Figure 3

Positive membrane staining of HLA-DR in undifferentiated carcinoma, 400 × (A); negative staining of HLA-DR in carcinoma cellsand dispersed lymphocytes with HLA-DR expression, 400 × (B).
Positive membrane staining of HLA-DR in undifferentiated carcinoma, 400 × (A); negative staining of HLA-DR in carcinoma cellsand dispersed lymphocytes with HLA-DR expression, 400 × (B).