Two patients with far-advanced seminoma of the testis were given single intravenous injections of high dose (1.5 and 2.0 gm. per m.2) cyclophosphamide. Both patients experienced prompt, dramatic objective regressions without severe toxicity. Definitive radiotherapy, deemed technically unfeasible before cyclophosphamide administration, was administered subsequently. Long-term complete remissions (more than 16 and 28 months) have been attained in both patients. High dose cyclophosphamide may prove useful in selected patients with disseminated seminoma.
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