Saturday, August 19, 2006

Clinical Trials: Phase 1, 2 , 3 and 4 ---(2)


About 7 out of every 10 (70%) new treatments tested at phase 1 make it to phase 2 trials. These trials may be done on people who all have same sub-type of the disease, or with several different sub-types of the disease. Phase 2 trials are done to find out

* If the new treatment works well enough to test in phase 3
* Which sub-types of the disease it is effective against
* More about side effects and how to manage them
* More about the most effective dose to use

Although these treatments have been tested at phase 1, you may still have side effects that are not known about. Drugs can affect people in different ways.

Phase 2 trials are often larger than phase 1. There may be up to 50 people taking part. If the results of phase 2 trials show that a new treatment may be as good as existing treatment, or better, it then moves to phase 3.

Source: Cancer Research UK

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