Vitamin A palmitate
Retinyl Palmitate is a naturally-occurring phenyl analogue of retinol (vitamin A) with potential antineoplastic and chemopreventive activities.  As the most common form of vitamin A taken for dietary supplementation, retinyl palmitate binds to and activates retinoid receptors, thereby inducing cell differentiation and decreasing cell proliferation.  This agent also inhibits carcinogen-induced neoplastic transformation, induces apoptosis in some cancer cell types, and exhibits immunomodulatory properties. (NCI04)