COX-2 inhibitor celecoxib prevents chronic morphine-induced promotion of angiogenesis, tumour growth, metastasis and mortality, without compromising analgesia.
Farooqui M, Li Y, Rogers T, Poonawala T, Griffin RJ, Song CW, Gupta K. Br J Cancer. 2007 Dec 3; 97(11):1523-31. Epub 2007 Oct 30.