HLA-A and neoplasm: Matched analysis of the expression of HLA class I, β2m and HLA class II between the conventional component versus the dedifferentiated component showed higher HLA-A (p=0.0030), HLA-BC (p=0.014), β2m (p=0.050) and HLA class II (p=0.0076) in the dedifferentiated component versus the conventional component in the same tumor.