A Study of MHB088C Injection Versus Treatment of Physician's Choice in Subjects With Relapsed Small Cell Lung Cancer

Official title

A Phase 3, Multicenter, Randomized, Open-label Study of MHB088C for Injection Versus Treatment of Physician's Choice (TPC) in Comparing the Efficacy and Safety in Subjects With Relapsed Small Cell Lung Cancer (SCLC)

Overview

This study was designed to compare the efficacy and safety of MHB088C for Injection with treatment of physician's choice (TPC) in participants with relapsed small cell lung cancer (SCLC).

Detailed description

The primary objective of this study is to assess whether treatment with MHB088C for Injection improves prolongs overall survival (OS) compared with treatment of physician's choice among participants with relapsed SCLC.

The secondary objectives of the study are to further evaluate the efficacy/safety of MHB088C for Injection, immunogenicity of MHB088C, and characterize the pharmacokinetics of MHB088C.

Interventions

• Drug MHB088C for Injection
  2 mg/kg intravenous dose on Day 1 and Day 15 of each 28-day cycle
• Drug Topotecan
  1.25 mg/m\^2 intravenous dose on Day 1 to Day 5 of each 21-day cycle
• Drug Irinotecan
  65 mg/m\^2 intravenous dose on Day 1 and Day 8 of each 21-day cycle
• Drug Paclitaxel
  135 mg/m\^2 intravenous dose on Day 1 of each 21-day cycle

Primary outcome measures

• Overall Survival [Time frame: From the date of randomization to the date of death due to any cause, up to approximately 5 years]

Secondary outcome measures (7)

• Number of Participants With Objective Response Rate Assessed by Investigator [Time frame: Baseline up until documented progressive disease, death, lost to follow-up, or withdrawal by the participant, up to approximately 5 years]
• Progression-free Survival As Assessed by Investigator [Time frame: Baseline up until documented progressive disease, death, lost to follow-up, or withdrawal by the participant, up to approximately 5 years]
• Duration of Response As Assessed by Investigator [Time frame: From the date of first documentation of confirmed response (CR or PR) to the first documentation of objective progression or to death due to any cause, whichever occurs first, up to approximately 5 years]
• Disease Control Rate As Assessed by Investigator [Time frame: Baseline up until documented progressive disease, death, lost to follow-up, or withdrawal by the participant, up to approximately 5 years]
• Incidence and severity of adverse events (AEs), serious adverse events (SAEs), AEs leading to treatment interruption, and AEs leading to treatment discontinuation. [Time frame: Baseline up to 5 years]
• Pharmacokinetic Parameter Maximum Concentration for MHB088C, Total Anti-B7-H3 Antibody, and MH30010008 [Time frame: Day 1 and 15 of Cycle 1 before infusion (BI), end of infusion (EOI), and 5 hours after completion of infusion; Day 1 of Cycle 2 to Cycle 5, BI and EOI; Day 1 of Cycle 6 and every 3 cycles thereafter up to 5 years and EOT visit, BI (each cycle is 28 days)]
• Pharmacokinetic Parameter Time to Maximum Concentration for MHB088C, Total Anti-B7-H3 Antibody, and MH30010008 [Time frame: Day 1 and 15 of Cycle 1 before infusion (BI), end of infusion (EOI), and 5 hours after completion of infusion; Day 1 of Cycle 2 to Cycle 5, BI and EOI; Day 1 of Cycle 6 and every 3 cycles thereafter up to 5 years and EOT visit, BI (each cycle is 28 days)]

Eligibility criteria

Inclusion criteria

Participants must meet all the following criteria to be eligible for randomization into the study:

• Voluntarily consent to participate in this study and sign the informed consent form.
• Adults ≥18 years, regardless of gender.
• ECOG performance status score of 0-1.
• Estimated survival time of more than 3 months.
• Capable of understanding trial requirements, willing and able to comply with trial and follow-up procedures.
• Has histologically or cytologically documented small cell lung cancer (SCLC).
• Extensive-stage SCLC with disease progression after at least two cycles of platinum-based and PD-1/L1 systemic therapy, with no more than two prior lines of therapy. Prior PD-1/L1 systemic therapy was allowed to use with or without platinum-based regimens.
• Agrees to provide pre-treatment tumor tissue samples for retrospective analysis of B7-H3 expression and other biomarkers.
• Has at least 1 measurable lesion according to RECIST v1.1 as assessed by the investigator.
• Sufficient bone marrow and organ function.

Exclusion criteria

Participants who meet any of the following criteria will be disqualified from entering the study:

• Diagnosis of other primary malignancies within 5 years prior to signing the informed consent form.
• Prior pathological diagnosis of combined SCLC, or any transformed non-small cell lung cancer or transformed SCLC.
• Receipt of chemotherapy within 4 weeks prior to the first administration of study drug, or receipt of radiotherapy, biologics, endocrine therapy, immunotherapy, or other anti-tumor therapy within 4 weeks prior to the first dose.
• Previous or ongoing treatment with topoisomerase I inhibitors, including antibody-drug conjugates (ADCs) containing topoisomerase I inhibitor payloads.
• Brain metastases (unless asymptomatic and stable for more than 4 weeks prior to randomization); presence of leptomeningeal metastases or brainstem metastases; spinal cord compression (identified via imaging, regardless of symptoms).
• Bone marrow metastasis.
• Prior B7-H3-targeted therapy.
• Has uncontrolled or significant cardiovascular disease.
• Moderate-to-severe pulmonary disease significantly impairing lung function, including idiopathic pulmonary fibrosis, autoimmune/connective tissue disorders with lung involvement, or prior pneumonectomy.
• Has history of (non-infectious) interstitial lung disease (ILD)/pneumonitis that required corticosteroids, current ILD/pneumonitis, or suspected ILD/pneumonitis that cannot be ruled out by imaging at Screening.
• Moderate or severe pulmonary diseases severely affecting lung function.
• Active tuberculosis, autoimmune diseases not in clinical remission, other acquired or congenital immunodeficiency diseases, or history of allogeneic stem cell, bone marrow, or organ transplantation.
• Serious infections within 4 weeks before the first dose, including but not limited to those requiring systemic antibiotic therapy, bacteremia, or severe pneumonia.
• Clinically uncontrolled third-space effusion requiring intervention, including pleural or peritoneal effusions.
• Known hypersensitivity to investigational product components, analogues, or control drugs (e.g., topotecan, irinotecan, paclitaxel).
• Pregnant or lactating women, or women/men intending to conceive.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation

Randomized

Model

Parallel assignment

Masking

Open label

Primary purpose

Treatment

Study locations

China · 1 center

• Shanghai East Hospital — Shanghai

Identifiers

NCT: NCT06954246 · MHB088C-P-301

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