Other components with anticarcinogenic properties are anthocyanins, quercetin, and tannins, all of which have been shown to protect against ultraviolet radiation, acting on free radicals, suppressing the activity of cyclooxygenase-2 (COX-2), and acting against the enzyme myeloperoxidase, thus preventing the development of skin cancer (125–127). Here, PTGS2 is linked to skin cancer.