NKX2-1 and neoplasm: On immunohistochemical staining 34βE12 was frequently positive in 75% of tumour cells of the patients, CK7 was frequently positive in 57% of tumour cells of the patients, and p63 was frequently positive in tumour cells of 53% of the patients; on the other hand thyroid transcription factor-1 and CD30 were consistently negative in the tumours.