1. Malignancies associated with immunosuppressive or cytotoxic therapy;Penn;Surgery,1978
2. Cancers following cyclosporine therapy;Penn;Transplantation,1987
3. Significance of azathioprine metabolites;Elion;Proc. Roy. Soc. Med.,1972
4. Adenosine deaminase deficiency in two patients with severely impaired cellular immunity;Gilbett;Lancet,1972
5. Azathioprine induction of lymphomas and squamous cell carcinomas in rats;Cohen;Cancer Res.,1983