1. National Cancer Institute and Clinical Center, National Institutes of Health Bethesda, Md.
2. National Cancer Institute, National Institutes of Health, Bethesda, Md. Present address: Stanford University Hospital, Palo Alto, Calif.
3. National Cancer Institute, National Institutes of Health, Bethesda, Md.
4. Hematology Department, Clinical Center, National Institutes of Health, Bethesda, Md.
5. Medicine Branch, National Cancer Institute, National institutes of Health, Bethesda, Md.