Studies have not established the effect of bananas on breast cancer

Effect of bananas on breast cancer not established
Bananas are a good dietary source of manganese, vitamin B6 and fiber. Bananas have anti-inflammatory, antimicrobial, neuroprotective and antioxidant activities. Bananas also have been shown to reduce blood pressure and the risk of coronary heart disease. Bananas appear to protect the stomach lining against acid and ulcers.
Bananas also contain modest amounts of several compounds with known anti-cancer activities, including alpha-carotene, beta-carotene, melatonin, and dopamine. Components of bananas have been shown to inhibit proliferation of leukemia and liver cancer cells in the laboratory.
Mice fed bananas were found to have reduced development of malignant ascites induced by Erhlich carcinoma cells. Consumption of bananas has been found to be associated with reduced risks of childhood leukemia, glioma (a type of brain cancer), renal cell carcinoma, as well as oral, esophageal and colorectal cancer.

Breast cancer-related effects of eating bananas

The anticancer activities of bananas do not appear to be primarily due to antioxidant components since bananas have among the lowest levels of antioxidant activity of any fruit as measured by traditional methods. However, it is evident that bananas do not promote cancer and could have anti-cancer properties. One 2009 study of Chinese women found that banana consumption was associated with lower risk of breast cancer. A large 2016 U.S. prospective study reported that adolescents with high banana intake had reduced risk of breast cancer in adulthood.

Additional comments

Like plantains, unripe or green bananas must be cooked, whereas ripe common (or sweet) bananas usually are eaten raw.
Note that while we are continually searching for new evidence concerning this food, there is not much interest in it among cancer researchers so few recent studies are available.

Selected breast cancer studies

Indicators of Genotoxicity in Farmers and Laborers of Ecological and Conventional Banana Plantations in Ecuador Phenolic and glycidic profiling of bananas Musa sp associated with maturation stage and cancer chemoprevention activities Banana inflorescence: Its bio-prospects as an ingredient for functional foods Therapeutic potentials and compositional changes of valuable compounds from banana- A review B-Vitamin Intake from Diet and Supplements and Breast Cancer Risk in Middle-Aged Women: Results from the Prospective NutriNet-Santé Cohort Fruit and vegetable consumption in adolescence and early adulthood and risk of breast cancer: population based cohort study Comparative proximate, mineral elements and anti-nutrients composition between Musa sapientum (Banana) and Musa paradisiaca (Plantain) pulp flour Association of vitamin B6, vitamin B12 and methionine with risk of breast cancer: a dose-response meta-analysis Medicinal activities of the leaves of Musa sapientum var. sylvesteris in vitro Dietary Intake of Melatonin from Tropical Fruit Altered Urinary Excretion of 6-Sulfatoxymelatonin in Healthy Volunteers Influence of Polysaccharides of Banana Peel on Proliferation,Colony Formation and Expression of Nuclear Factor-κB in Human Breast Cancer Cells Antioxidant capacity and phenolic content of selected tropical fruits from Malaysia, extracted with different solvents Circulating melatonin and the risk of breast and endometrial cancer in women Musa acuminata (Del Monte banana) lectin is a fructose-binding lectin with cytokine-inducing activity Greater vegetable and fruit intake is associated with a lower risk of breast cancer among Chinese women Application of Visible and Near-Infrared Reflectance Spectroscopy (Vis/NIRS) to Determine Carotenoid Contents in Banana (Musa spp.) Fruit Pulp Cellular Antioxidant Activity of Common Fruits Development of Functional Foods in the Philippines