“Cancer patients using cannabis report better influence from the plant extract than from synthetic products… We followed patients with a medicinal cannabis license to evaluate the advantages and side effects of using cannabis by cancer patients…

 All cancer or anticancer treatment-related symptoms showed significant improvement.

 No significant side effects except for memory lessening in patients with prolonged cannabis use were noted.

Conclusion. The positive effects of cannabis on various cancer-related symptoms are tempered by reliance on self-reporting for many of the variables. Although studies with a control group are missing, the improvement in symptoms should push the use of cannabis in palliative treatment of oncology patients.”

http://www.ncbi.nlm.nih.gov/pubmed/23956774

Full Text: http://www.hindawi.com/journals/ecam/2013/510392/