Gemcitabine With or Without Bevacizumab in Treating Patients With Locally Advanced or Metastatic Pancreatic Cancer

Overview

This randomized phase III trial is studying gemcitabine and bevacizumab to see how well they work compared to gemcitabine alone in treating patients with locally advanced or metastatic pancreatic cancer. Drugs used in chemotherapy, such as gemcitabine, work in different ways to stop tumor cells from dividing so they stop growing or die. Monoclonal antibodies such as bevacizumab can locate tumor cells and either kill them or deliver tumor-killing substances to them without harming normal cells. Bevacizumab may also stop the growth of tumor cells by stopping blood flow to the tumor. Combining gemcitabine with bevacizumab may kill more tumor cells. It is not yet known whether gemcitabine is more effective with or without bevacizumab in treating pancreatic cancer.

PRIMARY OBJECTIVES: I. To determine if combination chemotherapy with gemcitabine and bevacizumab achieves superior survival compared to gemcitabine and placebo in patients with previously untreated advanced pancreatic cancer. SECONDARY OBJECTIVES: I. To compare the objective response rates, duration of response, progression free survival, and toxicity of these two regimens in patients with advanced pancreatic cancer. II. To measure baseline levels of VEGF and correlate with treatment outcome. III. To measure baseline and on treatment levels of additional growth factors that may be co- or counter- regulated with VEGF and correlate with response to treatment. IV. To measure baseline and on treatment levels of coagulation and endothelial cell activation markers that may predict for thrombotic or bleeding risks related to treatment. V. To generate protein expression profiles using a MALDI-TOF based platform from serum samples. To analyze and compare protein expression profiles to elucidate ion peaks that differentiate patients who respond to therapy from patients who do not respond. To identify proteins responsible for the differentially expressed ion peaks. To develop quantitative assays for each of these proteins. VI. To assess any differences in overall survival within the treatment arm (gemcitabine + bevacizumab), between the two VEGF genotypic groups: Group 1 denoted by individuals with CT or TT genotypes and Group 2 consisting of individuals with CC genotypes. VII. To conduct an exploratory analysis of gene-toxicity, gene-response, and gene-survival relationships for the various polymorphisms described in the genes implicated in gemcitabine pharmacology (CDA, DCK, DCTD, SLC29A1, SLC28A1, SLC29A2). An exploratory quantitative interaction between the genotypes (group 1 or 2) and the treatment arms (gemcitabine + bevacizumab or gemcitabine + placebo) in predicting overall survival will also be evaluated. VIII. To identify specific SNPs and genetic variation that are associated with differences among patients in the risk of toxicity. IX. To compare the effects of gemcitabine + bevacizumab versus gemcitabine + placebo on resource utilization, cost, and utilities, and if applicable, to make estimates of marginal cost-utility. OUTLINE: This is a randomized, double-blind, placebo-controlled, multicenter study. Patients are stratified according to ECOG performance status (0-1 vs 2), disease extent (metastatic vs locally advanced), and prior radiotherapy (yes vs no). Patients are randomized to 1 of 2 treatment arms. Arm I: Patients receive gemcitabine IV over 30 minutes on days 1, 8, and 15 and bevacizumab IV over 30-90 minutes on days 1 and 15. Arm II: Patients receive gemcitabine IV as in arm I and placebo IV over 30-90 minutes on days 1 and 15. In both arms, courses repeat every 28 days in the absence of disease progression or unacceptable toxicity. Patients are followed every 3 months for 1 year and then every 6 months for 3 years. PROJECTED ACCRUAL: A total of 590 patients (295 per treatment arm) will be accrued for this study within 26.8 months.