Endostatin therapy reveals a U-shaped curve for antitumor activity. - Tjin Tham Sjin, R. M.; Naspinski, J.; Birsner, A. E.; Li, C.; Chan, R.; Lo, K-M; Gillies, S.; Zurakowski, D.; Folkman, J.; Samulski, J.; Javaherian, K. (Cancer Gene Therapy, 2006)