Radiation Therapy and Durvalumab With or Without Tremelimumab in Treating Participants With Unresectable, Locally Advanced, or Metastatic Bladder Cancer

PRIMARY OBJECTIVES:

I. To determine the safety profile of radiation therapy (RT) and durvalumab with or without
tremelimumab. (Safety lead-in cohort) II. To determine the median progression-free survival
with RT and durvalumab with or without tremelimumab. (Expansion cohort)

SECONDARY OBJECTIVES:

I. To assess the efficacy of RT and durvalumab with or without tremelimumab in terms of local
control of irradiated bladder tumor.

II. To assess the efficacy of RT and durvalumab with or without tremelimumab in terms of
pathologic complete response (CR) rate of irradiated bladder tumor.

III. To assess the efficacy of RT and durvalumab with or without tremelimumab in terms
overall response rate.

IV. To assess the efficacy of RT and durvalumab with or without tremelimumab in terms of
abscopal response rate.

V. To assess the efficacy of RT and durvalumab with or without tremelimumab in terms of
duration of response.

VI. To assess the efficacy of RT and durvalumab with or without tremelimumab in terms of
disease specific survival.

VII. To assess the efficacy of RT and durvalumab with or without tremelimumab in terms of
overall survival.

VIII. To further determine the safety and tolerability of RT + durvalumab with or without
tremelimumab (expansion cohorts).

EXPLORATORY OBJECTIVES:

I. To explore the immunologic changes associated with the combination of durvalumab and RT
+/- tremelimumab.

OUTLINE: Participants are randomized to 1 of 2 regimens.

REGIMEN A: Participants receive durvalumab intravenously (IV) over 60 minutes on day 1.
Treatment repeats every 28 days for up to 13 courses in the absence of disease progression or
unacceptable toxicity. Participants also undergo external beam radiation therapy (EBRT) for 5
fractions beginning on day 8 of course 1.

REGIMEN B:

Participants receive tremelimumab IV over 60 minutes on day 1 for up to 2 courses and
durvalumab IV over 60 minutes on day 1. Treatment repeats every 28 days for up to 13 courses
in the absence of disease progression of unacceptable toxicity. Participants also receive
undergo EBRT for 5 fractions beginning on day 8 of course 1.

After completion of study treatment, participants are followed up at 8 weeks and then every
12 and 16 weeks.

Inclusion Criteria:

- Written informed consent obtained from the patient/legal representative prior to
performing any protocol-related procedures, including screening evaluations.

- cT2 - T4 or metastatic (N+ or M+) urothelial bladder cancer. Mixed histologies with
predominant urothelial pattern are allowed. Patients with localized disease must
either refuse cystectomy or be deemed not ideal cystectomy candidates.

- If metastatic disease present patients must have an intact, symptomatic bladder tumor,
appropriate for palliative RT to the bladder.

- Measurable metastatic disease according to Response Evaluation Criteria in Solid
Tumors (RECIST) version (v)1.1 criteria. Thus, patients with metastatic disease must
have at least 1 lesion, not previously irradiated, that can be accurately measured at
baseline as >= 10 mm in the longest diameter (except lymph nodes which must have a
short axis >= 15 mm) with computed tomography (CT) or magnetic resonance imaging (MRI)
and that is suitable for accurate repeated measurement as per RECIST v1.1 guidelines.

- Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1/

- Life expectancy of >= 12 weeks.

- Patients must be ineligible for or refuse cisplatin-based chemotherapy. Cisplatin
ineligibility is defined as meeting 1 of the following criteria:

- Creatinine clearance (calculated or measured) < 60 mL/min

- Common Terminology Criteria for Adverse Events (CTCAE) grade >= 2 audiometric
hearing loss

- CTCAE grade 2 or higher peripheral neuropathy

- New York Heart Association class III heart failure

- Any other criteria deemed by the investigator to make the patient unsuitable for
cisplatin-based chemotherapy

- Note: The reason for cisplatin ineligibility must be documented. Patients
may refuse cisplatin-based chemotherapy after an informed discussion of the
risks and benefits, and the reason for refusal must be documented.

- Subjects must consent to provide an archived tumor specimen from within 12 months
prior to study entry (ie, from subject signing consent to participate in the study)
for immunologic characterization. If not available, subjects should have at least 1
lesion amenable to biopsy and consent to provide a pre-treatment fresh biopsy. Tumor
lesions used for biopsy should not be lesions used as target lesions. Additional
archival tissue from beyond 12 months prior to study entry is also requested, if
available, to support exploratory analyses.

