Figure 3

SMARCB1 (INI1) immunostaining in SMARCB1/SMARCA2-deficient dedifferentiated endometrial carcinomas. (a and b) Case 1 showing FIGO (The International Federation of Gynecology and Obstetrics) grade 1 endometrioid component and undifferentiated component in (a), with a higher magnification of the undifferentiated component in (b). (c and d) Case 1 showing a complete loss of SMARCB1 nuclear staining in the undifferentiated component (with internal stromal positive control) and intact SMARCB1 nuclear staining in the differentiated endometrioid component. (e and f) Case 8 showing SMARCB1-deficient undifferentiated component.