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Immunohistochemical staining showed that all the lesions expressed PCK, CK5/6, P63, and P53, but was Ber-EP4-negative. The plaque on the scalp and the mass on the neck also showed CAM5.2, CK7, CEA, and EMA were negative, and S-100 was negative in the nodule of the scalp and the mass of the neck. CD34 was only expressed in nodules on the scalp and was negative in plaques on the scalp and masses on the neck.
