耳下腺原発epithelial-myoepithelial carcinoma—再発時の増殖形態

Epithelial-Myoepithelial Carcinoma of the Parotid Gland:Proliferation Character of Epithelial Cells at its Recurrence

　はじめに

上皮筋上皮癌は発生頻度の少ない腫瘍であるが，近年その症例報告も散見されるようになった^1,2）。しかし，その再発増殖形態や放射線治療の有効性については，まだ不明な点がある。今回，耳下腺原発EMC （epithelial-myoepithelial car-cinoma）再発例を経験し，知見を得たので報告する。

In a case of recurrent epithelial-myoepithelial carcinoma (EMC) of the parotid gland after surgery and radiation therapy, the intensity of positive staining with an anti-PCNA (proliferating cell nuclear antigen) antibody was increased in epithe-lial cells, which is suggesting proliferating roles in growth of EMC for these cells as well as myoepithe-lial cells, especially at recurrence of EMC.