Study of Atezolizumab Combined With Split-dose Gemcitabine Plus Cisplatin in Urothelial Carcinoma

Inclusion Criteria:

1. Male or female subjects ≥ 18 years old.
2. Written informed consent approved by the Independent Ethics Committee (IEC), prior to the performance of any trial activities.
3. Patients with histologically documented, locally advanced (T4B, any N; or any T, N2-3) or metastatic urothelial carcinoma (M1, Stage IV)\*.

   \*Also termed transitional cell carcinoma (TCC) or Urothelial Cell Carcinoma (UCC) of the urinary tract; including renal pelvis, ureters, urinary bladder, and urethra).
4. Patients should not be eligible (unfit) for full dose of cisplatin, in the investigator's judgement, based on:

   a. Age older than 70 years. b. Eastern Cooperative Oncology Group (ECOG) Performance status (PS) 2 or Karnofsky PS of 60 - 70% (only 15 patients will be included with ECOG 2). c. Measured creatinine clearance (ClCr) \> 30 and \< 60 mL/min by the Cockcroft-Gault formula (Cockcroft and Gault 1976) or by 24-hour urine collection for the determination of creatinine clearance:

   Males:

   Creatinine Clearance (CL) (mL/min) = Weight (kg) × (140 - Age) 72 x serum creatinine (mg/dL)

   Females:

   Creatinine CL (mL/min) =

   Weight (kg) × (140 - Age) ×0.85 72 x serum creatinine (mg/dL) d. Any other reason the physician considers but should specify in the Case Report Form (CRF) and discussed with the PI.
5. At least one measurable lesion through radiographic tumor evaluation (CT scan or magnetic resonance imaging/MRI) as defined by RECIST version 1.1, that has not been previously irradiated within 4 weeks prior to the study enrolment.
6. Patients with an archival or de novo tumor biopsy (representative formalin-fixed paraffin-embedded (FFPE) paraffin block obtained within 6 months prior to inclusion) with an associated pathology report, for testing of PD-L1 expression prior to study enrollment. Samples in unstained slides could be acceptable (at least 15 slides).
7. Patients with adequate normal organ and marrow function as defined below:

   1. Haemoglobin ≥ 9.0 g/dL.
   2. Absolute neutrophil count (ANC) \> 1500 per mm
   3. Platelet count ≥ 100,000 per mm
   4. Serum bilirubin ≤ 1.5 X institutional upper limit of normal (ULN) unless liver metastases are present, in which case it must be ≤ 2X ULN. This will not apply to patients with confirmed Gilbert's syndrome (persistent or recurrent hyperbilirubinemia that is predominantly unconjugated in the absence of haemolysis or hepatic pathology); however, they will be allowed only in consultation with their physician.
   5. Serum transaminases (ALT, AST and GGT) ≤ 2.5X institutional upper limit of normal unless liver metastases are present, in which case it must be ≤ 3X ULN.
8. No major active bleeding.
9. Female subjects of childbearing potential (not surgically sterile or at least 2 years postmenopausal) must provide a negative urine pregnancy test at screening, and use a medically accepted double barrier method of contraception. In addition, they must agree to continue the use of this double barrier method for the duration of the study and for 6 months after participation in the study.
10. Males should agree to abstain from sexual intercourse with a female partner or agree to use a double barrier method of contraception (i.e. condom with spermicide, in addition to having their female partner use some contraceptive measures such as oral contraceptive drugs, intrauterine device (IUD) hormonal contraception, or cervical caps), for the duration of the study and for 6 months after participation in the study
11. Willingness and ability of patients to comply with the protocol for the duration of the study including undergoing treatment as well as availability for scheduled visits and examinations including follow up.

