Previous research on both animals and human cells had suggested the hot drink could boost the body’s defenses against the cancer.
However, the latest analysis looking at 54,000 women found no association between drinking green tea and breast cancer risk.
Dr Motoki Iwasaki, from the National Cancer Center, Tokyo, worked with a team of researchers to carry out the study.
He said: ‘Results from human studies have been inconclusive. Our large-scale, population-based prospective cohort study is one of the first to include a wide range of tea intakes; women who drank green tea less than 1 cup per week to those who drank 10 or more cups per day.
‘It found no overall association between green tea intake and the risk of breast cancer”
The study published in BioMed Central’s open access journal Breast Cancer Research.