In 2000 when I was 10-years-old, I participated in a clinical trial for carbogen inhalation therapy. It was given in conjunction with radiation therapy based on little evidence at the time that it enhances radio-sensitivity to glioma (tumor) cells. Unfortunately, it makes the surrounding organs and tissues more radio-sensitive too.
In 2014, research showed what really enhances radio-sensitivity of glioma cells is pre-treatment with THC combined with CBD before radiation. Cannabinoids reduce the amount of radiation needed to treat a tumor, and they also protect the surrounding healthy tissues from the harmful side effects and late effects of radiation.
I know what you’re thinking, but how could they have known back then?! Well, the first study demonstrating THC-induced apoptosis of gliomas was first published in 1998. A lot more were published after that.
Sources:
"Delta9-tetrahydrocannabinol induces apoptosis in C6 glioma cells".
FEBS Letters Vol. 436, issue 1, pp. 6-10. PMID: 9771884.
Scott KA, Dalgleish AG, Liu WM (2014). "The combination of cannabidiol and Δ9-tetrahydrocannabinol enhances the anticancer effects of radiation in an orthotopic murine glioma model". Molecular Cancer Therapy. Vol 13, issue 12, pp. 2955-67. doi: 10.1158/1535-7163.MCT-14-0402. PMID: 25398831.