Here's one thing I found. Good luck.

...most in vivo studies have demonstrated that cannabinoids ¾ administered either locally or systemically over a range of doses ¾ inhibit cancer (Munson et al. 1975, Kaplan 1984, Chan et al. 1996, Blazquez et al. 2003, Blazquez et al. 2004, Bilfuco et al. 2001, Bilfuco et al. 2004, Casanova et al. 2003, Duntsch et al. 2005, Grimaldi et al. 2006, Kogan at al. 2004, Massi et al. 2004, McKallip et al. 2002, Portella et al. 2003, Recht et al. 2001, Sanchez et al. 2001).

And then, the studies showing that it causes cancer are those devoid of cannabinoid receptor cells, one of the most numerous in Our nervous system.