Figure 1: (a) Squamous cell carcinoma depicting cytoplasmic staining (negative membrane staining; Her2/neu, ×400); (b) Squamous cell carcinoma, membrane staining (Her2/neu, ×400); (c) Squamous cell carcinoma depicting membrane and cytoplasmic staining (Her2/neu, ×100); (d) Dysplastic epithelium depicting staining in the prickle cell layer in a case of positive membrane staining (Her2/neu, ×100)