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CompletedNCT03872206Updated Jun 7, 2024

Study of HPN536 in Patients With Advanced Cancers Associated With Mesothelin Expression

A Phase 1 interventional study of HPN536 Fixed IV 6 to 560 ng/kg and HPN536 1 Prime Step IV 600-1200 ng/kg Target in Advanced Cancers Associated With Mesothelin Expression, sponsored by Harpoon Therapeutics, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA). Completed at 16 sites in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2024-06-07.

Sponsored by Harpoon Therapeutics, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA) · Phase 1, Interventional, and Treatment

From the registry’s dates

  • Primary completion was Jan 2023, 3 years 9 months ago, and no results have been posted to the registry.
Phase
Phase 1
Study type
Interventional
Enrollment
95
Allocation
Non-randomized
Ages
18 Years and older
Sex
All
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Study summary

An open-label, Phase 1/2a study of HPN536 as monotherapy to assess the safety, tolerability and PK in patients with advanced cancers associated with mesothelin expression.(Phase 2 portion of the study was not conducted.)

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Conditions studied

  • Advanced Cancers Associated With Mesothelin Expression

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03

In context

Neoplasms

9,365 studies on the registry are indexed under Neoplasms; 2,489 are open to participants now.

This study's enrollment of 95 is above the median of 50 across 7,253 interventional studies indexed under Neoplasms.

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Lead sponsor

Harpoon Therapeutics, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA) is the lead sponsor of 4 studies on the registry; none are open to participants now.

Counted across the registry records on this site, refreshed daily.

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Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Eligibility criteria

  1. One of the following progressive advanced or metastatic cancers:

    1. Epithelial ovarian, fallopian tube, or primary peritoneal cancer that is platinum refractory or platinum resistant
    2. Pancreatic adenocarcinoma that is locally advanced, and now with progressive disease on or after front-line treatment
    3. Malignant mesothelioma with epithelioid histology, pleural or peritoneal
  2. For Part 2 only - Measurable disease according to RECIST v1.1 for patients with epithelial ovarian, fallopian tube, or primary peritoneal cancer, pancreatic adenocarcinoma, and peritoneal mesothelioma, and mRECIST v1.1 for patients with pleural mesothelioma
  3. Available archival tissue sample, or fresh biopsy tissue sample must be obtained prior to enrollment. For Part 2 only- a fresh biopsy tissue sample is required.
  4. Adequate bone marrow function, including:

    1. Absolute neutrophil count (ANC) ≥1500/mm3 or ≥1.5 x 109/L
    2. Platelets ≥100,000/mm3 or ≥100 x 109/L
    3. Hemoglobin (Hgb) ≥9 g/dL
  5. Adequate renal function, including estimated creatinine clearance ≥30 mL/min
  6. Adequate liver function, including:

    1. Total serum bilirubin ≤1.5 x upper limit of normal (ULN) unless the patient has documented Gilbert syndrome in which case the maximum total serum bilirubin should be \<5 mg/dL
    2. Aspartate and alanine transaminase (AST and ALT) ≤2.5 x ULN or AST/ALT ≤5 x ULN for patients with liver metastases
  7. Serum albumin ≥30 mg/mL

Key Exclusion Criteria:

  1. Brain metastases unless previously treated. Patients with previously treated brain metastases may participate provided they are clinically stable for at least 4 weeks prior to study entry, and have no evidence of new or enlarging brain metastases
  2. Evidence of retroperitoneal fibrosis, mesothelial surface (pleura, pericardium, peritoneum) thickening of ≥4 mm; significant or increasing pleural/pericardial effusions, ascites or pericarditis at baseline deemed unrelated to the underlying malignancy based on computed tomography (CT), magnetic resonance imaging (MRI), or echocardiogram (ECHO); or prior history of pleurodesis, retroperitoneal fibrosis or mediastinal fibrosis.
  3. Previous Grade 3/4 infusion or hypersensitivity reaction (not immunotoxicity) to treatment with another monoclonal antibody.
  4. For patients with tumor types other than pleural mesothelioma: Ascites requiring >1 paracentesis for therapeutic purposes (i.e., not for diagnosis) within 1 month prior to Cycle 1 Day 1.
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Study design

Phase
Phase 1
Primary purpose
Treatment
Allocation
Non-randomized
Intervention model
Sequential assignment
Masking
None (open label)
Enrollment
95 participants (actual)

Study arms

  • Experimental
    Fixed IV

    HPN536 administered once weekly via IV infusion in doses ranging from 6 to 560 ng/kg

    Biological: HPN536 Fixed IV 6 to 560 ng/kg

  • Experimental
    1 Prime Step IV 600-1200 ng/kg Target

    Step-dosing IV cohorts who received a single Prime Dose followed by the Target Dose (200/600 ng/kg, 200/1200 ng/kg, and 500/900 ng/kg)

