Research from St George’s Hospital, London suggests that two active ingrredients found in cannabis (THC and CBD) may have an effect on their own against gliomas (grade 4 brain cancer) but also may improve the effectiveness of radiotherapy.
The botanical form of the active ingredients produced better results than the pure form.
Ref: http://mct.aacrjournals.org/content/early/2014/11/12/1535-7163.MCT-14-0402.abstract