A First-in-Human Phase I Trial With Antibody Drug Conjugate ADCT-701 in Neuroendocrine Tumors, Carcinomas and Malignant Peripheral Nerve Sheath Tumors

March 26, 2026 updated by: National Cancer Institute (NCI)

Background:

Neuroendocrine neoplasms (NENs) are rare cancers in the gastrointestinal tract, pancreas, lungs, adrenal glands, and other areas of the body. Many of these cancers have a high risk of relapse and a low chance of survival. Better treatments are needed.

Objective:

To test a new drug, ADCT-701, in people with NENs.

Eligibility:

Adults aged 18 and older with NENs.

Design:

Participants will be screened. They will have a physical exam with blood and urine tests. They will have imaging scans and tests of heart functioning. Their ability to perform normal daily activities will be tested. A biopsy may be needed: A sample of tissue will be removed from the tumor.

ADCT-701 is given through a tube attached to a needle inserted into a vein in the arm. Participants will receive the drug treatment on the first day of 21-day treatment cycles. They will visit the clinic a total of 10 times during the first two cycles. After that, they will visit the clinic 2 times during each cycle. Imaging scans, blood draws, heart function tests, and other tests will be repeated during study visits. Each visit will last up to 8 hours.

Participants may continue receiving treatment with the study drug for up to 2 years.

After treatment ends, participants will have follow-up clinic visits 4 times in 4 months. They will have a physical exam, with heart and blood tests, at each visit. After that, they will have follow-up clinic visits every 9 weeks; these visits will include imaging scans.

Follow-up visits will continue for up to 5 years after treatment began....

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

Background:

-Neuroendocrine neoplasms (NENs) are divided into neuroendocrine tumors (NETs) and neuroendocrine carcinomas (NECs). These are rare malignancies occurring in areas such as the gastrointestinal tract, islets of the pancreas, lung, adrenal gland, and other areas of

the body.

  • Poorly differentiated neuroendocrine carcinomas are all high-grade carcinomas that resemble small-cell lung cancer (SCLC). Poorly differentiated NECs are also treated with platinum-based regimens in accordance with small cell carcinoma guidelines and have a high risk of relapse as well as a poor response to further systemic therapies.
  • Adrenocortical carcinoma (ACC) is a rare malignancy with an average survival from the time of diagnosis of 14.5 months. In advanced diseases, chemotherapy options have limited benefits. To date, no "targeted therapy" has been shown to have significant efficacy in this disease.
  • Malignant peripheral nerve sheath tumors (MPNST) are the most common Neurofibromatosis Type 1 (NF1) associated malignancy and leading cause of death in patients with NF1 with no effective medical therapies available.
  • Pre-clinical studies have shown that Delta-like non-canonical notch ligand 1 (DLK1) is expressed in multiple neuroendocrine neoplasms such as ACC, SCLC, neuroblastoma, pheochromocytoma, paraganglioma, and MPNST.
  • ADCT-701 a humanized antibody directed against DLK1 effectively suppresses tumor growth and improves survival in multiple cancer models which express DLK1.

Objective:

-To determine the maximum tolerated dose (MTD) of ADCT-701 in participants with neuroendocrine neoplasms, malignant adrenocortical carcinoma or malignant peripheral nerve sheath tumor (MPNST)

Eligibility:

  • Histologically or cytologically confirmed neuroendocrine neoplasms, malignant ACC, or refractory or metastatic MPNST.
  • Age >= 18 years.
  • Evaluable disease, per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1.
  • Adequate organ and bone marrow function.
  • Eastern Cooperative Oncology Group (ECOG) <= 2.

Design:

  • This is a First in Human phase I dose escalation study of ADCT-701-single agent in participants with NENs or MPNST.
  • Participants will be enrolled in a dose-finding trial. A 3+3 design with up to ten dose levels of ADCT-701 will be evaluated in this trial. The study drug dose will be escalated unless the occurrence of dose-limiting toxicities limits further escalation or until the maximum tolerated dose (MTD) level is reached or an optimal dose is determined.
  • Up to 70 evaluable patients will be enrolled over a maximum of 10 dose levels.

