SOX10 and neoplasm: Immunohistochemically, the tumour cells were diffusely positive for CK7, S-100 (Fig. 2e), p63 (Fig. 2f), SOX10 (Fig. 2g) protein and focally positive for SMA (Fig. 2h) protein and completely negative for CK20, p40, Mammaglobin, CD117 and GCDFP15.