" In one embodiment of the invention, said compound of formula I or a pharmaceutically acceptable salt thereof is administered separately, simultaneously, concurrently, sequentially or chronologically staggered with an anti-cancer effective amount of radiation. It will be clear from the foregoing that as used herein the term "effective amount" includes an amount of an active compound that is effective when administered by itself as well as an amount of an active compound that is effective when administered in conjunction with another therapeutic agent."