The tumour microenvironment has an important role in tumorigenesis. Here, the genetic inactivation of Pten in stromal fibroblasts of mouse mammary glands is shown to accelerate the initiation, progression and malignant transformation of mammary epithelial tumours. The data presented suggest that the Pten–Ets2 axis — Ets2 being a transcription factor activated by the loss of Pten — is a critical stroma-specific signalling pathway that suppresses mammary epithelial tumours.
- Anthony J. Trimboli
- Carmen Z. Cantemir-Stone
- Gustavo Leone
