THE INVENTION RELATES TO THE USE OF A COMBINATION OF CANNABINOIDS, PARTICULARLY TETRAHYDROCANNABINOL (THC) AND CANNABIDIOL (CBD), IN THE MANUFACTURE OF A MEDICAMENT FOR USE IN THE TREATMENT OF CANCER. IN PARTICULAR THE CANCER TO BE TREATED IS A BRAIN TUMOUR, MORE PARTICULARLY A GLIOMA, MORE PARTICULARLY STILL A GLIOBLASTOMA MULTIFORME (GBM). THE MOST ILLUSTRATIVE DRAWING IS FIG. 1.