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Threshold Pharmaceuticals Inc. Message Board

  • wallstarb1 wallstarb1 Mar 30, 2012 12:08 PM Flag

    TH-302 + G 6.0m PFS

    http://www.abstractsonline.com/Plan/ViewAbstract.aspx?sKey=21a1ec6b-0397-4425-b223-31844c6077c3&cKey=edf55bb0-41e9-4d4e-8f01-368a2ebeee69&mKey={2D8C569E-B72C-4E7D-AB3B-070BEC7EB280}

    An open-label multi-center study of two dose levels of TH-302 (240 mg/m2 or 340 mg/m2) in combination with G versus G alone (randomized 1:1:1) was initiated in June 2010. G (1000 mg/m2) and T were administered IV over 30-60 minutes on Days 1, 8 and 15 of a 28-day cycle. Patients on the G arm could crossover after progression and be randomized to a G+T arm. The primary efficacy endpoint is a comparison of progression-free survival (PFS) between the combination arms and G alone (80% power to detect 50% improvement in PFS with one-sided alpha of 10%).
    214 pts (69 G: 71 G+T240: 74 G+T340) with advanced PAC including 77% distant metastases,62% involving liver and 11% with prior adjuvant tx; median age: 65 (range 29-86); 126 M/88 F; 79/128 ECOG 0/1. Median cycles received: G - 4, G+T240 - 5, G+T340 - 6. Median PFS was 3.6 mo in G vs 5.6 mo in G+T arms with HR of 0.61 (95% CI: 0.43 - 0.87) and logrank p-value of 0.005. Median PFS in G + T340 was 6.0 mo. RECIST best response was 12% in G, 17% in G+T 240 and 27% in G+T340. 153 (71%) patients had elevated CA19-9 and follow-up. CA19-9 decreases were significantly greater in the G+T groups and greatest in the G+T340 arm which had 37 of 53 (70%) pts with a greater than 50% CA19-9 decrease. One death (suicide) was considered possibly related to study drug. Adverse events leading to discontinuation were: 16% G, 15% G+T240 and 11% G+T340. Serious adverse events were balanced across the treatment arms. The most common non-laboratory events, fatigue (49%), nausea (43%), constipation (34%) and peripheral edema (38%), were similar across groups. Rash (14% G, 39% G+T240 and 45% G+T340) and stomatitis (6% G, 17% G+T240 and 36% G+T340) were significantly greater with G+T combination but no Grd 4 (4 pts with Grade 3). Grd 3/4 thrombocytopenia (11% G, 39% G+T240 and 59% G+T340) and Grd 3/4 neutropenia (28% G, 56% G+T240 and 59% G+T340) were higher with G+T. G+T combination with full dose G improved the efficacy of G with significantly longer PFS, higher response rate and greater CA19-9 declines. The G+T combination was well tolerated. Skin and mucosal toxicity and myelosuppression were the most common related adverse events with no increase in treatment discontinuation.

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