Cisplatin and Gemcitabine Hydrochloride With or Without ATR Kinase Inhibitor M6620 in Treating Patients With Metastatic Urothelial Cancer

PRIMARY OBJECTIVES:

I. To determine if the addition of ATR kinase inhibitor M6620 (M6620 [VX-970]) to
cisplatin/gemcitabine hydrochloride (gemcitabine) improves progression-free survival (PFS)
relative to cisplatin/gemcitabine alone.

SECONDARY OBJECTIVES:

I. To compare overall survival (OS) with the addition of M6620 (VX-970) to
cisplatin/gemcitabine relative to cisplatin/gemcitabine alone.

II. To compare tumor response rate with the addition of M6620 (VX-970) to
cisplatin/gemcitabine relative to cisplatin/gemcitabine alone.

III. To compare safety with the addition of M6620 (VX-970) to cisplatin/gemcitabine relative
to cisplatin/gemcitabine alone.

IV. To assess the role of p53 status in predicting response to M6620 (VX-970)-based therapy.

OUTLINE: Patients are randomized to 1 of 2 arms.

ARM A: Patients receive gemcitabine hydrochloride intravenously (IV) over 30 minutes on days
1 and 8, and cisplatin IV over 60 minutes on day 1. Patients also receive ATR kinase
inhibitor M6620 IV over 60 minutes on days 2 and 9. Treatment repeats every 21 days for 6
courses in the absence of disease progression or unacceptable toxicity.

ARM B: Patients receive gemcitabine hydrochloride and cisplatin as in Arm A.

After completion of study treatment, patients are followed up to 36 months.

Inclusion Criteria:

- Patients must have histologically or cytologically confirmed metastatic urothelial
carcinoma; urothelial cancer derived from the bladder, ureter or upper tract is
permitted

- Patients must have measurable disease, defined as at least one lesion that can be
accurately measured in at least one dimension (longest diameter to be recorded for
non-nodal lesions and short axis for nodal lesions) as >= 20 mm (>= 2 cm) with
conventional techniques or as >= 10 mm (>= 1 cm) with spiral computed tomography (CT)
scan, magnetic resonance imaging (MRI), or calipers by clinical exam

- Patients must have access to archival tumor tissue for proposed correlative studies;
these may be derived from transurethral resection of bladder tumors (TURBT),
cystectomy, or biopsy; if archival tissue is not available for proposed correlatives,
patients may be enrolled at the discretion of the study principal investigator (PI)
(SKP)

- No prior cytotoxic chemotherapy for metastatic disease; prior immunotherapy is
permitted

- At least 12 months have elapsed since platinum-based peri-operative treatment

- Karnofsky >= 70% (Eastern Cooperative Oncology Group [ECOG] performance status 0-1)

- Life expectancy of greater than 3 months

- Leukocytes >= 3,000/mcL

- Absolute neutrophil count >= 1,500/mcL

- Platelets >= 100,000/mcL

- Total bilirubin within institutional upper limit of normal

- Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase
[SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT])
=< 2.5 x institutional upper limit of normal

- Creatinine clearance >= 50 mL/min by either measured (using the Cockcroft-Gault,
Modification of Diet in Renal Disease [MDRD] or Chronic Kidney Disease Epidemiology
[CKD-EPI] formula) or calculated clearance (i.e. glomerular filtration rate [GFR])

- Women of child-bearing potential and men must agree to use adequate contraception
(hormonal or barrier method of birth control; abstinence) prior to study entry and for
the duration of study participation; should a woman become pregnant or suspect she is
pregnant while she or her partner is participating in this study, she should inform
her treating physician immediately; men treated or enrolled on this protocol must also
agree to use adequate contraception prior to the study, for the duration of study
participation, and 6 months after completion of M6620 (VX-970) administration

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

Exclusion Criteria:

- Radiotherapy within 4 weeks of protocol therapy

- Patients who are receiving any other investigational agents

- History of allergic reactions attributed to compounds of similar chemical or biologic
composition to M6620 (VX970), cisplatin, or gemcitabine

- Concomitant administration with strong inhibitors or inducers of CYP3A4 should be
avoided; it is important to regularly consult a frequently-updated medical reference
for a list of drugs to avoid or minimize use of

- Uncontrolled intercurrent illness including, but not limited to, ongoing or active
infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac
arrhythmia, or psychiatric illness/social situations that would limit compliance with
study requirements

- Pregnant women are excluded from this study; breastfeeding should be discontinued if
the mother is treated with M6620 (VX970); these potential risks may also apply to
other agents used in this study

- Patients with >= grade 2 neuropathy