Japan's opposition parties plan to seek the resignation of the regional revitalization minister over his description of the curators of cultural properties as a "cancer" that must be "eradicated."

Kozo Yamamoto made the remark Sunday at a seminar in Otsu, Shiga Prefecture, arguing that Japan's cultural properties are not being presented in ways that tourists from overseas can easily understand.

"The worst cancer is the curators. We have to eradicate the lot of them," he said.