff erent studies.

From: Breast cancer prognostic classification in the molecular era: the role of histological grade

Study Number of cases Grade 1 Grade 2 Grade 3
Elston, 1984 [77] 625 17% 37% 46%
Davis et al., 1986 [78] 1,537 22% 49% 29%
Hopton et al., 1989 [59] 874 29% 46% 25%
Le Doussal et al., 1989 [79] 1,262 11% 45% 46%
Balslev et al., 1994 [80] 9,149 32% 49% 19%
Saimura et al., 1999 [5] 741 19% 37% 44%
Reed et al., 2000 [32] 613 25% 41% 35%
Simpson et al., 2000 [7] 368 22% 45% 33%
Lundin et al., 2001 [6] 1,554 26% 47% 27%
Frkovic-Grazio and Bracko, 2002 [9] 270 38% 38% 24%
Warwick et al., 2004 [10] 1,988 23% 37% 40%
Williams et al., 2006 [26] 1,058 20% 46% 34%
Rakha et al., 2008 [11] 2,219 18% 36% 46%
Thomas et al., 2009 [81] 1,650 26% 45% 29%
Blamey et al., 2009 [12] 16,944 29% 41% 30%