Have you been diagnosed with a brain tumour? Order your free information pack.


Relating to clinical trials, where the patients and/or the researchers do not know which patients are receiving the active treatment/medication and which are not. Trials can be single blind, where the patients do not know, but the researchers do; or double-blind, where neither the patients not the researchers know. These techniques help to avoid bias in the results, such as caused by the placebo effect.