Duration of Immune Checkpoint Therapy in Locally Advanced or Metastatic Urothelial Carcinoma: A Randomized Phase 3 Non-Inferiority Trial (IMAGINE)
Duration of Immune Checkpoint Therapy in Locally Advanced or Metastatic Urothelial Carcinoma: A Randomized Phase 3 Non-Inferiority Trial (IMAGINE)
This phase III trial compares survival in urothelial cancer patients who stop immune checkpoint inhibitor treatment after being treated for about a year to those patients who continue treatment with immune checkpoint inhibitors. Immunotherapy with monoclonal antibodies, such as avelumab, durvalumab, pembrolizumab, atezolizumab, and nivolumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Stopping immune checkpoint inhibitors early may still make the tumor shrink and patients may have similar survival rates as the patients who continue treatment. Stopping treatment early may also lead to fewer treatment-related side effects, an improvement in mental health, and a lower cost burden to patients.
PRIMARY OBJECTIVE:
I. To compare overall survival (OS).
SECONDARY OBJECTIVES:
I. To compare progression free survival (PFS) by (Response Evaluation Criteria in Solid Tumors) RECIST 1.1 criteria.
II. To compare PFS by immune-related (ir)RECIST criteria. III. To determine treatment-free interval (TFI) after immune checkpoint inhibitor (ICI) discontinuation. (Arm B) IV. To determine the rate of response by RECIST 1.1 criteria after ICI rechallenge. (Arm B) V. To assess adverse events in each study arm by Common Terminology Criteria for Adverse Events (CTCAE) 5.0.
OUTLINE: Patient are randomized to 1 of 2 arms.
ARM A (CONTINUATION OF ICI TREATMENT): Patients receive either pembrolizumab intravenously (IV) over 30 minutes on day 1, nivolumab IV over 30 minutes on days 1 and 15, atezolizumab IV over 30-60 minutes on day 1, durvalumab IV over 60 minutes on days 1 and 15, or avelumab IV over 60 minutes on days 1 and 15. Cycles repeat every 21 or 42 days for pembrolizumab, every 21 days for atezolizumab, and 28 days for nivolumab, durvalumab, and avelumab in the absence of disease progression or unacceptable toxicity.
After completion of study treatment, starting new treatment or withdrawn consent, patients are followed up at 4 weeks, and then every 6 months for 5 years following registration.
ARM B (DISCONTINUATION OF ICI TREATMENT): Patients receiving ICI treatment will discontinue ICI treatment within 1 cycle length after randomization. Cycle length is determined by the ICI regimen the patient is receiving at randomization. At disease progression patients may restart the same ICI treatment they were receiving upon randomization at physician discretion.
After completion of study treatment, patients are followed up at 4 weeks, and then every 6 months for 5 years following registration.
Documentation of disease
Patients must have received at least one cycle of current active treatment with standard of care (SOC) Food and Drug Administration (FDA) approved PD-1/L1 immune checkpoint inhibitor (ICI)-containing therapy for locally advance or metastatic UC
Patients without progressive disease per Response Evaluation Criteria in Solid Tumors (RECIST) version (v) 1.1 guidelines (i.e., with an ongoing [complete response] CR, partial response [PR], or stable disease [SD]) following completion of 12-15 months of ICI treatment
No history of tuberculosis, active hepatitis B (HBV) or hepatitis C (HCV), or uncontrolled human immunodeficiency virus (HIV)
No history of allogeneic organ transplantation
No current immunosuppressive medication exceeding 10 mg/day of prednisone or its equivalent
* Patients with pre-existing or treatment-emergent autoimmune or inflammatory disorders which do not require systemic immunosuppressive treatment exceeding 10 mg/day of prednisone or its equivalent may be included
No history of another primary malignancy except for malignancy treated with curative intent with no known active disease for >= 2 years, and adequately treated non-melanomatous skin cancer or carcinoma in situ (e.g. cervical carcinoma in situ [CIS]) without evidence of disease
No female patients who are pregnant or breastfeeding, or male or female patients of reproductive potential who are not willing to employ effective birth control, because this study involves investigational agents whose genotoxic, mutagenic, and teratogenic effects on the developing fetus and newborn are unknown. Therefore, for women of childbearing potential only, a negative urine or serum pregnancy test pregnancy test done =< 14 days prior to registration is required
REGISTRATION ELIGIBILITY CRITERIA:
Patients without progressive disease per RECIST v 1.1 guidelines (i.e., with an ongoing CR, PR or SD) following completion of 12-15 months of ICI treatment
No toxicity from ICI therapy that makes continuation of treatment clinically unacceptable
Adequate bone marrow and organ functions to continue PD-1/L1 ICI as judged by the treating physician
Age >= 18 years
Eastern Cooperative Oncology Group (ECOG) performance status 0-2
Central nervous system (CNS) metastasis is allowed if radiographically stable, clinically asymptomatic, and prior local therapy (if received) was completed > 6 months before registration
No history of tuberculosis, active hepatitis B (HBV) or hepatitis C (HCV), or uncontrolled human immunodeficiency virus (HIV)
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