Here is an article about a young person who is showing improvement after the parents used cannabis oil for a brain tumor. This is probably from the work of Rick Simpson who cured his own cancer by using cannabis oil (not smoked).
Cannabis or cannabinoids have strong anti microbial activity http://pptu.lefora.com/2011/12/07/got-pot/
and there is sufficient evidence that most cancers are based on some form of a microbe be it viral, fungal, bacteria etc. So this therapy makes sense.
Intro to article:
Medical marijuana is gaining acceptance, but could it even help kids? Dr. William Courtney has seen it happen, and on Friday, told HuffPost Live host Alyona Minkovski about it. Saying he was "quite a skeptic 5 or 6 years ago", Dr. Courtney continued that "my youngest patient is 8 months old, and had a very massive centrally located inoperable brain tumor." The child's father pushed for non-traditional treatment utilizing cannabis.