Inclusion Criteria:

          1. Age ≥18 years at the time of informed consent and have provided signed informed
             consent for the trial.

          2. Willing and able to comply with all aspects of the protocol.

          3. Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1.

          4. Life expectancy ≥3 months.

          5. Diagnosed with histologically confirmed locally advanced and nonresectable, or
             metastatic disease.

          6. Have received at least one line of prior systemic therapy or no alternative therapy to
             prolong survival exists.

          7. Have received no more than 4 prior lines of systemic therapy for advanced disease.
             Prior therapy in an adjuvant or neoadjuvant setting is not considered as a prior line
             of systemic therapy.

          8. Have measurable disease per RECIST 1.1 as assessed by the local site investigator
             and/or radiologist. Lesions situated in a previously irradiated area are considered
             measurable if progression has been demonstrated in such lesions.

          9. Have provided archival tumor tissue sample or newly obtained core or excisional biopsy
             of a tumor lesion not previously irradiated. If previously treated with
             anti-PD-1/PD-L1 therapy, tumor tissue sample obtained following the most recent
             anti-PD-1/PD-L1 therapy is required. Formalin-fixed, paraffin embedded (FFPE) tissue
             blocks are preferred to slides. Newly obtained biopsies are preferred to archived
             tissue.

         10. Left ventricular ejection fraction (LVEF) greater than 50% on echocardiography or
             multiple gated acquisition (MUGA) scan.

         11. Patient has organ function as shown by the following:

               1. Absolute neutrophil count (ANC) ≥1.5 x 109/L.

               2. Hemoglobin ≥9 g/dL (which may be reached by transfusion 2 weeks prior to the
                  start of the study treatment).

               3. Platelets ≥100 x 109/L (which may be reached by transfusion).

               4. International normalized ratio (INR) ≤1.5.

               5. Calcium (corrected for serum albumin) within normal limits (WNL) or ≤ grade 1
                  severity according to NCI-CTCAE version 5.0 if judged clinically not significant
                  by the Investigator. Patients concomitantly taking bisphosphonates or denosumab
                  for calcium correction are eligible. (only applicable to Observations I and III)

               6. Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤3.0 x upper
                  limit of normal (ULN) or <5.0 x ULN if liver metastases are present.

               7. Total serum bilirubin ≤ ULN or ≤1.5 x ULN if liver metastases are present; or
                  total bilirubin ≤3.0 x ULN with direct bilirubin below or within normal range in
                  patients with well documented Gilbert's Syndrome. Gilbert's syndrome is defined
                  as presence of episodes of unconjugated hyperbilirubinemia with normal results
                  from cells blood count (including normal reticulocyte count and blood smear),
                  normal liver function test results, and absence of other contributing disease
                  processes at the time of diagnosis.

               8. Serum creatinine ≤1.5 x ULN or calculated or directly measured creatinine
                  clearance (CrCL) >30 mL/min.

               9. HbA1c ≤8%. (Only applicable to Observations I and III)

         12. 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 Women are considered post-menopausal and
                  not of child-bearing potential if they have had 12 months of natural
                  (spontaneous) amenorrhea with an appropriate clinical profile (e.g., age
                  appropriate, history of vasomotor symptoms) or have had surgical bilateral
                  oophorectomy (with or without hysterectomy) at least six weeks prior to
                  Screening. In the case of oophorectomy alone, only when the reproductive status
                  of the woman has been confirmed by follow-up hormone level assessment, is she
                  considered not of child-bearing potential.

               2. Woman of childbearing potential who agrees to follow contraceptive guidance
                  during the treatment period and for at least 5 months after the last dose of
                  Atezolizumab.

             Highly effective contraception is defined as either:

               -  Total abstinence: When this is in line with the preferred and usual lifestyle of
                  the patient. (Periodic abstinence [e.g., calendar, ovulation, symptothermal,
                  post-ovulation methods] and withdrawal are not acceptable methods of
                  contraception.)

               -  Female sterilization: When the female study patient has had surgical bilateral
                  oophorectomy (with or without hysterectomy) or tubal ligation at least six weeks
                  before taking study treatment. In case of oophorectomy alone, only when the
                  reproductive status of the woman has been confirmed by follow-up hormone level
                  assessment.

               -  Male partner sterilization (with the appropriate post-vasectomy documentation of
                  the absence of sperm in the ejaculate). For female study patients, the
                  vasectomized male partner should be the sole partner for that patient.

