Six cats developed malignant lymphoma 3 to 45 months after treatment for vaccine site-associated sarcoma. During the same time period, 184 cats were evaluated in the teaching hospital for vaccine site-associated sarcomas. Feline vaccine site-associated sarcoma is not believed to be associated with feline leukemia virus (FeLV) infection. Five of six cats were negative by enzyme-linked immunosorbent assay for FeLV antigens at the times of diagnosis of both sarcoma and lymphoma, and no cats were infected with feline immunodeficiency virus.

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