•Patients must meet all SCREENING/PRE-SCREENING and SUB-STUDY REGISTRATION COMMON
        ELIGIBILITY CRITERIA as specified in S1400: A BIOMARKER-DRIVEN MASTER PROTOCOL FOR
        PREVIOUSLY TREATED SQUAMOUS CELL LUNG CANCER 5.1 Sub-Study Specific Disease Related
        Criteria

          1. Patients must have been assigned to S1400I.

          2. Patients must not have had prior treatment with an anti-PD-1, anti-PD-L1, anti-PD-L2,
             anti-CTLA-4 antibody, or any other antibody or drug specifically targeting T-cell
             costimulation or immune checkpoint pathways.

          3. Patients must not have an active, known, or suspected autoimmune disease. Patients are
             permitted to enroll if they have vitiligo, type I diabetes mellitus, hypothyroidism
             only requiring hormone replacement, psoriasis not requiring systemic treatment, or
             conditions not expected to recur in the absence of an external trigger.

        5.2 Sub-Study Specific Clinical/Laboratory Criteria

          1. Patients must not have any known allergy or reaction to any component of the nivolumab
             and ipilimumab formulations.

          2. Patients must not have received systemic treatment with corticosteroids (> 10 mg daily
             prednisone or equivalent) or other immunosuppressive medications within 14 days prior
             to sub-study registration. Inhaled or topical steroids, and adrenal replacement doses
             <= 10 mg daily prednisone or equivalent are permitted in the absence of active
             autoimmune disease.

          3. Patients must not have a known positive test for hepatitis B virus surface antigen
             (HBV sAg) or hepatitis C virus ribonucleic acid (HCV antibody) indicating acute or
             chronic infection. Patients with a positive hepatitis C antibody with a negative viral
             load are allowed. [This criterion replaces common eligibility criteria in Section
             5.3m.]

          4. Patients must not have known history of testing positive for human immunodeficiency
             virus (HIV) or known acquired immunodeficiency syndrome (AIDS). [This criterion
             replaces common eligibility criteria in Section 5.3n.]

          5. Patients must not have interstitial lung disease that is symptomatic or disease that
             may interfere with the detection or management of suspected drug-related pulmonary
             toxicity.

          6. Patients must also be offered participation in banking for future use of specimens as
             described in Section 15.0.

          7. Patients must have a Lipase, Amylase, TSH with reflex Free T3/T4 performed within 7
             days prior to sub-study registration. Additional timepoints are noted in Section 9.0,
             Study Calendar. [Note: For the Canadian sites, testing for lipase only is acceptable.]

          8. Patients must not have any Grade III/IV cardiac disease as defined by the New York
             Heart Association Criteria (i.e., patients with cardiac disease resulting in marked
             limitation of physical activity or resulting in inability to carry on any physical
             activity without discomfort), unstable angina pectoris, and myocardial infarction
             within 6 months, or serious uncontrolled cardiac arrhythmia (see Section 18.1b).

               1. Patients with a history of congestive heart failure (CHF) or at risk because of
                  underlying cardiovascular disease or exposure to cardiotoxic drug should have an
                  EKG and echocardiogram performed to evaluate cardiac function as clinically
                  indicated.

               2. Patients with evidence of congestive heart failure (CHF), myocardial infarction
                  (MI), cardiomyopathy, or myositis should have a cardiac evaluation including lab
                  tests and cardiology consultations as clinically indicated including EKG, CPK,
                  troponin, and echocardiogram.

          9. Patients who can complete PRO forms in English are required to complete a pre-study
             S1400I Patient Reported Outcomes (PRO) Questionnaire and a pre-study S1400I EQ-5D
             Questionnaire within 14 days prior to registration (see Section 18.2 of S1400I). NOTE:
             Patients enrolled to S1400I prior to 9/1/2016 are not eligible for the PRO study.