This randomized, open-label study will evaluate the safety and efficacy of atezolizumab (MPDL3280A) in combination with carboplatin + paclitaxel or carboplatin + nab-paclitaxel compared with treatment with carboplatin + nab-paclitaxel in chemotherapy-naive participants with Stage IV squamous NSCLC.
Atezolizumab 1200 milligrams (mg) intravenous infusion (IV) on day 1 of each 21-day cycle.
Carboplatin area under the concentration curve (AUC) 6 milligrams per milliliter per minute (mg/mL/min) on Day 1 of each 21-day cycle for 4 or 6 cycles.
Nab-paclitaxel 100 milligrams per meter squared (mg/m\^2) IV on Day 1, 8, and 15 of each 21-day cycle for 4 or 6 cycles.
Paclitaxel 200 mg/m\^2 IV on Day 1 of each 21-day cycle for 4 or 6 cycles. Participants of Asian race/ethnicity will be administered paclitaxel 175 mg/m\^2 IV.
Buenos Aires, Argentina
Córdoba, Argentina
La Rioja, Argentina
Pergamino, Argentina
Santa Rosa, Argentina
Viedma, Argentina