[moose07]

Your thoughts got me thinking (ouch).
This was all i could find:

Link medscape
Link oralcancerfoundation
Link reuters
Link nature

Maybe the mental attitude which can help recovery, might have an initial effect in some rare cases.

[Hardraade]

Can’t ask better than that.

This one’s a bit more “exotic” and coast2coast-like:

http://cancercauseandeffect.com/tag/psychosomatic/

PubMed:

http://www.ncbi.nlm.nih.gov/pubmed/6649942