Evaluate BL-M14D1 Plus Atezolizumab vs Standard of Care in First-Line Extensive-Stage Small Cell Lung Cancer

May 28, 2026 updated by: SystImmune Inc.

A Phase 3 Open-Label, Randomized Controlled Trial of BL-M14D1 and Atezolizumab vs. Standard-of-Care Therapy in Patients With First-Line Extensive-Stage Small Cell Lung Cancer

The objective of the study is to evaluate the efficacy and safety of BL-M14D1 in combination with Atezolizumab compared to Standard-of-Care Therapy in adult participants with previously untreated extensive-stage small cell lung cancer (ES-SCLC).

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

This study is a Global Phase 3, open-label, multicenter study designed to evaluate the efficacy and safety of BL-M14D1 in combination with atezolizumab compared with standard-of-care therapy in adult participants with previously untreated extensive-stage small cell lung cancer (ES-SCLC). Standard-of-care therapy consists of carboplatin plus etoposide chemotherapy and atezolizumab, followed by maintenance treatment with atezolizumab with or without lurbinectedin.

Study Type

Interventional

Enrollment (Estimated)

550

Phase

  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Histologically or cytologically confirmed first-line (1L), extensive-stage (ES) small cell lung cancer (SCLC)
  • Must be eligible to receive a platinum-based chemotherapy regimen in combination with an anti-PD-L1 inhibitor.
  • At least one measurable lesion based on RECIST v1.1 per investigator assessment.
  • An Eastern Cooperative Oncology Group performance status (ECOG PS) of 0 to 1.
  • Adequate organ function

Exclusion Criteria:

  • Received any kind of platinum or etoposide treatment for limited stage (LS) SCLC within 6 months prior to enrollment.
  • Participants who have received prior topoisomerase inhibitor-based ADC therapy.
  • Participants with history of severe heart disease
  • Participants with active autoimmune diseases and inflammatory diseases,
  • Participants with other prior or concurrent malignancies except for basal cell carcinoma of the skin, squamous cell carcinoma of the skin and/or carcinoma in situ after adequate resection, or other malignancy treated with curative intent with a disease-free interval of at least 3 years
  • Other protocol-defined inclusion/exclusion criteria apply.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Arm A
BL-M14D1: Administered on days 1 of every 21 days Atezolizumab: Administered dose on days 1 of every 21 days
Drug: BL-M14D1 and Atezolizumab
BL-M14D1 administered in combination with atezolizumab. BL-M14D1 will be given intravenously at the protocol-specified dose and schedule. Atezolizumab will be administered intravenously according to the approved dosing regimen.
Other Names:
  • Atezolizumab
  • BL-M14D1
Experimental: Arm B
BL-M14D1: Administered on days 1 of every 21 days Atezolizumab: Administered dose on days 1 of every 21 days
Drug: BL-M14D1 and Atezolizumab
BL-M14D1 administered in combination with atezolizumab. BL-M14D1 will be given intravenously at the protocol-specified dose and schedule. Atezolizumab will be administered intravenously according to the approved dosing regimen.
Other Names:
  • Atezolizumab
  • BL-M14D1
Active Comparator: Arm C

Medications used in the Control Arm should be administered per local label or institutional guidelines.

Induction therapy (4 cycles):

Carboplatin (AUC of 5 mg/mL*min IV) on Day 1 of each 21-day cycle Etoposide (100 mg/m2 IV) on Days 1 through 3 of each 21-day cycle Atezolizumab (1200 mg) IV on Day 1 of each 21-day cycle

Maintenance therapy (continues until discontinuation criteria are met):

Atezolizumab (1200 mg) IV on Day 1 of each 21-day cycle Lurbinectedin (3.2 mg/m2) IV on Day 1 of each 21-day cycle (to be added only if approved in region and as per PI discretion)
Drug: Carboplatin+ Etoposide + Atezolizumab followed by Atezolizumab and Lurbinectedin
Carboplatin and etoposide will be administered intravenously in combination with atezolizumab for induction therapy, followed by maintenance treatment with atezolizumab with or without lurbinectedin per protocol.
Other Names:
  • Carboplatin
  • Etoposide
  • Atezolizumab
  • Lurbinectedin

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Progression-Free Survival (PFS) per Blinded Independent Central Review (BICR)
Time Frame: Up to approximately 2 years
Progression-free survival (PFS) is defined as the time from randomization to the first documented disease progression, as assessed by blinded independent central review (BICR) according to RECIST v1.1, or death from any cause, whichever occurs first.
Up to approximately 2 years

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Overall Survival (OS)
Time Frame: Up to approximately 2 years
Overall survival (OS) is defined as the time from randomization to death from any cause.
Up to approximately 2 years
Participants with Serious Adverse Events (SAEs)
Time Frame: Up to approximately 5 years
Measuring the number of participants with serious adverse events (SAEs)
Up to approximately 5 years
Participants with treatment-emergent adverse events (TEAEs)
Time Frame: Up to approximately 5 years
Measuring the number of participants with Treatment-emergent adverse events (TEAEs) leading to discontinuation
Up to approximately 5 years
Evaluate the safety of BL-M14D1 in combination with atezolizumab
Time Frame: Up to approximately 5 years
Death
Up to approximately 5 years
Participants with abnormal lab results
Time Frame: Up to approximately 5 years
Measure number of participants with abnormal laboratory results
Up to approximately 5 years
To compare and quantify the impact of BL-M14D1 in combination with atezolizumab on participants' quality of life and functional status
Time Frame: Up to 5 years
Participant Reported Outcome (PRO) using 2 European Organization for Research and Treatment of Cancer (EORTC) Quality of Life Questionnaires (QLQ)
Up to 5 years
Overall Response Rate (ORR)
Time Frame: Up to 5 years
To assess the clinical efficacy of BL-M14D1 as measured by ORR using RECIST criteria v 1.1 per BICR and investigator
Up to 5 years
Disease Control Rate (DCR)
Time Frame: Up to 5 years
To assess the clinical efficacy of BL-M14D1 as measured by DCR using RECIST criteria v 1.1 per BICR and investigator
Up to 5 years
Duration Of Response (DOR)
Time Frame: Up to 5 years
To assess the clinical efficacy of BL-M14D1 as measured by DOR using RECIST criteria v 1.1 per BICR and investigator or death from any cause, whichever occur first
Up to 5 years
Time To Response (TTR)
Time Frame: Up to 5 years
To assess the clinical efficacy of BL-M14D1 as measured by TTR using RECIST criteria v 1.1 per BICR and investigator
Up to 5 years
Progression Free Survival (PFS)
Time Frame: Up to 5 years
To assess the clinical efficacy of BL-M14D1 as measured by PFS using RECIST criteria v 1.1 by investigator or death from any cause, whichever occurs first
Up to 5 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

SystImmune Inc.

Investigators

  • Study Director: Rishi Jain, MD, SystImmune Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 1, 2026

Primary Completion (Estimated)

January 1, 2030

Study Completion (Estimated)

June 1, 2031

Study Registration Dates

First Submitted

May 21, 2026

First Submitted That Met QC Criteria

May 28, 2026

First Posted (Actual)

June 4, 2026

Study Record Updates

Last Update Posted (Actual)

June 4, 2026

Last Update Submitted That Met QC Criteria

May 28, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • BL-M14D1-LC-301

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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