               -  Using a combination of any two of the following:

                    -  Placement of an intrauterine device (IUD) or intrauterine system (IUS), and

                    -  Barrier methods of contraception: condom or occlusive cap (diaphragm or
                       cervical/vault caps) with spermicidal foam/gel/film/cream/vaginal
                       suppository.

                    -  Hormonal contraception methods (e.g., oral, injected, implanted).

         13. A male participant must agree to use contraception during the treatment period and for
             at least 5 months after the last dose of Atezolizumab.

        Exclusion Criteria:

          1. Have been discontinued treatment due to a Grade 3 or higher immune-related AE (irAE)
             from prior anti-PD-1or anti-PD-L1, or with an agent directed to another stimulatory or
             co-inhibitory T-cell receptor (eg, CTLA-4, OX 40, CD137).

          2. Have received prior systemic anti-cancer therapy including investigational agents
             within 4 weeks or 5 half-lives, whichever is shorter.

             Note: Participants must have recovered from all AEs due to previous therapies to ≤
             Grade 1 or returned to baseline. Participants with ≤ Grade 2 neuropathy or alopecia
             may be eligible.

          3. Have received prior palliative radiotherapy within 2 weeks of start of study
             treatment. Participants must have recovered from all radiation-related toxicities, not
             require corticosteroids, and not have had radiation pneumonitis. A 1-week washout is
             permitted for palliative radiation (≤ 2 weeks of radiotherapy) to non-central nervous
             system (CNS) disease.

          4. Severe, uncontrolled tumor-related pain.

          5. Have received a live vaccine within 30 days prior to the first dose of study drug.
             Examples of live vaccines include, but are not limited to, the following: measles,
             mumps, rubella, varicella/zoster (chicken pox), yellow fever, rabies, Bacillus
             Calmette-Guérin (BCG), and typhoid vaccine. Seasonal influenza vaccines for injection
             are generally killed virus vaccines and are allowed; however, intranasal influenza
             vaccines (e.g., FluMist®) are live attenuated vaccines and are not allowed. Non live
             COVID vaccinations or boosters should not occur during Cycle 1 or within 30 days prior
             to the first dose of study drug.

          6. Are currently participating in a study of an investigational agent or have used an
             investigational device within 4 weeks prior to the first dose of study treatment.

             Note: Participants who have entered the follow-up phase of an investigational study
             may participate as long as it has been at least 4 weeks after the last dose of the
             previous investigational agent (see Number 2 above).

          7. Have had an allogenic tissue/solid organ transplant.

          8. Have a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy
             (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of
             immunosuppressive therapy within 7 days prior the first dose of study drug.

          9. With a history of another primary malignancy within the past 2 years, with the
             exception of basal or squamous cell skin cancer, or carcinoma in situ of the cervix or
             breast that has undergone potentially curative therapy.

         10. Have known active CNS metastases and/or carcinomatous meningitis. Participants with
             previously treated brain metastases may participate provided they are radiologically
             stable, i.e., without evidence of progression for at least 4 weeks by repeat imaging
             (note that the repeat imaging should be performed during study screening), clinically
             stable and without requirement of steroid treatment for at least 14 days prior to
             first dose of study treatment.

         11. Have known severe hypersensitivity to study treatment components.

         12. Have an active autoimmune disease that has required systemic treatment in the past 2
             years (i.e., with use of disease modifying agents, corticosteroids or
             immunosuppressive drugs). Replacement therapy (e.g., thyroxine, insulin, or
             physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency)
             is not considered a form of systemic treatment and is allowed. Have a history of
             (non-infectious) pneumonitis that required steroids or have current pneumonitis.

         13. Have a history of (non-infectious) pneumonitis that required steroids or have current
             pneumonitis.

         14. Have an active infection requiring systemic therapy within 2 weeks prior to Day 1 of
             Cycle 1.

         15. Participants with known human immunodeficiency virus (HIV) and/or history of Hepatitis
             B or C infections, or known to be positive for Hepatitis B antigen (HBsAg)/ Hepatitis
             B virus (HBV) DNA or Hepatitis C Antibody or RNA. Active Hepatitis C is defined by a
             known positive Hep C Ab result and known quantitative HCV RNA results greater than the
             lower limits of detection of the assay.

