Anti-PD-1 in Combination With Chemotherapy as First-Line Treatment to Lung Cancer

Key Inclusion Criteria: 1. Male or female, aged 18-75 years on the day of signing informed consent. 2. Have histologically or cytologically confirmed locally advanced or metastatic non-squamous NSCLC, squamous NSCLC, or extensive-stage SCLC. Note: Participants with mixed adenosquamous carcinoma may also be enrolled on a case-by-case basis after discussion with the medical monitors. 3. Have had no prior systemic therapy for advanced or metastatic disease. Prior neoadjuvant/adjuvant therapy or chemoradiation therapy with curative intent should have been completed at least 6 months prior to documentation of recurrence of disease. 4. Participants must be able to provide fresh or archival tumor tissues (formalin-fixed paraffin-embedded \[FFPE\] blocks or at least 10 unstained FFPE slides) with an associated pathological report. Key Exclusion Criteria: 1. Participants with a sensitizing mutation in EGFR gene or an ALK fusion oncogene (specifically for participants with non- squamous NSCLC). Participants with unknown mutation/fusion status of EGFR and/or ALK must take the respective test at the investigational sites (or other designated sites) prior to enrolment. 2. Prior malignancy active within the previous 2 years exceptions include the tumor under investigation in this trial, and locally recurring cancers that have undergone curative treatment, such as resected basal or squamous cell skin cancer, superficial bladder cancer or carcinoma in situ of the cervix or breast 3. Prior therapies targeting PD-1, PD-L1 or PD-L2 NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.