Inclusion Criteria:

          1. Has a pathologically proven recurrent or metastatic non squamous non small cell lung
             cancer

          2. (a) Previously received at least one line of prior systemic therapy for metastatic
             disease.

             i. If the patient has a sensitizing EGFR mutation or ALK rearrangement, the patient
             must have received at least one prior targeted therapy for metastatic disease (ie,
             EGFR TKI therapy or ALK TKI therapy, respectively).

             ii. There is no limit on prior therapies allowed. Patients must have completed
             previous treatment (including other investigational therapy) in greater than or equal
             to the following times prior to initiation of trial treatment:

               1. Anti cancer monoclonal antibody (mAb) therapy must be completed ≥ 3 weeks prior
                  to trial treatment

               2. Chemotherapy administered in a daily or weekly schedule must be completed ≥ 1
                  week prior to trial treatment

               3. Chemotherapy administered in an every 2 week schedule must be completed ≥ 2 weeks
                  prior to trial treatment

               4. Chemotherapy administered in an every 3 week schedule must be completed ≥ 3 weeks
                  prior to trial treatment

               5. Targeted small molecule therapy must be completed ≥ 1 week prior to trial
                  treatment OR (b) Have not received prior systemic therapy for their cancer in
                  recurrent or metastatic setting, AND have a tumor with Tumor Proportion Score
                  (TPS) ≥ 50% as measured by 22C3 PD L1 IHC test, AND no evidence of a sensitizing
                  EGFR mutation or ALK rearrangement.

          3. Prior radiation therapy allowed as long as completed in the following times prior to
             initiation of trial treatment:

               1. Definitive curative intent radiation ≥ 3 weeks prior to trial treatment

               2. Palliative body radiation ≥ 1 week prior to trial treatment

               3. Stereotactic brain radiation ≥ 1 week prior to trial treatment

               4. Whole brain radiation ≥ 2 weeks prior to trial treatment

          4. Patients with previously treated (with radiation or surgery) brain metastases that are
             stable are allowed. Patients with stable or progressing metastases must have
             metastases ≤ 1.5 cm, be asymptomatic, and either not be on steroids or be on 10 mg
             prednisone equivalent or less.

          5. Has measurable disease based on RECIST v1.1 criteria

          6. Is medically able and willing to undergo needle biopsy of a tumor lesion. PD L1
             expression is not required to enroll in the trial.

          7. Has life expectancy ≥ 3 months

          8. Ability to understand and the willingness to sign a written informed consent document.

          9. ≥ 18 years of age on day of signing informed consent

         10. ECOG performance status of 0 or 1 (Appendix A)

         11. Adequate organ function:

               1. Absolute neutrophil count (ANC) ≥ 1,000/mcL

               2. Platelets ≥ 75,000/mcL

               3. Hemoglobin ≥ 8 g/dL

               4. Serum creatinine ≤ 1.5 x upper limit of normal (ULN) OR measured or calculated
                  creatinine clearance ≥ 50 mL/min for patient with creatinine levels > 1.5 x
                  institutional ULN

               5. Serum total bilirubin ≤ 1.5 x ULN OR Direct bilirubin ≤ ULN for patients with
                  total bilirubin levels > 1.5 ULN

               6. AST (SGOT) and ALT (SGPT) ≤ 3 x ULN OR ≤ 5 x ULN for patients with liver
                  metastases

         12. Female patients of childbearing potential must have a negative urine or serum
             pregnancy test prior to the first dose of trial treatment. They must also agree to two
             barrier methods or a barrier method plus a hormonal method, or agree to abstain from
             heterosexual activity, for the course of the study through 120 days after the last
             dose of trial treatment. Females who have been surgically sterilized or are free from
             menses for > 1 year (postmenopausal) may enroll.

         13. Male patients with a female partner of childbearing potential should agree to use a
             barrier method of contraception, or agree to abstain from heterosexual activity for
             the course of the study through 120 days after the last dose of trial treatment.

        Exclusion Criteria:

          1. Is currently receiving another investigational therapy

          2. Has received prior anti PD 1 or anti PD L1 therapy

          3. Has clinically significant toxicities from previous anti cancer therapy that have not
             resolved, or have not stabilized at a new baseline

          4. Has undergone a surgical procedure involving general anesthesia within 2 weeks of
             starting trial treatment, or has inadequate healing or recovery from complications of
             surgery prior to starting trial treatment. This does not apply to low risk procedures
             such as thoracentesis; paracentesis; chest tube/PleurX catheter placement; line
             placement; needle biopsy of tumor; and bronchoscopy.

          5. Is receiving high dose systemic steroid therapy within 3 days of trial treatment.
             Topical and intraarticular steroid injections are allowed, as are physiologic doses of
             systemic steroids (≤ 10 mg of prednisone equivalent daily).

          6. Has carcinomatous meningitis as determined by positive CSF cytology

          7. Has known active additional malignancy that is undergoing active treatment.

          8. Has active autoimmune disease that has required systemic treatment in the past 2 years
             (ie, with use of disease modifying agents, supra physiologic doses of systemic
             corticosteroids or immunosuppressive drugs). Replacement therapy (eg, thyroxine,
             insulin; or physiologic corticosteroid replacement therapy for adrenal or pituitary
             insufficiency, etc.) is not considered a form of systemic treatment. Asthma; type I
             diabetes mellitus; hypothyroidism; and vitiligo are allowed.

          9. Has a history or current evidence of any condition, therapy, or laboratory abnormality
             that might confound the results of the trial, interfere with the patient's
             participation for the full duration of the trial, or is not in the best interest of
             the patient to participate, in the opinion of the treating investigator. This includes
             known active tuberculosis; Grade 3 active infection; history of allogeneic bone marrow
             transplant or solid organ transplant; known history of Human Immunodeficiency Virus
             (HIV); known active Hepatitis B (eg, Hep B DNA positive in prior 3 months) or known
             active Hepatitis C (eg, HCV RNA [qualitative] is detected in prior 3 months).

         10. Known active interstitial lung disease, or current (non infectious) pneumonitis or
             history of (non infectious) pneumonitis that required oral steroids.

         11. Is pregnant or breastfeeding, or expecting to conceive or father children within the
             projected duration of the trial, starting