Chemotherapy and Atezolizumab for Patients With Extensive Stage Small Cell Lung Cancer (SCLC) With Untreated, Asymptomatic Brain Metastases

Carboplatin 5-6 mg/mL/min AUC will be delivered over 30 - 60 minutes intravenously on Day 1 of each 21 day Cycle after completion of atezolizumab. For 4 cycles.

Etoposide 80-100 mg/m2 will be delivered over 60 minutes intravenously on Days 1-3 of each 21 day Cycle after completion of carboplatin (Day 1 only). For 4 cycles.

Atezolizumab 1200 mg will be delivered over 60 (± 15) minutes intravenously on Day 1 of each 21 day Cycle for 4 cycles then continue as monotherapy maintenance with the same schedule.