Inclusion Criteria:
1. Male/female participants who are at least 18 years of age on the day of signing informed consent.
2. Histologically confirmed, treatment naïve, locally advanced, or metastatic (stage IIIB - IV (per AJCC version 8), squamous or non-squamous NSCLC with documented PD-L1 expression and is not eligible for definitive chemo-radiation curative therapy and surgery.
3. Patients must be treatment naïve with respect to locally advanced or metastatic disease. Patients who received prior treatment with curative intent for early stage disease and develop recurrent advanced/ metastatic disease must have completed treatment at least 6 months prior to first dose of IP.
4. Have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1. Evaluation of ECOG is to be performed within 7 days prior to the first dose of study intervention.
5. At least 1 measurable lesion by RECIST 1.1 in solid tumors criteria.
6. Participants must have adequate organ function including the following laboratory values at the screening visit as per Table 2:
7. If a participant has brain or meningeal metastases, the participant must meet the following criteria:
1. Metastatic brain lesions do not require immediate intervention. Note: Asymptomatic, treated and stable as well as not requiring steroids for at least 2 weeks prior to start study Treatment.
2. Carcinomatous meningitis is excluded regardless of clinical stability.
8. A male participant must agree to use a contraception starting with the first dose of study treatment through the treatment period and for at least 90 days after the last dose of study treatment and refrain from donating sperm during this period.
9. A female participant is eligible to participate if she is not pregnant, not breastfeeding, and at least one of the following conditions applies:
1. Not a woman of childbearing potential (WOCBP), OR,
2. A WOCBP who agrees to follow the contraceptive guidance during the treatment period and for at least 180 days after the last dose of study treatment.
10. Can provide evaluable archival tumor tissue sample or willing to provide tissue from newly obtained core or excisional biopsy or fine needle aspirate (FNA) cell block form of tumor lesion not previously irradiated. Note: Formalin fixed, paraffin embedded (FFPE) tissue blocks or slides allowed.
Exclusion Criteria:
1. Presence of EGFR, ALK , ROS1 mutation(s).
2. Patients with locally advanced disease who can receive other potentially curative therapies, such as patients who can afford to pay for or can otherwise access clinically approved doses of immunotherapy.
3. Prior treatment with any anti-PD-1, anti-PD-L1 or any other antibody targeting an immune checkpoint.
4. Use of any live vaccines against infectious diseases within 28 days of first dose of IP(s).
5. Underlying medical conditions that, in the Investigator's or Sponsor PI's opinion, will make the administration of IP(s) hazardous, including but not limited to interstitial lung disease, including history of interstitial lung disease or non-infectious pneumonitis (lymphangitic spread of NSCLC is not disqualifying), or active viral, bacterial, or fungal infections requiring parenteral treatment within 14 days of the initiation of the IP.
6. Concurrent medical condition requiring the use of supra-physiologic doses of corticosteroids (\> 10 mg/day of oral prednisone or equivalent) or immunosuppressive medications (absorbable topical corticosteroids are not excluded).
7. Active hepatitis B and C infection or human immunodeficiency virus antibody (HIV-1 and/or HIV-2) positive at screening.
8. Known hypersensitivity to recombinant proteins, or any excipient contained in the IP formulations.
9. Known history of autoimmune disease currently on immunosuppressive medications.
10. Known history of second malignancy within two years prior enrolment.
11. Prognosis of three months or less.
12. A WOCBP who has a positive urine pregnancy test within 72 hours prior to treatment allocation. If the urine test positive or cannot be confirmed as negative, a serum pregnancy test will be required.
