Medical progress marches forward because clinical research is a venture that encourages daring and risk and does not fear or punish failure. Drug discovery may be the highest risk venture in the world. By its very nature it produces far more failures than successes.
For patients around the world, the successes of medical research are saving and changing lives. There are dramatic improvements in cancer survival; HIV/AIDS is no longer a death sentence; Polio is almost eradicated. Still for all the progress there is much yet to be done in treating, managing and preventing disease.