“…Tumor growth is dependent on angiogenesis for maintenance of an adequate blood supply 6 . Previous studies in our laboratory have demonstrated the effectiveness of the antiangiogenesis agent, retinoic acid (RA), in the chemoprevention of HNSCC 7,8 . It has a high incidence of side effects, however, which include dry skin, cheilitis, conjunctivitis, and hypertriglyceridemia 5 …”