1. Department of Endocrine Neoplasia and Hormonal Disorders, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
2. Division of Pathology and Laboratory Medicine, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
3. Department of Dermatology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas.
4. Present address: Oncology Medical Affairs, Sanofi-Aventis, Bridgewater, New Jersey.