A randomized, phase III, multicenter, double-blind, placebo-controlled study evaluating the efficacy and safety of onartuzumab (metmab) in combination with 5-fluorouracil, folinic acid, and oxaliplatin (MFOLFOX6) in patients with metastatic HER2-negative,

� To evaluate the efficacy of onartuzumab + mFOLFOX6 compared with placebo + mFOLFOX6 as measured by overall survival (OS) in patients with previously untreated HER2�negative metastatic gastroesophageal cancer (GEC) classified as Met IHC 2+ or 3+ (Met 2+/3+ subgroup) � To evaluate the efficacy of onartuzumab + mFOLFOX6 compared with placebo + mFOLFOX6 as measured by OS in patients with previously untreated HER2 negative metastatic GEC classified as Met-IHC 1+, 2+, or 3+ (intent-to-treat [ITT] population)