Spontaneous regression of lymphosarcoma in a dog

Lymphosarcoma in a dog regressed without chemotherapy or radiotherapy. The drugs administered to the dog before the regression were not sufficient to influence the neoplastic disease. During the next 12 months, the dog was evaluated periodically for signs of recurrence of the lymphosarcoma. The disease remained in clinical regression during this period. Spontaneous regression of lymphosarcoma in dogs is extraordinarily unusual. A variety of factors may affect remission in, and survival times of dogs with lymphosarcoma.