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Wednesday 09 May 2007

A phase II study using a topoisomerase I-based approach in patients with multiply relapsed germ-cell tumours.

By: Shamash J, Powles T, Mutsvangwa K, Wilson P, Ansell W, Walsh E, Berney D, Stebbing J, Oliver T.

Ann Oncol 2007 May;18(5):925-30

BACKGROUND: The outcome of patients with germ-cell tumours (GCTs), who relapse more than once or relapse with a mediastinal primary is poor. We have shown that topoisomerase 1 may be an attractive target in relapsed GCT. We investigated the role of irinotecan, paclitaxel and oxaliplatin (IPO) followed by topotecan-based high-dose therapy in responding patients, in this patient population. PATIENTS AND METHODS: Twenty-eight patients with multiply relapsed gonadal and mediastinal GCT were recruited to this phase 2 study. All patients received IPO chemotherapy and 12 (43%) went on to receive high-dose therapy. The outcome of these patients was assessed using the Kaplan-Meier method with a median progression-free follow-up of 1 year. RESULTS: Twenty patients (71%) responded to the therapy including five complete remissions (18%), 13 (46%) marker-negative partial responses and two (7%) marker-positive partial responses. Nine (32%) patients continue to be progression free, and the median survival for the whole group currently measures 17 months. Out of 12 individuals who received subsequent high-dose therapy consolidation, seven (58%) remain progression free. The commonest grade III/IV toxicity was infection (68%) and there were no IPO-related toxic deaths; there was one death from high-dose therapy. CONCLUSION: Topoisomerase I-based IPO chemotherapy that lacks etoposide is very active in multiply relapsed GCT. This data merit further investigation.

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