In order to verify that green tea consumption, due to its high antioxidant power, has the capacity to reduce the risk of developing cancer or to exert a curative effect, further studies on humans are still needed.
Drinking green tea is a good way to increase fluid intake and promote a good level of hydration, which is essential for a person undergoing cancer treatment. It will also provide antioxidants with beneficial health effects. High consumption of green tea (more than two cups a day) could lead to interactions with some of the drugs used in during treatment and you should consult your oncologist.
Green tea contains theine, which has stimulant properties and is therefore not recommended to drink before going to bed or if you have insomnia.