Hamster Greene melanoma in the rabbit eye: immunosuppressive treatment to improve this tumor model.
BACKGROUND
The hamster Greene melanoma (HGM) implanted in the anterior chamber of the rabbit eye has been used to study experimental therapies for human uveal melanoma. However, the occurrence of spontaneous necrosis limits the value of this model for long-term evaluation of experimental treatments. In the present study we tested the hypothesis that an immune response is the cause of this necrosis and that prevention of the immune response can prolong the experimentation time


METHODS
HGM was implanted in the anterior chamber of control, presensitized and immunosuppressed rabbits. The effects of sensitization and immunosuppression were assessed by clinical and histological observation


RESULTS
Sensitization led to a significant slowing down of tumor growth, but not to a difference in necrosis. Immunosuppressive treatment with cyclosporin A improved the success rate of implantation and decreased the amount of necrosis in the tumor


CONCLUSIONS
The immune response plays a role in the occurrence of necrosis. However, although immunosuppressive treatment with cyclosporin A decreased the amount of necrosis, significant necrosis still occurred, suggesting that other factors like angiogenesis play a part as well and still limit the usefulness of this model in the long-term evaluation of experimental therapies.
Department of Ophthalmology, University Hospital Leiden, The Netherlands.
I
I
de Waard-Siebinga
J L
JL
van Delft
D
D
de Wolff-Rouendaal
M
M
Jager
D000818:Animals; D000867:Anterior Chamber / Q000276:immunology / Q000473:pathology*; D006224:Cricetinae; D016572:Cyclosporine / Q000008:administration & dosage*; D004195:Disease Models, Animal; D005134:Eye Neoplasms / Q000276:immunology / Q000473:pathology*; D005260:Female; D007108:Immune Tolerance; D007114:Immunization; D008545:Melanoma / Q000276:immunology / Q000473:pathology*; D009336:Necrosis; D009368:Neoplasm Transplantation; D011817:Rabbits
D016572:Cyclosporine