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A Study of LY4175408 in Participants With Advanced Cancer

A First-in-Human, Phase 1a/1b Trial to Assess the Safety, Tolerability and Preliminary Efficacy of LY4175408, an Antibody Drug Conjugate Targeting Protein Tyrosine Kinase 7-Expressing Tumor Cells, in Participants With Selected Advanced Solid Tumors - J6D-MC-JSDA

Status
Active, not recruiting
Phases
Phase 1
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT2051250100
Enrollment
240
Registered
2025-09-02
Start date
2025-10-01
Completion date
Unknown
Last updated
2026-05-25

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

NSCLC SCLC Endometrial Neoplasms Neoplasm Metastasis TNBC

Interventions

DRUG: LY4175408 IV infusion [Study Arms] Experimental: Phase 1a Dose Escalation (Cohort A1) Escalating doses of LY4175408 administered intravenously (IV) Interventions: Drug: LY4175408 Expe

Sponsors

Masaki Takeshi
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: - Have one of the following advanced or metastatic solid tumor cancers: * Non-small cell lung cancer (NSCLC) * Small cell lung cancer (SCLC) * Endometrial cancer * Triple negative breast cancer (TNBC) (characterized by HR-negative disease and HER2-negative expression according to American Society of Clinical Oncology (ASCO) - College of American Pathologists guidelines). - Received all standard therapies for which the individual was deemed to be an appropriate candidate by the treating investigator; OR the individual is refusing the remaining most appropriate standard of care treatment; OR there is no standard therapy available for the disease. - Eastern Cooperative Oncology Group (ECOG) performance status of <=1. - For dose optimization/dose and expansion cohorts (Cohort A2, Cohort B): Measurable disease per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1.

Exclusion criteria

Exclusion criteria: - Prior treatment with a protein tyrosine kinase 7 (PTK7) antibody-drug conjugate (ADC) with a topoisomerase I inhibitor as payload (prior therapy with a PTK7 ADC with a non-topoisomerase I inhibitor payload OR non-PTK7 ADC with any payload is permitted). - Any serious unresolved toxicities from prior therapy. - Individual with known or suspected history of uncontrolled central nervous system (CNS) metastases. - Individual with active uncontrolled systemic bacterial, viral, fungal, or parasitic infection. - Significant cardiovascular disease. - Prolongation of QT interval corrected for heart rate using Fridericia's formula (QTcF) > 470 milliseconds (ms) - History of pneumonitis/interstitial lung disease. - Individuals who are pregnant, breastfeeding, or plan to breastfeed during the trial or within 30 days of the last dose of trial intervention.

Design outcomes

Primary

MeasureTime frame
Phase 1a-Number of Participants with Dose Limiting Toxicities of LY4175408 [ Time Frame: 1 Cycle (21 days) Phase 1b-Overall Response Rate (ORR): Percentage of Participants with Best Response of Complete Response (CR) or Partial Response (PR) [ Time Frame: Baseline up to approximately 4 years]

Countries

France, Japan, Republic of Korea, Spain, United States

Contacts

Public ContactTrial Guide Call Center Trial Guide Call Center

Eli Lilly Japan K.K.

LTG_CallCenter@lists.lilly.com+81-120-023-812

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: May 30, 2026