Phytocannabinoids in the treatment of cancer

A cannabis plant extract comprising a phytocannabinoid containing component and a non-phytocannabinoid containing component, wherein the phytocannabinoid containing component comprises 64-78% (w/w) of the cannabis plant extract and the non-phytocannabinoid containing component comprises a monoterpene fraction and a sesquiterpene fraction, in which a principal monoterpene sub-fraction is selected from myrcenes or pinenes and a principal sesquiterpene sub-fraction is selected from caryophyllenes or humulenes, and wherein a principal phytocannabinoid is cannabidivarin (CBDV).