Disclosed are methods for treating, preventing, or inhibiting cancer in a subject comprising administering at least one polyphenolic compound and at least one inhibitor of reactive oxygen species to the subject. The polyphenolic compound may be derived or isolated from plants. In some embodiments, the polyphenolic compound is a flavonoid. In other embodiments, the polyphenolic compound is a non-flavonoid. Other methods and kits are also disclosed as well as pharmaceutical compositions.