General Information of This Payload
Payload ID
PAY0LVQIM
Name
T785
Target Toll-like receptor 7 (TLR7); Toll-like receptor 8 (TLR8)
Structure
Each Antibody-drug Conjugate Related to This Payload
Full Information of The Activity Data of The ADC(s) Related to This Payload
Trastuzumab imbotolimod [Phase 2 (discontinued)]
Identified from the Human Clinical Data
Click To Hide/Show 3 Activity Data Related to This Level
Experiment 1 Reporting the Activity Date of This ADC [1]
Efficacy Data Partial Response (PR)
27%
Patients Enrolled
Eligible patients must have HER2-positive advanced solid tumors with exhausted treatment options, measurable disease (RECIST 1.1), ECOG 0-1, and available tumor tissue. Exclusions include hypersensitivity to study drugs, prior TLR7/8 agonist treatment, cardiac dysfunction, active infections (HIV, HBV, HCV, SARS-CoV-2), and untreated CNS metastases. Other protocol-specific criteria may apply.

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Administration Dosage
Pts with HER2+ (protein or gene) or HER2-low solid tumors progressing after standard therapies (Txs) were enrolled. BDC-1001 was given IV q3w, q2w, or q1w as monotherapy (mono; n=94) and q2w or q1w with nivolumab 240mg q2w (combo; n=37).
Related Clinical Trial
NCT Number NCT04278144  Phase Status PHASE1|||PHASE2
Clinical Description
Phase 1/2 Study of BDC-1001 As a Single Agent and in Combination with Nivolumab in Patients with Advanced HER2-Expressing Solid Tumors
Primary Endpoint
The study evaluates safety (AEs, SAEs, DLTs, and immune-related toxicities) and determines the maximum tolerated dose (MTD) during the escalation phase, alongside assessing ORR of complete/partial responses (CR/PR) in the expansion phase over a 2-year timeframe.
Other Endpoint
Pharmacokinetic parameters (Cmax, Cmin, AUC, CL, Vz, t1/2) of BDC-1001 are measured during both escalation and expansion periods, alongside efficacy outcomes (ORR, DOR, DCR, PFS per RECIST 1.1) and immunogenicity (anti-BDC-1001 antibodies) over 2 years.
Experiment 2 Reporting the Activity Date of This ADC [2]
Patients Enrolled
Eligible participants must have confirmed HER2+ breast adenocarcinoma (IHC 3+/ISH+/NGS+) with ≥2 prior anti-HER2 therapies (including trastuzumab deruxtecan), measurable disease, ECOG 0-1, and biopsy/archival tissue. Key exclusions cover hypersensitivity to BDC-1001/pertuzumab, prior TLR7/8 agonist treatment, significant cardiac disease, active viral infections, and unstable CNS metastases.

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Administration Dosage
BDC-1001 administered intravenously (IV) every 2 weeks
Related Clinical Trial
NCT Number NCT05954143  Phase Status PHASE2
Clinical Description
Phase 2, Multi-Center, Randomized, Open-Label Trial of BDC-1001 As a Single Agent and in Combination with Pertuzumab in Subjects with HER2-Positive Metastatic Breast Cancer Previously Treated with Trastuzumab Deruxtecan
Primary Endpoint
The efficacy of BDC-1001 alone and combined with pertuzumab is evaluated through Objective Response Rate (ORR) per RECIST v1.1 at 12 weeks.
Other Endpoint
Additional endpoints include long-term efficacy (DOR, DCR, PFS, OS up to 24 months), safety (TEAEs/TESAEs), pharmacokinetics (Cmin, Cmax), and immunogenicity (anti-BDC-1001 ADAs) during the 24-month period for both single-agent and combination therapy.
Experiment 3 Reporting the Activity Date of This ADC [3]
Patients Enrolled
Patients with advanced metastatic HER2-expressing (IHC2/3+) or amplified solid tumors. Patients had received a median of 4 prior therapies.
Administration Dosage
4 dose levels (0.15-5.00 mg/kg) every 3 weeks.
Related Clinical Trial
NCT Number NCT04278144  Phase Status Phase 1/2
Clinical Description
Phase 1/2 study of BDC-1001 as a single agent and in combination with nivolumab in patients with advanced HER2-expressing solid tumors.
References
Ref 1 A First-in-human Study Using BDC-1001 As a Single Agent and in Combination with Nivolumab in Advanced HER2-Expressing Solid Tumors
Ref 2 Trial of BDC-1001 +/- Pertuzumab in Subjects with HER2-Positive Metastatic Breast Cancer
Ref 3 Preliminary results from a phase 1/2 study of BDC-1001, a novel HER2 targeting TLR7/8 immune-stimulating antibody conjugate (ISAC), in patients (pts) with advanced HER2-expressing solid tumors. J Clin Oncol. 2021 39:15_suppl, 2549-2549.