Konference: 2014 39th Congress ESMO - účast ČR
Kategorie: Kolorektální karcinom
Číslo abstraktu: 533P
Autoři: M.D. Al B. Benson III; M.D. John A. Bridgewater; doc. MUDr. Igor Kiss, Ph.D.; Dr. Ferry Eskens; Jihong Chen; Carolyn Sasse; Sandra Vossen; Chip van Sant; Howard Ball; Anne Keating; Andrew Krivoshik
Tivo is a selective oral VEGF TKI with a long half-life and activity against all 3 VEGFRs. Preclinical data showed antitumor activity of tivo when added to chemotherapy (chemo). In a phase 1b study of tivo + mFOLFOX6 in mCRC and other GI cancers, partial responses were shown and the combination was well tolerated. Based on these results, a randomized, open-label, phase 2 trial of tivo + mFOLFOX6 (arm A) vs bev + mFOLFOX6 (arm B) in previously untreated mCRC was initiated.
Eligible patients had no prior systemic chemo, no fluorouracil-containing adjuvant therapy in the previous 6 mo, and an ECOG PS ≤1. No prior VEGF therapy, including bev was permitted, nor a history of significant thromboembolic or vascular disorders within 6 mo before study entry. The primary end point was PFS by investigator radiologic assessment. Secondary end points included PFS by IRR, OS, ORR, DOR, TTF, and biomarker subgroup analysis of LDH; VEGF A, C, D; CD68; myeloid-derived gene signature and serum soluble cytokines. Subjects were randomized 2:1 and stratified by LDH, origin of cancer, and number of metastatic sites, and received mFOLFOX6 q2w on days 1 and 15 of each 28-day cycle with either tivo 1.5 mg qd for 21 days followed by 7 days off treatment or bev 5 mg/kg q2w.
Between 12/20/11 and 4/28/13, 265 subjects were randomized: 177 to arm A and 88 to arm B. A prespecified interim analysis included 95 PFS events and met prespecified futility criteria. mPFS (arm A vs arm B) was 9.4 mo vs 10.7 mo (P = .706); mORR: 45.2% vs 43.2% (P = .718). The overall safety profile was comparable between arms, but there were more drug-related ≥grade 3 treatment-emergent AEs in arm A (57.1% vs 35.6%), higher ALT or AST elevations >3 × ULN (16.6% vs 5.7%), and increase in grade for platelets (65.9% vs 43.7%). The most common toxicities included diarrhea, nausea, fatigue, neutropenia, and hypertension.
The addition of tivo to mFOLFOX6 vs bev + mFOLFOX6 met prespecified futility criteria and resulted in comparable PFS, ORR, TTF, and DOR with an acceptable safety profile. At the interim analysis, there were no significant associations between serum/tumor biomarkers and outcomes.
J.A. Bridgewater: • Advisory board: 2013, 1; I. Kiss: • Ad bds: Roche, Merck, Bayer • Speakers’ bureau: Roche, Merck, Amgen, Bayer, Sanofi; J. Chen, C. Sasse, S. Vossen, C. van Sant, H. Ball, A. Keating, A. Krisvoshik: Astellas employee • Stock • Salary; All other authors have declared no conflicts of interest.
Datum přednesení příspěvku: 29. 9. 2014