Study Evaluating Tarlatamab After Chemoradiotherapy in Limited-Stage Small-Cell Lung Cancer (LS-SCLC)

Study Overview
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Brief Summary
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The primary objective of this study is to compare the efficacy of tarlatamab with placebo as assessed by progression free survival (PFS).

Official Title
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A Phase 3, Randomized, Double-blind, Placebo-controlled, Multicenter Study of Tarlatamab Therapy in Subjects With Limited-Stage Small-Cell Lung Cancer (LS-SCLC) Who Have Not Progressed Following Concurrent Chemoradiation Therapy

Conditions
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Limited Stage Small Cell Lung Cancer, Small Cell Lung Cancer

Intervention / Treatment
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* Drug: Tarlatamab
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: -Participants are eligible to be included in the study only if all of the following criteria apply: Participant has provided informed consent prior to initiation of any study specific activities/procedures. Age ≥ 18 years (or ≥ legal age within the country if it is older than 18 years). Histologically or cytologically confirmed small-cell lung cancer (SCLC). Diagnosed and treated for LS-SCLC with concurrent chemotherapy and radiotherapy. Has completed chemoradiotherapy without progression per Response Evaluation Criteria in Solid Tumors v1.1 (RECIST 1.1.) Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) of 0 or 1. Minimum life expectancy of 12 weeks. Adequate organ function. Toxicities attributed to concurrent chemoradiotherapy resolved to grade ≤ 1, unless otherwise specified. Excluding alopecia. Exclusion Criteria: -Participants are excluded from the study if any of the following criteria apply: Disease Related Extensive-stage SCLC (ES-SCLC). Any previous diagnosis of transformed non-small-cell lung cancer (NSCLC), epidermal growth factor receptor (EGFR) activating mutation positive NSCLC that has transformed to SCLC, or mixed SCLC NSCLC histology. Evidence of interstitial lung disease or active, non-infectious pneumonitis. Other Medical Conditions History of other malignancy within the past 2 years, with certain exceptions. History of solid organ transplantation. Myocardial infarction and/or symptomatic congestive heart failure (New York Heart Association > class II) within 6 months prior to first dose of study treatment. History of arterial thrombosis (eg, stroke or transient ischemic attack) within 6 months prior to first dose of study treatment. Exclusion of human immunodeficiency virus (HIV) and hepatitis infection based on criteria per protocol. Participant with symptoms and/or clinical signs and/or radiographic signs that indicate an acute and/or uncontrolled active systemic infection within 7 days prior to the first dose of study treatment. Prior/Concomitant Therapy Received sequential chemotherapy and thoracic radiotherapy (no overlap of thoracic radiotherapy with chemotherapy) during chemoradiation. Prior therapy with any selective inhibitor of the delta-like ligand 3 (DLL3) pathway. Prior history of severe or life-threatening events from any immune-mediated therapy. Receiving another anti-cancer therapy. Adjuvant hormonal therapy for resected breast cancer is permitted. Receiving systemic corticosteroid therapy or any other form of immunosuppressive therapy within 7 days prior to enrollment. Major surgical procedures within 28 days prior to first dose of study treatment. Treatment with live virus, including live-attenuated vaccination, within 14 days prior to the first dose of study treatment. Inactive vaccines and live viral non-replicating vaccines within 3 days prior to first dose of study treatment. Prior/Concurrent Clinical Study Experience • Treatment in an alternative investigational trial within 28 days prior to enrollment. Other Exclusions Female participants of childbearing potential unwilling to use protocol specified method of contraception during treatment and for an additional 72 days after the last dose of study treatment. Female participants who are breastfeeding or who plan to breastfeed while on study through 72 days after the last dose of study treatment. Female participants planning to become pregnant or donate eggs while on study through 72 days after the last dose of study treatment. Female participants of childbearing potential with a positive pregnancy test assessed at screening by a highly sensitive serum pregnancy test. Male participants with a female partner of childbearing potential who are unwilling to practice sexual abstinence (refrain from heterosexual intercourse) or use contraception during treatment and for an additional 132 days after the last dose of study treatment. Male participants with a pregnant partner who are unwilling to practice abstinence or use a condom during treatment and for an additional 132 days after the last dose of study treatment. Male participants unwilling to abstain from donating sperm during treatment and for an additional 132 days after the last dose of study treatment. Participant has known sensitivity to any of the products or components to be administered during dosing. Participant likely to not be available to complete all protocol-required study visits or procedures, and/or to comply with all required study procedures (eg, Clinical Outcome Assessments) to the best of the participant and investigator's knowledge. History or evidence of any other clinically significant disorder, condition, or disease (with the exception of those outlined above) that, in the opinion of the investigator or Amgen physician, if consulted, would pose a risk to participant safety or interfere with the study evaluation, procedures or completion.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Tarlatamab<br>Participants will receive tarlatamab on Cycle 1 Day 1, 8 and 15, and once every 2 weeks (Q2W) thereafter (cycle is 28 days). | Drug: Tarlatamab<br>* Intravenous (IV) infusion<br>* Other names: AMG 757;|
| Placebo Comparator: Placebo<br>Participants will receive placebo on Cycle 1 Day 1, 8 and 15, and Q2W thereafter (cycle is 28 days). | Drug: Placebo<br>* IV infusion<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| PFS as Determined by Blinded Independent Central Review (BICR) |  | Up to approximately 6 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overall Survival (OS) Over the Whole Trial |  | Up to approximately 6 years | 
| PFS Determined by Investigator Assessment |  | Up to approximately 6 years | 
| Objective Response (OR) Rate |  | Up to approximately 6 years | 
| Disease Control (DC) Rate |  | Up to approximately 6 years | 
| Duration of Response (DOR) |  | Up to approximately 6 years | 
| PFS at 6 months, 1 year, 2 years |  | 6 months, 1 year, 2 years | 
| OS at 6 months, 1 year, 2 years, 3 years |  | 6 months, 1 year, 2 years, 3 years | 
| Time to Progression (TTP) |  | Up to approximately 6 years | 
| Number of Participants with Treatment-emergent Adverse Events (TEAEs) |  | Up to approximately 6 years | 
| Serum Concentration of Tarlatamab |  | Up to approximately 4 months | 
| Incidence of Anti-tarlatamab Antibody Formation |  | Up to approximately 1 year | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Limited Stage Small Cell Lung Cancer, Small Cell Lung Cancer, LS SCLC, SCLC, AMG 757, Tarlatamab