Table 1

 Cytokeratin (CK) expression in the three groups of patients

Group
ABC
The numbers in parenthesis denote the percentage.
*Number of patients in whom staining was uncertain.
Number of patients284747
CK7
    +25 (89)41 (87)43 (91)
    −154
Insufficient material*21
    Diffuse23 (92)34 (83)41 (95)
    Focal2 (8)7 (17)2 (5)
CK20
    +19 (68)29 (62)34 (72)
    −71713
Insufficient material*21
    Diffuse9 (47)11 (38)11 (32)
    Focal10 (53)18 (62)23 (68)