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Figure 2: Nests of atypical squamous cells (a, hematoxylin and eosin ×100). Abundant wet keratin closely admixed with the tumor cells (b, hematoxylin and eosin ×100). Tumor cells staining positive for p63 (c, immunohistochemistry ×100), Ki 67 proliferation index 30–40% (d, immunohistochemistry ×100)

Figure 2: Nests of atypical squamous cells (a, hematoxylin and eosin ×100). Abundant wet keratin closely admixed with the tumor cells (b, hematoxylin and eosin ×100). Tumor cells staining positive for p63 (c, immunohistochemistry ×100), Ki 67 proliferation index 30–40% (d, immunohistochemistry ×100)