Exclusion Criteria:

1. Prior treatment with any immune checkpoint inhibitor therapy (e.g., CTLA4, PD-1, or PD-L1 targeting agent).\*
2. Presence of active second malignancy and/or prior malignancy in the last 2 years is allowed except for the following:

   1. adequately treated basal cell or squamous cell skin cancer,
   2. adequately treated Stage I or II cancer from which the patient is currently in complete remission per investigators' clinical judgment.
3. Patient receiving radiation therapy within 4 weeks before inclusion.
4. Active or prior documented autoimmune disease within the past 2 years. Note:

   Subjects with vitiligo, Grave's disease, or psoriasis not requiring systemic treatment (within the past 2 years) are not excluded.
5. Active or prior documented inflammatory bowel disease (e.g.., Crohn's disease and ulcerative colitis).
6. History of allogeneic organ transplant.
7. Subjects having a diagnosis of immunodeficiency or are receiving systemic steroid therapy or any other form of immunosuppressive therapy within 28 days prior to the first dose of trial treatment.
8. Current or prior use of immunosuppressive medication within 7 days prior to enrolment, except the following:

   a. Intranasal, inhaled, topical steroids, or local steroid injections i. Systemic corticosteroids at physiologic doses ≤10 mg/day of prednisone or equivalent; ii. Steroids as premedication for hypersensitivity reactions
9. The subject has uncontrolled, significant intercurrent or recent illness (within 6 months prior to inclusion) including, but not limited to, the following conditions:

   a. Cardiovascular disorders: i. Class 3 or 4 congestive heart failure as defined by the New York Heart Association, unstable angina pectoris, and serious cardiac arrhythmias. ii. Uncontrolled hypertension defined as sustained blood press \> 150 mm hg systolic or \> 100 mm hg diastolic despite optimal antihypertensive treatment. iii. Stroke (including Transient Ischemic Attack (TIA)), myocardial infarction, other ischemic event, or thromboembolic event within 6 months before inclusion. Subjects with a more recent diagnosis of Deep Vein Thrombosis (DVT) are allowed if stable, asymptomatic, and treated with Low Molecular Weight Heparin (LMWH) for at least 6 weeks before study treatment.

   b. Gastrointestinal disorders (e.g., malabsorption syndrome or gastric outlet obstruction) including those associated with a high risk of perforation or fistula formulation: i. Tumours invading the GI tract, active peptic ulcer disease, inflammatory bowel disease, ulcerative colitis, diverticulitis, cholecystitis, symptomatic cholangitis or appendicitis, acute pancreatitis or acute obstruction of the pancreatic or biliary duct, or gastric outlet obstruction. ii. Abdominal fistula, GI perforation, bowel obstruction, or intra-abdominal abscess within 6 months before inclusion. Note: complete healing of an intra-abdominal abscess must be confirmed prior to start of the treatment.

   c. Clinically significant hematemesis or hemoptysis of \> 0.5 teaspoon (\> 2.5 ml) of red blood or history of other significant bleeding within 3 months before treatment.

   d. Cavitating pulmonary lesion(s) or known endobronchial disease manifestation.

   e. Lesions invading major pulmonary blood vessels.

   f. Other clinically significant disorders such as: i. Active infection requiring systemic treatment, infection with human immunodeficiency virus or acquired immunodeficiency syndrome-related illness, or chronic hepatitis B or C infection.

   ii. Serious non-healing wound/ulcer/bone fracture. iii. Malabsorption syndrome. iv. Moderate to severe hepatic impairment (child-pugh B or C). v. Requirement for hemodialysis or peritoneal dialysis. vi. Uncontrolled diabetes mellitus.
10. Major surgery (e.g., GI surgery and removal or biopsy of brain metastasis) within 8 weeks before inclusion. Complete wound healing from major surgery must have occurred 4 weeks before study treatment and from minor surgery at least 10 days before study treatment. Subjects with clinically relevant ongoing complications from prior surgery are not eligible.
11. Known human immunodeficiency virus (HIV) or acquired immunodeficiency syndrome (AIDS)-related illness.
12. Any test for hepatitis B virus (HBV) or hepatitis C virus (HCV) indicating acute or chronic infection.
13. Women who are pregnant or are breastfeeding.
14. Male patients must be surgically sterile or must agree to use effective contraception during the period of therapy.
15. Any of the following within 6 months prior to study entry: myocardial infarction, uncontrolled angina, uncontrolled hypertension, coronary/peripheral artery bypass graft, symptomatic congestive heart failure, cerebrovascular accident or transient ischemic attack.
16. Previously identified allergy or hypersensitivity to components of the study treatment formulations.