Study of Safety and Efficacy of KTE-C19 in Combination With Atezolizumab in Adults With Refractory Diffuse Large B-Cell Lymphoma (DLBCL)

Kite, A Gilead Company37 enrolled

Overview

The primary objective of phase 1 is to evaluate the safety of KTE-C19 and atezolizumab combination regimens. The primary objective of phase 2 is to evaluate the efficacy of KTE-C19 and atezolizumab, as measured by complete response rate in participants with refractory diffuse large B-cell lymphoma (DLBCL). Participants who received an infusion of KTE-C19 will complete the remainder of the 15 year follow-up assessments in a separate long-term follow-up study, KT-US-982-5968 (NCT05041309).

Study Type

INTERVENTIONAL

Allocation

NON_RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

Conditions

Refractory Diffuse Large B Cell Lymphoma

Interventions

KTE-C19

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Key Inclusion Criteria: 1. Histologically confirmed DLBCL 2. Chemotherapy-refractory disease, defined as one or more of the following: * Stable disease (duration of stable disease must be less than or equal to 6 months) or progressive disease as best response to most recent chemotherapy containing regimen * Disease progression or recurrence less than or equal to 12 months of prior autologous stem cell transplantation (SCT) 3. Individuals must have received adequate prior therapy including at a minimum: * Anti-cluster of differentiate 20 (anti-CD20) monoclonal antibody unless investigator determines that tumor is CD20-negative; and * an anthracycline containing chemotherapy regimen 4. At least one measurable lesion per revised International Working Group (IWG) Response Criteria 5. Age 18 years or older 6. Eastern cooperative oncology group (ECOG) performance status of 0 or 1 7. Adequate organ and bone marrow function 8. All individuals or legally appointed representatives/caregivers, must personally sign and date the institutional review board (IRB)/independent ethics committee (IEC) approved consent form before initiating any study specific procedures or activities. Key Exclusion Criteria: 1. History of malignancy other than nonmelanoma skin cancer or carcinoma in situ (e.g., cervix, bladder, breast) or follicular lymphoma unless disease free for at least 3 years 2. History of allogeneic stem cell transplantation 3. Prior CAR therapy or other genetically modified T cell therapy 4. Clinically significant active infection 5. Known history of infection with human immunodeficiency virus (HIV) or hepatitis B (HBsAg positive) or hepatitis C virus (anti-HCV positive) 6. Individuals with detectable cerebrospinal fluid malignant cells or brain metastases or with a history of cerebrospinal fluid malignant cells or brain metastases 7. History of a seizure disorder, cerebrovascular ischemia/hemorrhage, dementia, cerebellar disease, or any autoimmune disease with central nervous system (CNS) involvement 8. History of autoimmune disease. Participants with a history of autoimmune-related hypothyroidism on a stable dose of thyroid replacement hormone and participants with controlled type 1 diabetes mellitus on a stable insulin regimen may be eligible for this study. 9. History of idiopathic pulmonary fibrosis, organizing pneumonia (e.g., bronchiolitis obliterans), drug-induced pneumonitis, idiopathic pneumonitis, or evidence of active pneumonitis per chest computed tomography (CT) scan at screening. History of radiation pneumonitis in the radiation field (fibrosis) is allowed. 10. Prior treatment with Programmed Cell Death Ligand 1 (PD-L1) inhibitor, PD-1 inhibitor, anti-CTLA4, anti-CD137, anti-OX40 or other immune checkpoint blockade or activator therapy with the exception of Individuals who received atezolizumab in this study and are eligible for re-treatment 11. Prior CD19 targeted therapy Note: Other protocol defined Inclusion/Exclusion criteria may apply

Locations (5)

City of Hope

Duarte, California, United States

Stanford Cancer Center

Palo Alto, California, United States

H Lee Moffitt Cancer Center

Tampa, Florida, United States

Dana Farber Cancer Institute

Boston, Massachusetts, United States

University of Texas MD Anderson Cancer Center

Houston, Texas, United States

Outcomes

Primary Outcomes

Phase 1: Number of Participants Experiencing Dose-Limiting Toxicities (DLTs)

