A Study of Pertuzumab in Combination With Trastuzumab and Chemotherapy in Participants With Human Epidermal Growth Factor Receptor 2 (HER2)-Positive Metastatic Gastroesophageal Junction or Gastric Cancer

Study Summary

This double-blind, placebo-controlled, randomized, multicenter, international, parallel arm study will evaluate the efficacy and safety of pertuzumab in combination with trastuzumab, fluoropyrimidine and cisplatin as first-line treatment in participants with HER2-positive metastatic gastroesophageal junction (GEJ) or gastric cancer (GC). Participants will be randomized to receive pertuzumab 840 milligrams (mg) or placebo intravenously every 3 weeks (q3w) in combination with trastuzumab (initial dose of 8 milligrams per kilogram \[mg/kg\] intravenously \[IV\] followed by 6 mg/kg IV q3w) and cisplatin and fluoropyrimidine (capecitabine or 5-fluorouracil) for the first 6 treatment cycles. Participants will continue to receive pertuzumab or placebo and trastuzumab until disease progression occurrence of unacceptable toxicity or withdrawal from the study for another reason.

Primary Outcome

Overall survival (OS) was defined as the time from randomization to death from any cause. For participants who were still alive on the date of clinical data cut-off for the OS analysis, the last date when the participant was known to be alive on, or prior to the clinical cut-off date, was used to determine the censoring date. Participants who did not have any post-baseline data (e.g., dosing records, imaging dates, visit dates) were censored at the date of randomization plus 1 day.

Conditions Studied

Interventions

• DRUG Placebo
• DRUG Capecitabine
• DRUG Cisplatin
• DRUG 5-Fluorouracil
• DRUG Pertuzumab

Study Locations (20)