Diffuse iris melanoma was confirmed by light-microscopic examination in 10 formalin-fixed, paraffin-embedded globes from 10 cats. To determine if feline leukemia virus or a replication defective feline leukemia virus, feline sarcoma virus, was present in these anterior uveal melanomas, immunohistochemistry and polymerase chain reaction for feline leukemia virus were utilized. Immunohistochemical staining for feline leukemia virus glycoprotein 70 was performed on all 10 tumors using an avidin-biotin complex technique. The DNA was extracted from each specimen and a 166-base pair region of the feline leukemia virus long terminal repeat was targeted by polymerase chain reaction. Immunohistochemical staining for feline leukemia virus glycoprotein 70 and polymerase chain reaction amplification of a feline leukemia virus long terminal repeat region were negative in all cases. Feline leukemia virus/feline sarcoma virus was not detected in any neoplasms and therefore was unlikely to play a role in the tumorigenesis of these feline diffuse iris melanomas.
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