Sym004 in Subjects With Stage IV Non-small Cell Lung Cancer

Sym004 will be administered as an intravenous infusion at a dose of 6 mg/kg weekly until unacceptable toxicity, progressive disease, withdrawal of consent, or until the subject meets any of the criteria for subject withdrawal, or withdrawal from the investigational medicinal product (IMP) in combination with platinum-doublet chemotherapy regimen of cisplatin/gemcitabine (cisplatin 75 mg/m\^2 on Day 1 plus gemcitabine 1250 mg/m\^2 on Days 1 and 8 of every 3-Week cycle intravenously for a maximum of 6 treatment cycles).

Sym004 will be administered as an intravenous infusion at a dose 6 mg/kg weekly until unacceptable toxicity, progressive disease, withdrawal of consent, or until the subject meets any of the criteria for subject withdrawal, or withdrawal from the IMP in combination with platinum-doublet chemotherapy regimen of cisplatin/pemetrexed (cisplatin 75 mg/m\^2 plus pemetrexed 500 mg/m\^2 on Day 1 of every 3-Week cycle intravenously for a maximum of 6 treatment cycles).

Sym004 will be administered as an intravenous infusion at a dose 6 mg/kg weekly until unacceptable toxicity, progressive disease, withdrawal of consent, or until the subject meets any of the criteria for subject withdrawal, or withdrawal from the IMP in combination with platinum-doublet chemotherapy regimen of carboplatin/paclitaxel (carboplatin area under the concentration-time curve (AUC) = 6 milligram per millilitre per minute \[mg/mL/min\] plus paclitaxel 225 mg/m\^2 on Day 1 of 3-Week cycle intravenously for a maximum of 6 treatment cycles).

Sym004 will be administered as an intravenous infusion at a dose 6 mg/kg on Day 1 and 12 mg/kg on Day 8 of a 3-Week cycle until unacceptable toxicity, progressive disease, withdrawal of consent, or until the subject meets any of the criteria for subject withdrawal, or withdrawal from the IMP in combination with platinum-doublet chemotherapy regimen of carboplatin/paclitaxel (carboplatin AUC = 6 mg/mL/min plus paclitaxel 225 mg/m\^2 on Day 1 of every 3-Week cycle intravenously for a maximum of 6 treatment cycles).