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Abstract
4501 Background: Durable progression-free survival (PFS) rates for pts with intermediate- and poor-risk GCT approximate only 75% and 50%, respectively with standard BEP. This multicenter phase II study investigated first-line TIP in this population. Methods: Pts age ≥18 with untreated, IGCCCG intermediate- (LDH modified to ≥3x upper limit of normal) or poor-risk GCT were eligible. Pts received 4 cycles of TIP every 21 days, consisting of paclitaxel 120mg/m2 days 1-2; ifosfamide 1200mg/m2 days 1-5; and cisplatin 20mg/m2days 1-5, followed by G-CSF and levofloxacin for neutropenic fever prophylaxis. The primary endpoint was the complete response (CR) rate; secondary endpoints included PFS and toxicity. A Simon’s 2-stage design required a CR in ≥11/18 pts to proceed to stage 2, where with ≥27/41 CRs overall, the regimen would be considered active and worthy of further study. Results: Of 44 men (median age 27) enrolled; 38 had nonseminoma and 6 seminoma; 29 were poor-risk and 15 intermediate-risk. Primary site was testis in 30, mediastinum in 11, and retroperitoneum in 3. 42 pts had elevated markers and 14, 6, and 1 had liver, bone, and brain metastasis, respectively. The trial met its primary endpoint; of 41 evaluable pts, 28 achieved a CR (see Table) and 6 pts (5 with seminoma) achieved a partial response with negative markers (PR-). Two pts relapsed. With a median follow-up of 2.2 years, estimated 3-year PFS was 79% and 3-year overall survival (OS) 98% (see Table). There were no treatment-related deaths. Grade 3/4 toxicities were primarily hematologic and 6 (14%) pts developed neutropenic fever. Conclusions: TIP demonstrates promising efficacy and is well-tolerated in intermediate- and poor-risk GCT pts. A randomized trial of TIP vs. BEP has been initiated to compare efficacy. Clinical trial information: NCT00470366. [Table: see text]
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