1. Division of Hematology-Oncology, Critical Care Medicine and Genetic Medicine Program, Cornell University Medical College, New York, New York 10021
2. Sloan-Kettering Institute for Cancer Research, New York, New York 10021
3. Division of Pulmonary, Critical Care Medicine and Genetic Medicine Program, Cornell University Medical College, New York, New York 10021
4. Department of Pathology, Sapporo City General Hospital, Sapporo 060-8604, Japan
5. ImClone Systems Inc., New York, New York 10014