    Biological: HPN536 1 Prime Step IV 600-1200 ng/kg Target

  • Experimental
    2 Prime Step IV 900-14000 ng/kg Target

    Step-dosing IV cohorts who received 2 Prime Doses followed by the Target Dose (200/600/900 ng/kg and 200/600/1200 ng/kg; 500/900/1200 ng/kg, 500/900/1800 ng/kg, 500/900/3600 ng/kg, 500/900/7200 ng/kg, and 500/900/14400 ng/kg)

    Biological: 2 Prime Step IV 900-14000 ng/kg Target

Interventions

  • BiologicalHPN536 Fixed IV 6 to 560 ng/kg

    Fixed dose IV cohorts at doses from 6 to 560 ng/kg

  • BiologicalHPN536 1 Prime Step IV 600-1200 ng/kg Target

    Step-dosing IV cohorts who received a single Prime Dose followed by the Target Dose (200/600 ng/kg, 200/1200 ng/kg, and 500/900 ng/kg)

  • Biological2 Prime Step IV 900-14000 ng/kg Target

    Step-dosing IV cohorts who received 2 Prime Doses followed by the Target Dose (200/600/900 ng/kg and 200/600/1200 ng/kg; 500/900/1200 ng/kg, 500/900/1800 ng/kg, 500/900/3600 ng/kg, 500/900/7200 ng/kg, and 500/900/14400 ng/kg)

06

What researchers measure

Primary outcomes

  1. Assessment of Adverse Events by CTCAE 5.0 of HPN536

    Assess safety and tolerability at increasing dose levels of HPN536 in successive cohorts of patients with of patients with epithelial ovarian cancer, fallopian tube cancer, primary peritoneal cancer, pancreatic adenocarcinoma, or mesothelioma (pleural and primary peritoneal) by adverse events (CTCAE v5.0)

    Time frame: 3 years

  2. Determine MTD/RP2D

    Estimate the maximum tolerated dose (MTD) or select the recommended Phase 2 dose (RP2D)

    Time frame: 2 years

  3. Efficacy of HPN536 at the recommended Phase 2 dose: overall response rate (ORR)

    Evaluate overall response rate (ORR) as assessed by RECIST

    Time frame: 1 year

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Study locations

16 sites
  • Mayo Clinic Arizona
    Phoenix, Arizona 85054, United States
  • University of Southern California
    Los Angeles, California 90007, United States
  • University of California Los Angeles
    Los Angeles, California 90095-7170, United States
  • Mayo Clinic Florida
    Jacksonville, Florida 32224, United States
  • University of Chicago
    Chicago, Illinois 60637, United States
  • Massachusetts General Hospital
    Boston, Massachusetts 02114, United States
  • Mayo Clinic Rochester
    Rochester, Minnesota 55905, United States
  • Washington University School of Medicine in St. Louis
    Saint Louis, Missouri 63110, United States
  • Memorial Sloan Kettering Cancer Center
    New York, New York 10017, United States
  • Cleveland Clinic Taussig Cancer Institute
    Cleveland, Ohio 44195, United States
  • Stephenson Cancer Center
    Oklahoma City, Oklahoma 73104, United States
  • Thomas Jefferson University
    Philadelphia, Pennsylvania 19107, United States
  • Sarah Cannon Research Institute
    Nashville, Tennessee 37203, United States
  • Mary Crowley Cancer Research
    Dallas, Texas 75230, United States
  • University of Virginia Cancer Center
    Charlottesville, Virginia 22903, United States
  • University of Washington Medical Center
    Seattle, Washington 98195, United States
08

References and documents

Publications

  • Molloy ME, Austin RJ, Lemon BD, Aaron WH, Ganti V, Jones A, Jones SD, Strobel KL, Patnaik P, Sexton K, Tatalick L, Yu TZ, Baeuerle PA, Law CL, Wesche H. Preclinical Characterization of HPN536, a Trispecific, T-Cell-Activating Protein Construct for the Treatment of Mesothelin-Expressing Solid Tumors. Clin Cancer Res. 2021 Mar 1;27(5):1452-1462. doi: 10.1158/1078-0432.CCR-20-3392. Epub 2020 Dec 1. PubMed 33262134 ↗
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Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jun 7, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT03872206
Lead sponsor
Harpoon Therapeutics, Inc., a subsidiary of Merck & Co., Inc. (Rahway, New Jersey USA)
Responsible party
Sponsor
First posted
Mar 13, 2019
Start date
Apr 16, 2019
Primary completion
Jan 4, 2023
Completion
Jan 4, 2023
Last update
Jun 7, 2024

Oversight

Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Jun 2024. You cannot join it, but the record below documents what was studied.

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