1. Why do immunosuppressed patients develop cancer?;Penn,1989
2. The problem of cancer in organ transplant recipients: An overview;Penn;Transplant Sci,1994
3. Malignancy after immunosuppressive therapy: How can the risk be reduced?;Penn;Clin Immunother,1995
4. De novo malignancy emerges as a major cause of morbidity and late failure in renal transplantation;Sheil;Transplant Proc,1993
5. Incidence of cancer in rheumatoid arthritis and other disorders after immunosuppressive treatment;Kinlen;Am J Med,1985