The cell line Ishikawa was established from an endometrial adenocarcinoma from a 39 year old woman. The cells induced well differentiated adenocarcinoma in athymic nude mice. Estrogen and progesterone receptors were demonstrated both in cell culture and in induced tumours. Ishikawa has been reported to produce corticotropin-releasing hormone, placental alkaline phosphatase and chorionic gonadotrophin, and responded to steroid hormones.