1. Department of Otolaryngology-Head and Neck Surgery (S-H.A.), College of Medicine, Seoul National University Bundang Hospital, Kyunggi-do 463-707, South Korea
2. Departments of Head and Neck Surgery (Y.C.H., S.Y.L., G.L.C.), Houston, Texas 77030
3. Pathology (M.D.W.), Houston, Texas 77030
4. Molecular and Cellular Oncology (S.Y.L.), Houston, Texas 77030
5. Cancer Biology (G.L.C.), The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030