MMP9 induction by vascular endothelial growth factor receptor-1 is involved in lung-specific metastasis. - Hiratsuka,S.; Nakamura,K.; Iwai,S.; Murakami,M.; Itoh,T.; Kijima,H.; Shipley,J.M.; Senior,R.M.; Shibuya,M. (Cancer Cell, 2002)