- Hemoglobin >= 9.0 g/dL

- Absolute neutrophil count (ANC) >= 1.5 x 10^9/L (>= 1500 per mm^3)

- Platelet count >= 100 x 10^9/L (>= 100,000 per mm^3)

- Serum bilirubin =< 1.5 x institutional upper limit of normal (ULN). This will not
apply to subjects with confirmed Gilbert?s syndrome (persistent or recurrent
hyperbilirubinemia that is predominantly unconjugated in the absence of hemolysis or
hepatic pathology), who will be allowed only in consultation with their physician.

- Aspartate aminotransferase (AST) (serum glutamic-oxaloacetic transaminase
[SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT])
=< 2.5 x institutional upper limit of normal unless liver metastases are present, in
which case it must be =< 5 x ULN

- Serum creatinine clearance (CL) > 30 mL/min by the Cockcroft-Gault formula or by
24-hour urine collection for determination of creatinine clearance.

- Female subjects must either be of non-reproductive potential (ie, post-menopausal by
history: >= 60 years old and no menses for 1 year without an alternative medical
cause; OR history of hysterectomy, OR history of bilateral tubal ligation, OR history
of bilateral oophorectomy) or must have a negative serum pregnancy test upon study
entry. Evidence of post-menopausal status or negative urinary or serum pregnancy test
for female pre-menopausal patients. Women will be considered post-menopausal if they
have been amenorrheic for 12 months without an alternative medical cause. The
following age-specific requirements apply:

- Women < 50 years of age would be considered post-menopausal if they have been
amenorrheic for 12 months or more following cessation of exogenous hormonal
treatments and if they have luteinizing hormone and follicle-stimulating hormone
levels in the post-menopausal range for the institution or underwent surgical
sterilization (bilateral oophorectomy or hysterectomy).

- Women >= 50 years of age would be considered post-menopausal if they have been
amenorrheic for 12 months or more following cessation of all exogenous hormonal
treatments, had radiation-induced menopause with last menses > 1 year ago, had
chemotherapy-induced menopause with last menses > 1 year ago, or underwent
surgical sterilization (bilateral oophorectomy, bilateral salpingectomy or
hysterectomy)

- Subject is willing and able to comply with the protocol for the duration of the study
including undergoing treatment and scheduled visit and examinations and follow-up.

Exclusion Criteria:

- ECOG PS 2 or higher.

- Prior cystectomy or definitive RT to the bladder.

- History of autoimmune disease, including, but not limited to myasthenia gravis,
myositis, autoimmune hepatitis, systemic lupus erythematosus, rheumatoid arthritis,
inflammatory bowel disease, vascular thrombosis associated with antiphospholipid
syndrome, Wegner?s granulomatosis, Sjogren?s syndrome, Guillain-Barre syndrome,
multiple sclerosis, vasculitis, or glomerulonephritis.

- Active or prior documented autoimmune or inflammatory disorders (including
inflammatory bowel disease [eg, colitis or Crohn's disease], diverticulitis [with the
exception of diverticulosis], celiac disease, systemic lupus erythematosus,
Sarcoidosis syndrome, or Wegener syndrome [granulomatosis with polyangiitis, Graves'
disease, rheumatoid arthritis, hypophysitis, uveitis, etc]). The following are
exceptions to this criterion:

- Subjects with childhood atopy or asthma, vitiligo, alopecia, Hashimoto syndrome,
Grave?s disease, or psoriasis not requiring systemic treatment (within the past 2
years) are not excluded.

- Patients with a history of autoimmune-related hypothyroidism on a stable dose of
thyroid replacement hormone are not excluded.

- Patients with controlled type 1 diabetes mellitus on a stable dose of insulin
regimen are not excluded.

- Any chronic skin condition that does not require systemic therapy are not
excluded.

- Patients without active autoimmune disease in the last 5 years may be included
after consultation with the study physician.

- Patients with human immunodeficiency virus (HIV), active hepatitis B (HBV) or active
hepatitis C (HCV)

- Patients with past HBV infection or resolved HBV infection, defined as the
presence of hepatitis B core antibody (HBc Ab) and absence of hepatitis B surface
antigen (HBsAg) are eligible. HBV deoxyribonucleic acid (DNA) must be obtained in
these patients prior to day 1 of therapy, but detection of HBV DNA in these
patients will not exclude study participation.

