The consumption of berries is perfectly safe, but the fact that some health effects have been scientifically proven does not imply that they can cure cancer if consumed regularly or excessively.
Including berries as part of our diet is completely safe in and healthy due to its antioxidant properties. The recommended fruit intake during treatment indicates three pieces or portions of fresh fruit (including berries) daily and as varied as possible, as each fruit has different properties that are beneficial to our health. The best way to take advantage of the properties of fruit is to consume local and seasonal fruit.