Study Type

Interventional

Enrollment (Estimated)

70

Phase

  • Phase 1

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

Study Contact Backup

Study Locations

  • United States
    • Maryland
      • Bethesda, Maryland, United States, 20892
        • Recruiting
        • National Institutes of Health Clinical Center
        • Contact:
        • 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:
  • Participants must have histologically or cytologically confirmed neuroendocrine neoplasms or malignant adrenocortical carcinoma (ACC) or malignant peripheral nerve sheath tumors (MPNST).
  • Locally advanced, unresectable or metastatic disease (as confirmed by a radiological evaluation)
  • Participants must have measurable disease per RECIST 1.1.
  • Participants must have received prior standard of care treatment and be refractory to or intolerant to standard of care therapy(s). Note: Patients with MPNST who have refused cytotoxic chemotherapy or for whom treatment on this protocol prior to receiving cytotoxic

chemotherapy is felt to be in the best interest for the patient by the local investigator and treating investigator will also be eligible.

  • Age >= 18 years.
  • ECOG performance status <= 2.

  • Adequate hematologic function as follows:

    • Leukocytes >= 3,000/microliter
    • Absolute neutrophil count (ANC) >= 1,200/microliter (off-growth factors for 72 hours prior to treatment initiation)
    • Hemoglobin (Hgb) >= 9 g/dL with no blood transfusion within 2 weeks prior to treatment initiation
    • Platelets >= 100,000/microliter with no platelet transfusion within 1 week.

  • Adequate renal and hepatic function as follows:

    • Creatinine clearance (CrCl) >= 50 mL/min/1.73 m^2 (calculated CrCl (Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) or calculated eGFR provided by a laboratory))
    • Total bilirubin <= 1.5 x ULN OR in participants with known or suspected Gilbert's syndrome, total bilirubin <= 3.0 x ULN
    • Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) <= 2.5 x ULN, (unless liver metastases are present, then values must be <= 5 x ULN).
  • Participants serologically positive for hepatitis C virus (HCV) must have an undetectable HCV viral load.
  • Participants serologically positive for Hepatitis B (HBV) core antibody or surface antigen must be on adequate anti-viral therapy and Hepatitis B Viral deoxyribonucleic acid (DNA) load must be <2000 IU/mL.
  • Participants serologically positive for human immunodeficiency virus (HIV) must be on stable antiretroviral therapy for at least 4 weeks before treatment initiation, have no reported opportunistic infections or Castleman s disease within 12 months prior to treatment initiation, have a viral load that is undetectable by quantitative polymerase chain reaction (PCR) and CD4 count >= 200 cells per cubic millimeter.
  • Participants with brain metastasis are eligible if at least 4 weeks status post radiotherapy or surgery before treatment initiation with no evidence of progression or associated symptoms.
  • Individuals of child-bearing potential (IOCBP) must agree to use a highly effective method of contraception (hormonal, intrauterine device (IUD), surgical sterilization) for the duration of the study treatment and up to 9.5 months after the last dose of the ADCT-701 (restriction period).

Individuals who can father children must agree to use an effective method of contraception (barrier, surgical sterilization) at study entry and up to 6.5 months after the last dose of the ADCT-701.

  • Nursing participants must be willing to discontinue nursing from study treatment initiation through 6.5 months after study treatment discontinuation.
  • Participants or legally authorized representative (LAR) must be able to understand and be willing to sign a written informed consent document.