- Patients positive for HCV antibody are eligible only if polymerase chain reaction
is negative for HCV ribonucleic acid (RNA).

- History of idiopathic pulmonary fibrosis, organizing pneumonia (e.g., bronchiolitis
obliterans), drug-induced pneumonitis, idiopathic pneumonitis, or evidence of active
pneumonitis on screening chest CT scan.

- Involvement in the planning and/or conduct of the study (applies to both AstraZeneca
staff and/or staff at the study site).

- Previous investigational product (IP) assignment in the present study.

- Current enrollment/participation in another clinical study, unless it is an
observational (noninterventional) clinical study or during the follow-up period of an
interventional study.

- Prior radiation therapy to the abdomen or pelvis, including radiation therapy to the
bladder, prostate, or rectum.

- Any concurrent systemic chemotherapy, biologic, or hormonal therapy for cancer
treatment. Concurrent use of hormonal therapy for non-cancer related conditions (i.e.
hormonal replacement therapy) is acceptable. Prior systemic therapies are allowed with
a washout period of >= 45 days.

- Major surgical procedure (as defined by the investigator) within 28 days prior to the
first dose of IP. Note biopsy and transurethral resection of the bladder tumor (TURBT)
of the primary tumor is acceptable.

- History of another primary malignancy except for:

- Malignancy treated with curative intent and with no known active disease >= 3
years before the first dose of study drug and of low potential risk for
recurrence.

- Adequately treated non-melanoma skin cancer or lentigo maligna without evidence
of disease.

- Adequately treated carcinoma in situ without evidence of disease eg, cervical
cancer in situ >> (Optional criteria that are dependent on the patient population
under investigation.)

- Note: Patients with incidental finding of early stage prostate cancer will
not be eligible.

- QT interval corrected for heart rate using Fridericia?s formula (QTcF) >= 470 ms
calculated. Any clinically significant abnormalities detected require triplicate
electrocardiography (ECG) results and a mean QT interval corrected for heart rate
using Fridericia?s formula (QTcF) >= 470 ms calculated from 3 ECGs).

- Current or prior use of immunosuppressive medication within 14 days before the first
dose of durvalumab or tremelimumab, with the exceptions of intranasal and inhaled
corticosteroids or systemic corticosteroids at physiological doses, which are not to
exceed 10 mg/day of prednisone, or an equivalent corticosteroid.

- History of primary immunodeficiency.

- History of allogeneic organ transplant.

- History of hypersensitivity to durvalumab, tremelimumab, or any excipient.

- History of hypersensitivity to the combination therapy of durvalumab and tremelimumab.

- Uncontrolled intercurrent illness including, but not limited to, ongoing or active
infection, symptomatic congestive heart failure, uncontrolled hypertension, unstable
angina pectoris, cardiac arrhythmia, active peptic ulcer disease or gastritis, active
bleeding diatheses including any subject known to have evidence of acute or chronic
hepatitis B, hepatitis C or human immunodeficiency virus (HIV), or psychiatric
illness/social situations that would limit compliance with study requirements or
compromise the ability of the subject to give written informed consent.

- Active infection including tuberculosis (clinical evaluation that includes clinical
history, physical examination, and radiographic findings, and tuberculosis [TB]
testing in line with local practice).

- History of leptomeningeal carcinomatosis.

- Receipt of live attenuated vaccination within 30 days prior to study entry or within
30 days of receiving durvalumab or tremelimumab.

- Any condition that, in the opinion of the investigator, would interfere with
evaluation of study treatment or interpretation of patient safety or study results.

- Brain metastases or spinal cord compression unless the patient?s condition is stable
(asymptomatic, no evidence of new or emerging brain metastases) and off steroids for
at least 14 days prior to the start of study treatment. Following radiotherapy and/or
surgery, patients with suspected brain metastases at screening should have a magnetic
resonance imaging (MRI)(preferred)/CT, preferably with IV contrast.

- Subjects with uncontrolled seizures.

- Female patients who are pregnant or breastfeeding or male or female patients of
reproductive potential who are not willing to employ effective birth control from
screening to 180 days after the last dose of durvalumab + tremelimumab combination
therapy or 90 days after the last dose of durvalumab monotherapy, whichever is the
longer time period.