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Ursolic acid is a pentacyclic triterpene acid, used in cosmetics,[2] that is also capable of inhibiting various types of cancer cells by inhibiting the STAT3 activation pathway[3][4] and human fibrosarcoma cells by reducing the expression of matrix metalloproteinase-9 by acting through the glucocorticoid receptor. Ursolic acid is present in many plants, including apples, basil, bilberries, cranberries, elder flower, peppermint, rosemary, lavender, oregano, thyme, hawthorn, prunes. Apple peels contain high quantity of ursolic acid and related compounds which are responsible for the anti-cancer activity of apple. Ursolic acid can also serve as a starting material for synthesis of more potent bioactive derivatives, such as anti-tumor agents

Ursolic acid, a natural pentacyclic triterpenoid carboxylic acid, is the major component of some traditional medicine herbs and is well known to possess a wide range of biological functions, such as antioxidative, anti-inflammatory, antihyperlipidemic and anticancer activities, that are able to counteract endogenous and exogenous biological stimuli. Ursolic acid has been noted for their antitumor-promotion activities. Ursolic acid is capable of inducing apoptosis in tumor cells on one side and to prevent malignant transformation of normal cells on the other side. It also interferes with numerous enzymes, including the ones serving directly to DNA synthesis

Ursolic acid inhibits cyclooxygenase-2 transcription in human mammary epithelial cells. Subbaramaiah K, Michaluart P, Sporn MB, Dannenberg AJ. Cancer Res. 2000 May 1;60(9):2399-404. PMID: 10811116