Research has found that a compound in olive oil may help suppress the growth of brain tumours

This article discusses a recent study by the University of Edinburgh’s school of biological sciences that found potential for the main ingredient found in olive oil, oleic acid to stimulate the production of a molecule that can prevent the growth of cancer causing proteins.

http://www.theage.com.au/lifestyle/health-and-wellbeing/nutrition/why-some-say-olive-oil-is-the-worlds-healthiest-ingredient-20170605-gwkmw4.html