Study to Assess Pharmacokinetics, Immunogenicity and Safety/Tolerability of Patritumab (U3-1287)

Process 2 patritumab will be administered intravenously as a single, loading dose of 18 mg/kg over approximately 60 minutes at Cycle 1 Day 1 followed by 9 mg/kg administered every 21 days as a maintenance dose starting at Cycle 2 Day 1. This study will be conducted in 2 phases: a main study and an extension phase. The PK profile of Process 2 patritumab will be compared to historical data for Process 1 patritumab. Specifically, the PK parameters (AUC0-21d and Cmax as primary endpoints) for Process 2 patritumab 18 mg/kg (loading dose) will be compared to the PK parameters of Process 1 patritumab 18 mg/kg. Process 2 patritumab serum concentrations will be compared to Process 1 patritumab serum concentrations collected in the Phase 1 and Phase 2 studies by population PK methods and will be reported separately.