Rozados, Viviana R.Sánchez, Andrea M.Gervasoni, Silvia I.Berra, Héctor H.Matar, PabloScharovsky, O. Graciela2012-08-282012-08-282004-10Rozados, V. R., Sánchez, A. M., Gervasoni, S. I., Berra, H. H., Matar, P., & Graciela, S. O. (2004). Metronomic therapy with cyclophosphamide induces rat lymphoma and sarcoma regression, and is devoid of toxicity. Annals of Oncology, 15, 10, 1543-1550.0923-7534http://hdl.handle.net/2133/2013BACKGROUND: Our aim was to investigate the clinical efficacy and toxicity of metronomic administration of low-dose cyclophosphamide (Cy) in lymphoma and sarcoma rat tumour models. METHODS: Adult inbred rats were challenged with lymphoma TACB and sarcoma E100 s.c. on day 0. Animals were divided into two groups: group I, control, injected with saline three times a week; and group II, treated with Cy 10 mg/kg three times a week, from day 10 until the tumour was non-palpable, or 5 mg/kg three times a week from day 7. Tumours were measured and animals were weighed twice weekly. Periodic blood samples were taken for determination of urea, creatinine, serum glutamic-oxaloacetic transaminase, lactate dehydrogenase and haematological parameters. RESULTS: The administration of low-dose Cy eradicated established rat lymphomas and sarcomas; there was neither metastatic growth nor recurrence at primary sites for 100% of the lymphomas and 83% of the sarcomas. In addition, the treatment did not cause weight loss, and was devoid of haematological, cardiac, hepatic and renal toxicity. CONCLUSIONS: Metronomic administration of Cy at low doses on a thrice weekly schedule to already grown rat lymphomas and sarcomas demonstrated itself to be a successful antitumour therapy that did not cause weight loss and was devoid of haematological, cardiac, hepatic and renal toxicity.application/pdfenopenAccessCyclophosphamideLymphomaMetronomic dosingSarcomaToxicityartículo© European Society for Medical Oncology