Abstract:
:Lethally X-irradiated LEW rats reconstituted with syngeneic bone marrow and given low-dose Cyclosporine A (CyA) for 5 weeks develop, after withdrawal of CyA, symptoms of disease resembling graft-vs.-host disease (GVHD) as seen after allogeneic bone-marrow transplantation. Symptoms of disease may include acute dermatitis and chronic disease resembling scleroderma. Since anti-class II MHC cytotoxic lymphocytes are generated in this model, it has been proposed as an anti-tumor regimen in humans. We now report that LEW rats treated according to this protocol may, after cessation of CyA administration, paradoxically develop malignant neoplasms. Of 48 experimental animals, 31 developed rapidly progressive subcutaneous and/or intracutaneous tumors commencing at 6 weeks, 13 weeks and 6 months after cessation of CyA. Tumors were of mesenchymal origin, usually high-grade sarcoma, adenocarcinoma or both mesenchymal and epithelial tumors. Such tumor incidence exceeded the incidence of tumor growth in X-irradiated controls, and in rats subjected to thymectomy prior to X-irradiation and CyA administration. CyA by itself induced no tumors. Our results show that total body X-irradiation is required for tumor development but that the presence of CyA-induced autoimmune disease increases the incidence significantly.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Wodzig KW,Beijleveld LJ,Damoiseaux JG,Arends JW,van Breda Vriesman PJdoi
10.1002/(sici)1097-0215(19970729)72:3<530::aid-ijcsubject
Has Abstractpub_date
1997-07-29 00:00:00pages
530-5issue
3eissn
0020-7136issn
1097-0215pii
10.1002/(SICI)1097-0215(19970729)72:3<530::AID-IJCjournal_volume
72pub_type
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