A Study of XMT-1660 in Participants With Solid Tumors

NCT ID: NCT05377996

Last Updated: 2025-10-28

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

PHASE1

Total Enrollment

319 participants

Study Classification

INTERVENTIONAL

Study Start Date

2022-08-15

Study Completion Date

2027-05-31

Brief Summary

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A Study of XMT-1660 in Solid Tumors

Detailed Description

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This first-in-human (FIH) study will test the safety and side effects of a drug called XMT-1660. A side effect is anything a drug does to the body besides treating the disease.

Participants in the study will have cancer that has come back after a period of time during which the cancer could not be detected (recurrent), spread in the body near where it started (advanced) or spread through the body (metastatic).

The study will have two parts. The first part called Dose Escalation will find out how much XMT-1660 should be given to participants. The second part called Dose Expansion will use the dose found in the first part to find out how safe XMT-1660 is and if it works to treat solid tumor cancers.

Conditions

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Triple Negative Breast Cancer Breast Cancer Endometrial Cancer Ovarian Cancer Fallopian Tube Cancer Primary Peritoneal Cavity Cancer Adenoid Cystic Carcinoma

Study Design

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Allocation Method

NA

Intervention Model

SINGLE_GROUP

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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XMT-1660

Single arm XMT-1660 alone (monotherapy)

Group Type EXPERIMENTAL

XMT-1660

Intervention Type DRUG

XMT-1660 will be administered through a vein in your arm or port catheter (intravenously)

Interventions

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XMT-1660

XMT-1660 will be administered through a vein in your arm or port catheter (intravenously)

Intervention Type DRUG

Eligibility Criteria

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Inclusion Criteria

* Recurrent or advanced solid tumor and has disease
* Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1
* Participants in DES must have at least one non-target lesion as defined by RECIST version 1.1. Participants in Backfill Cohorts and EXP must have at least one measurable disease (target) lesion as defined by RECIST version 1.1.
* Tumor tissue, either archival or from a fresh tumor biopsy, available for testing or be willing to undergo a minimally invasive tumor biopsy to obtain tumor tissue for local testing, if not medically contraindicated, prior to Cycle 1 Day 1
* Brain magnetic resonance imaging (MRI) during the Screening period unless obtained within 30 days prior to Screening (based on standard clinical care), if they meet either of the following criteria:

1. All participants with TNBC
2. Participants with a history of brain metastases or with neurologic symptoms or signs suspicious for brain metastases.

Exclusion Criteria

* Prior treatment with an Antibody Drug Conjugate (ADC) containing an auristatin payload. Prior treatment with another ADC containing other payloads is allowed.
* Major surgery within 28 days of starting study treatment, systemic anticancer therapy within the time period of 28 days or 5 half-lives of the prior therapy before starting study treatment (14 days or 5 half-lives for small molecule targeted therapy), whichever is less, or palliative radiation therapy to the chest within 3 months of starting study treatment or to other anatomic sites within 14 days of starting study treatment.
* Diagnosis of additional malignancy that required active treatment (including surgery, systemic therapy, and radiation) within 2 years prior to screening, except for adequately treated basal cell or squamous cell skin cancer, or carcinoma in situ of the breast or of the cervix.
* Untreated CNS metastases (including new and progressive brain metastases), history of leptomeningeal metastasis or carcinomatous meningitis.
* Prior B7-H4 targeted treatment.
* History of cirrhosis, hepatic fibrosis, esophageal or gastric varices, or other clinically significant liver diseases.
* Current severe, uncontrolled systemic disease (e.g. clinically significant cardiovascular, pulmonary, or metabolic disease) or intercurrent illness that could increase the risk of serious adverse events (SAEs) or interfere with per-protocol evaluations, in the judgment of either the Sponsor or the Investigator.
* Clinically significant cardiovascular disease
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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Mersana Therapeutics

INDUSTRY

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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Robert Burger, MD

Role: STUDY_DIRECTOR

Mersana Therapeutics

Locations

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Mayo Clinic Comprehensive Cancer Center