A DLT was defined as the following KTE-C19-related or ATZ-related events with an onset from immediately after the first ATZ infusion through 21 days after the first ATZ infusion: Grade 4 hematologic toxicity lasting \> 30 days (except lymphopenia or B-cell aplasia); All KTE-C19- or ATZ-related Grade 3 non-hematologic toxicities lasting for \> 7 days and all KTE-C19- or ATZ-related Grade 4 non-hematologic toxicities regardless of duration.

Time frame: Baseline up to 21 days

Phase 1 and 2: Complete Response Rate (CRR)

CRR was assessed based on the International Working Group Revised Response Criteria for Malignant Lymphoma (Cheson, 2007), and was defined as the percentage of participants achieving a complete response (CR) as assessed by the study investigators. CR was defined as the complete resolution of all disease-related radiological abnormalities and the disappearance of all signs and symptoms related to the disease.

Time frame: From enrollment until first occurrence of CR or PR (maximum duration: 6.2 years)

Secondary Outcomes

Phase 1 and 2: Objective Response Rate (ORR)

ORR was assessed based on the International Working Group Revised Response Criteria for Malignant Lymphoma (Cheson, 2007), and was defined as the percentage of participants achieving a CR or partial response (PR) as assessed by the study investigators. CR was defined as the complete resolution of all disease-related radiological abnormalities and the disappearance of all signs and symptoms related to the disease. PR was defined at least a 50% decrease in sum of the product of the diameters (SPD) of up to six of the largest dominant nodes or nodal masses. Participants who did not meet the criteria for objective response by the analysis cutoff date were considered non-responders.

Time frame: From enrollment until first occurrence of CR or PR (maximum duration: 6.2 years)

Phase 1 and 2: Duration of Response (DOR)

DOR for participants who experienced an objective response was defined as the date of their first confirmed objective response (CR or PR) to disease progression per the revised International Working Group Response Criteria for Malignant Lymphoma (Cheson, 2007) or death regardless of cause. CR was defined as the complete resolution of all disease-related radiological abnormalities and the disappearance of all signs and symptoms related to the disease. PR was defined at least a 50% decrease in SPD of up to six of the largest dominant nodes or nodal masses. Disease progression was defined as any new lesion or increase by ≥ 50% of previously involved sites from nadir. The Kaplan-Meier approach was used to estimate DOR.

Time frame: From the date of first confirmed objective response (CR or PR) to disease progression or death regardless of cause (maximum duration: 6.2 years)

Phase 1 and 2: Progression-Free Survival (PFS)

PFS was defined as the time from the KTE-C19 infusion date to the date of disease progression per the revised International Working Group Response Criteria for Malignant Lymphoma (Cheson, 2007) or death from any cause. Disease progression was defined as any new lesion or increase by ≥ 50% of previously involved sites from nadir. The Kaplan-Meier approach was used to estimate PFS.

Time frame: From the date of first KTE-C19 infusion to disease progression or death regardless of cause (maximum duration: 6.2 years)

Phase 1 and 2: Overall Survival (OS)

OS was defined as the time from KTE-C19 infusion to the date of death from any cause. The Kaplan-Meier approach was used to estimate OS.

Time frame: From the date of first KTE-C19 infusion to the date of death regardless of cause (maximum duration: 6.2 years)

Phase 1 and 2: Percentage of Participants Experiencing Treatment-Emergent Adverse Events (TEAEs)

An adverse event was defined as any untoward medical occurrence in a clinical trial participant. The event did not necessarily have a relationship with study treatment. Adverse events included worsening of a pre-existing medical condition. Worsening indicated that the pre-existing medical condition had increased in severity, frequency, and/or duration or had an association with a worse outcome. A pre-existing condition that had not worsened during the study or involved an intervention such as elective cosmetic surgery or a medical procedure while in study, was not considered an adverse event. TEAEs included all AEs with onset on or after initiation of axicabtagene ciloleucel.

