Annals of Oncology 13:161-166, 2002
© 2002 European Society for Medical Oncology
Phase I study of twelve-day prolonged infusion of high-dose ifosfamide and doxorubicin as first-line chemotherapy in adult patients with advanced soft tissue sarcomas
1Division of Medical Oncology, European Institute of Oncology, Via Ripamonti 435, 20141 Milan; 2Division of Medical Oncology, Hospital Gradenigo, Torino; 3Medical Oncology Service, Arcispedale S. Maria Nuova, Reggio Emilia; 4Medical Oncology, Hospital Cardarelli, Napoli, Italy; 5Oncology Institute of Southern Switzerland, Bellinzona and Mendrisio, Switzerland
Received 14 March 2001; revised 3 August 2001; accepted 17 August 2001.
Purpose
To determine whether a prolonged 12-day continuous infusion allows the administration of high-dose ifosfamide (IFO) with an acceptable toxicity profile when combined with full-dose doxorubicin (Adriamycin®; ADM) as first-line chemotherapy in patients with advanced soft tissue sarcomas.
Patients and methods
Escalating doses of continuous infusion IFO (815 g/m2) given on days 1 to 12 in combination with ADM 75 mg/m2 given on day 8 and prophylactic granulocyte colony-stimulating factor support were administered every 4 weeks to 35 chemonaïve patients with advanced soft tissue sarcomas.
Results
The maximum tolerated dose was IFO 15 g/m2. Hematological toxicity was the main dose-limiting toxicity and was dose dependent. Furthermore, thrombocytopenia was cumulative. Grade 4 (WHO) neutropenia and thrombocytopenia were recorded in 48% and 14% of courses, respectively. Eight patients experienced febrile neutropenia. A partial response was observed in 16 out of 30 assessable patients [53%, 95% confidence interval (CI) 2563]; median time to progression was 25 weeks (range 491).
Conclusions
This study proved that a prolonged 12-day continuous infusion allows an increase in the total IFO dose that can be safely combined with ADM. A multicentric phase II study by the Italian Sarcoma Group to assess its antitumor activity is currently ongoing in patients with advanced soft tissue sarcomas.
Key words: chemotherapy, continuous infusion, high dose, ifosfamide, soft tissue sarcomas
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