         16. Significant cardiovascular impairment: history of congestive heart failure greater
             than New York Heart Association (NYHA) Class II, uncontrolled arterial hypertension,
             unstable angina, myocardial infarction, or stroke within 6 months of the first dose of
             study drug; or cardiac arrhythmia requiring medical treatment (including oral
             anticoagulation).

         17. Major surgery within 4 weeks before the first dose of study drug. Note: If participant
             received major surgery, they must have recovered adequately from surgery and the
             toxicity and/or complications requiring the intervention prior to starting study
             treatment.

         18. Inability to take oral medication, or malabsorption syndrome or any other uncontrolled
             gastrointestinal condition (e.g., nausea, diarrhea, or vomiting) that might impair the
             oral bioavailability of the investigational drugs.

         19. Have a history or current evidence of any condition, therapy, or laboratory
             abnormality that might confound the results of the study, interfere with the
             participant's participation for the full duration of the study, or is not in the best
             interest of the participant to participate, in the opinion of the treating
             investigator.

         20. Have a known psychiatric or substance abuse disorder that would interfere with the
             participant's ability to cooperate with the requirements of the study, e.g. history of
             or active major depressive episode, bipolar disorder, obsessive-compulsive disorder,
             schizophrenia, or history of suicidal attempt or ideation, homicidal ideation (e.g.,
             risk of doing harm to self or others), or patients with active severe personality
             disorders (defined according to Diagnostic and Statistical Manual of Mental Disorders
             [DSM V]) are not eligible. Note: For patients with psychotropic treatments ongoing at
             baseline, the dose and the schedule should not be modified within the previous six
             weeks prior to start of study drug.

         21. Is pregnant or breastfeeding or expecting to conceive or father children within the
             projected duration of the study, starting with the screening visit through 5 months
             after the last dose of Atezolizumab.

         22. Uncontrolled pleural effusion, pericardial effusion, or ascites requiring recurrent
             drainage procedures >/=1 time per month.

         23. Leptomeningeal disease.

         24. Spinal cord compression not definitively treated with surgery and/or radiation, or
             previously diagnosed and treated but without evidence that disease has been clinically
             stable for >/=2 weeks prior to Day 1 of Cycle 1.

         25. Oral or IV antibiotics within 2 weeks prior to Day 1 of Cycle 1 for an active
             infection (prophylactic antibiotic dosing that is deemed to be essential by the
             investigator is allowed).

         26. History of severe allergic, anaphylactic, or other hypersensitivity reactions to
             chimeric or humanized antibodies or fusion proteins.

         27. Known hypersensitivity or allergy to biopharmaceuticals produced in Chinese hamster
             ovary cells or to any component of the atezolizumab formulation.

         28. Active tuberculosis.

         29. Patient has received previous treatment with any protein kinase B (PKB/AKT), mammalian
             target of rapamycin (mTOR) inhibitors, or phosphatidylinositol 3 kinase (PI3K) pathway
             inhibitors (only applicable to Observations I and III).

         30. Patient has grade ≥2 neuropathy, colitis, pneumonitis, elevated HbA1C, and
             uncontrolled endocrinopathies (e.g., hypothyroidism) from previous treatment (only
             applicable to Observations I and III).

         31. Have clinically manifest diabetes mellitus (DM) (treated and/or with clinical signs)
             that is not well controlled (only applicable to Observations I and III).

         32. Patient is currently receiving warfarin or other coumarin-derived anti-coagulant, or
             anti-Xa agents, for treatment, prophylaxis, or otherwise. Therapy with heparin, low
             molecular weight heparin (LMWH), fondaparinux or novel oral anticoagulants (NOACs) is
             allowed.

         33. Have diarrhea ≥2 CTCAE Grade 2 (only applicable to Observations I and III).

         34. Patient is currently being treated with drugs known to be moderate and strong
             inhibitors or inducers of isoenzyme CYP3A4, and the treatment cannot be discontinued
             or switched to a different medication prior to starting study drug (only applicable to
             Observations I and III). UGT inducers or inhibitors such as atazanavir, probenecid,
             valproic acid, mefenamic acid, quinidine (only applicable to Observation II).

         35. Patient has a history of non-compliance to any medical regimen or inability to grant
             consent.

         36. Patient that is currently receiving NSAIDs.

         37. Patient that is currently receiving angiotensin converting enzyme (ACE) inhibitors and
             angiotensin II receptor blockers (ARBs): Patients on these hypertensives at study
             entry should be switched to other hypertensives prior to study drug dosing.