Time frame: Up to 1.8 years

Phase 1 and 2: Percentage of Participants With Serum Chemistry Toxicity Grade Shifts to Grade 3 or Higher Resulting From Increased Parameter Values

Post axicabtagene ciloleucel infusion lab toxicities were reported. It included lab toxicities observed on or after the axicabtagene ciloleucel infusion date. ALT = alanine aminotransferase; ALP = alkaline phosphatase; AST = aspartate aminotransferase.

Time frame: Up to 1.8 years

Phase 1 and 2: Percentage of Participants With Serum Chemistry Toxicity Grade Shifts to Grade 3 or Higher Resulting From Decreased Parameter Values

Post axicabtagene ciloleucel infusion lab toxicities were reported. It included lab toxicities observed on or after the axicabtagene ciloleucel infusion date.

Time frame: Up to 1.8 years

Phase 1 and 2: Percentage of Participants With Hematology Toxicity Grade Shifts to Grade 3 or Higher Resulting From Increased Parameter Values

Post axicabtagene ciloleucel infusion lab toxicities were reported. It included lab toxicities observed on or after the axicabtagene ciloleucel infusion date.

Time frame: Up to 1.8 years

Phase 1 and 2: Percentage of Participants With Hematology Toxicity Grade Shifts to Grade 3 or Higher Resulting From Decreased Parameter Values

Post axicabtagene ciloleucel infusion lab toxicities were reported. It included lab toxicities observed on or after the axicabtagene ciloleucel infusion date.

Time frame: Up to 1.8 years

Phase 1 and 2: Peak Anti-CD19 CAR T-Cell (KTE-C19) Level (Maximum Observed Plasma Concentration) in Blood

Time frame: Pre-infusion (Baseline); Post-infusion: Days 7 (Phase 2), 14, 22 (Phase 2), 28 (Phase 2; optional), 35 (Phase 1, Cohort 3; optional), 43, 49 (optional), 64, 69 (optional), 94; long-term follow-up: every 3 months from Month 6 to Month 18, and Month 24

Phase 1 and 2: Percentage of Participants With Anti-KTE-C19 Antibodies

Time frame: Baseline (pre-conditioning chemotherapy); Day 0 (pre-KTE-C19 infusion); Days 1, 4, 7, 14, 22 , 28, Day 35, 49, 69, and 94 post-KTE-C19 infusion

Phase 1 and 2: Atezolizumab Levels in Blood

Time frame: Days 1, 14, 21, 22, 35, 42, 43, 56, 63, 64, 77, 84, 154, and 174

Phase 1 and 2: Percentage of Participants With Anti-Atezolizumab Antibodies

Time frame: Baseline (pre-conditioning chemotherapy); Day 0 (pre-KTE-C19 infusion); Days 1, 4, 7, 14, 22 , 28, Day 35, 49, 69, and 94 post-KTE-C19 infusion

Phase 1 and 2: Peak Serum Levels of C-Reactive Protein (CRP) in Blood

Time frame: Baseline (pre-conditioning chemotherapy); Day 0 (pre-KTE-C19 infusion); Days 1, 4, 7, and 14, and 22 , optional Day 28 (Phase 2) or Day 35 (Phase 1 Cohort 3), optional Day 49, optional Day 69, and Day 94 post-KTE-C19 infusion

Phase 1 and 2: Peak Serum Levels of C-X-C Motif Chemokine 10 (CXCL10), Interferon-Gamma (IFN-γ), Interleukin-1 Receptor Antagonist (IL-1RA), Interleukin (IL)-2, IL-6, IL-8, IL-15, and Tumor Necrosis Factor-Alpha (TNF-α) in Blood

Phase 1 and 2: Peak Serum Levels of Ferritin in Blood

Phase 1 and 2: Peak Serum Levels of Interleukin-2 Receptor Alpha (IL-2Rα) in Blood