EXCLUSION CRITERIA:

  • Major surgery, prior treatment with chemotherapy, hormonal therapy, immunotherapy, treatment with an investigational agent, and/or radiation therapy within 4 weeks or 5 half-lives, whichever is shorter, prior to treatment initiation.
  • Participants taking any herbal supplements within 14 days prior to treatment initiation.
  • Participants who have wound dehiscence from prior surgeries.
  • Clinically significant third space fluid accumulation (i.e., ascites requiring drainage or any serosal effusion that is either requires drainage or is associated with shortness of breath) at screening.
  • Active infection requiring systemic antibiotic therapy at screening.
  • Active bleeding diathesis or therapeutic anticoagulation with an oral vitamin K antagonist with target international normalized ratio (INR) > 2 at screening.
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to the study drug.
  • An active autoimmune disease. Note: Participants with type 1 diabetes, eczema, vitiligo, alopecia, psoriasis, hypo- or hyperthyroid disease, adrenal insufficiency on systemic oral corticosteroid therapy (<= the equivalent of prednisone 10 mg/day), or other mild autoimmune disorders (Type 1 diabetes, eczema, vitiligo, alopecia, rheumatoid arthritis, psoriasis, systemic lupus erythematosus, adrenal insufficiency due to Addison's disease, hypothyroidisms due to Hashimoto's thyroiditis, hyperthyroidisms due to Graves disease, Sjogren s syndrome, celiac disease, pernicious anemia) not requiring immunosuppressive treatment are eligible.
  • Congenital long QT syndrome, or a corrected QTcF interval of >=480 ms, at screening (unless secondary to the pacemaker or bundle branch block).
  • Active second primary malignancy other than non-melanoma skin cancers, nonmetastatic prostate cancer, in situ cervical cancer, ductal or lobular carcinoma in situ of the breast, or other malignancy that does not require current anticancer treatment per standard of care.
  • Live vaccine administration within 30 days prior to treatment initiation.
  • Pregnant individuals (confirmed by Beta-Human Chorionic Gonadotropin [Beta-HCG] serum or urine pregnancy test) performed at screening.
  • Uncontrolled intercurrent illness that would limit compliance with study requirements.

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: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: 1/Arm1
ADCT-701 given as an IV infusion
Drug: ADCT-701
ADCT-701 in 2microgram/kg-255microgram/kg (weight based dosing), IV over 30 minutes (+15 minutes)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Determine the maximum tolerated dose (MTD) of ADCT-701
Time Frame: cycle 1, days 1-21
Number of dose-limiting toxicities (DLTs) by assessing adverse events (AE) by type and grade of toxicity.
cycle 1, days 1-21

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Safety of ADCT-701
Time Frame: through 30 days after the last ADCT-701 infusion
Adverse Events (AE) by type and grade of toxicity
through 30 days after the last ADCT-701 infusion
Preliminary anti-tumor activity of ADCT-701
Time Frame: up to 5 years
To capture response rate and durations to assess: overall response rate (ORR), duration of response (DOR), progression-free survival (PFS), and overall survival (OS)
up to 5 years
PK profile of ADCT-701
Time Frame: up to 2 years
Assessment of PBD-conjugated antibody, total antibody, and unconjugated warhead SG3199 in blood.
up to 2 years
Immunogenicity of ADCT-701
Time Frame: up to 2 years
Assessment of ADAs using a screening assay for the identification of antibody-positive samples, a confirmation assay, and a titer assessment in blood.
up to 2 years

Collaborators and Investigators

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

Sponsor

National Cancer Institute (NCI)

Investigators

  • Principal Investigator: Jaydira Del Rivero, M.D., National Cancer Institute (NCI)

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Helpful Links

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 (Actual)

June 17, 2024

Primary Completion (Estimated)

October 30, 2027

Study Completion (Estimated)

October 30, 2029

Study Registration Dates

First Submitted

September 15, 2023

First Submitted That Met QC Criteria

September 15, 2023

First Posted (Actual)

September 18, 2023

Study Record Updates

Last Update Posted (Actual)

March 27, 2026

Last Update Submitted That Met QC Criteria

March 26, 2026

Last Verified

March 19, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 10001547
  • 001547-C

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

All IPD recorded in the medical record will be shared with intramural investigators upon request.

IPD Sharing Time Frame

Clinical data will be available during the study and indefinitely.

IPD Sharing Access Criteria

Clinical data will be made available via subscription to BTRIS and with the permission of the study PI

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF

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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