Adjuvant interferon treatment and the late development of cerebral metastases in a patient with osteosarcoma.

A consecutive series of patients with osteocarcoma have been receiving adjuvant interferon therapy at the Karolinska Hospital in Stockholm. We report here a case of tibial chondroblastic Grade III osteosarcoma, a boy aged 17 years, who received interferon therapy for 15 months and survived more than 5 years. The first sign of tumour spread was multiple cerebral metaseases--an observation suggesting an antitumour effect of human leucocyte interferon on osteosarcoma.