Phoenix, Arizona, United States

Site Status RECRUITING

UC Irvine Health-Chao Family Comprehensive Cancer Center

Orange, California, United States

Site Status RECRUITING

UCSF Helen Diller Family Comprehensive Cancer Center

San Francisco, California, United States

Site Status RECRUITING

UCLA

Santa Monica, California, United States

Site Status RECRUITING

Mayo Clinic - Jacksonville

Jacksonville, Florida, United States

Site Status RECRUITING

Florida Cancer Specialists

Sarasota, Florida, United States

Site Status RECRUITING

Moffitt Cancer Center

Tampa, Florida, United States

Site Status RECRUITING

Winship Cancer Institute, Emory University

Atlanta, Georgia, United States

Site Status RECRUITING

Northwestern University

Chicago, Illinois, United States

Site Status RECRUITING

Beth Israel Deaconess Medical Center

Boston, Massachusetts, United States

Site Status RECRUITING

Dana-Farber Cancer Institute

Boston, Massachusetts, United States

Site Status RECRUITING

Henry Ford Health Hospital

Detroit, Michigan, United States

Site Status RECRUITING

Mayo Clinic - Rochester

Rochester, Minnesota, United States

Site Status RECRUITING

Comprehensive Cancer Centers of Nevada

Las Vegas, Nevada, United States

Site Status RECRUITING

New York University Langone Health

New York, New York, United States

Site Status RECRUITING

ICHAN School of Medicine at Mount Sinai

New York, New York, United States

Site Status NOT_YET_RECRUITING

Memorial Sloan Kettering Cancer Center

New York, New York, United States

Site Status RECRUITING

Stephenson Cancer Center Oklahoma University Health

Oklahoma City, Oklahoma, United States

Site Status RECRUITING

Avera Cancer Institute

Sioux Falls, South Dakota, United States

Site Status RECRUITING

Tennessee Oncology, PLLC

Nashville, Tennessee, United States

Site Status RECRUITING

Texas Oncology, P.A.

Dallas, Texas, United States

Site Status RECRUITING

MD Anderson

Houston, Texas, United States

Site Status RECRUITING

Huntsman Cancer Institute

Salt Lake City, Utah, United States

Site Status RECRUITING

NEXT Oncology Virginia

Fairfax, Virginia, United States

Site Status RECRUITING

Fred Hutchinson Cancer Center

Seattle, Washington, United States

Site Status RECRUITING

Summit Cancer Centers

Spokane, Washington, United States

Site Status RECRUITING

Countries

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United States

Central Contacts

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Caroline Rogalski

Role: CONTACT

1-617-715-8214

Facility Contacts

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Felipe Batalini, MD

Role: primary

Ritesh Parajuli

Role: primary

Laura Huppert, MD

Role: primary

Nicholas McAndrew, MD

Role: primary

Pooja Advani, MD

Role: primary

Judy Wang

Role: primary

Hyo Han, MD

Role: primary

Kevin Kalinsky, MD

Role: primary

Patricia Robinson, MD

Role: primary

Gerburg Wulf, MD

Role: primary

Antonio Giordano, MD, PhD

Role: primary

Amy Weise, MD

Role: primary

Roberto Leon-Ferre, MD

Role: primary

Liawaty Ho, MD

Role: primary

Nancy Chan, MD

Role: primary

Amy Tiersten

Role: primary

Nour Abuhadra, MD

Role: primary

Debra Richardson, MD

Role: primary

David C. Starks, MD

Role: primary

Erika P Hamilton, MD

Role: primary

Funda Meric-Bernstam

Role: primary

Kristen Kelley, MD

Role: primary

Alex Spira, MD, PhD

Role: primary

Natasha Hunter, MD

Role: primary

Arvind Chaudhry, MD, PhD

Role: primary

References

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Toader D, Fessler SP, Collins SD, Conlon PR, Bollu R, Catcott KC, Chin CN, Dirksen A, Du B, Duvall JR, Higgins S, Kozytska MV, Bellovoda K, Faircloth C, Lee D, Li F, Qin L, Routhier C, Shaw P, Stevenson CA, Wang J, Wongthida P, Ter-Ovanesyan E, Ditty E, Bradley SP, Xu L, Yin M, Yurkovetskiy AV, Mosher R, Damelin M, Lowinger TB. Discovery and Preclinical Characterization of XMT-1660, an Optimized B7-H4-Targeted Antibody-Drug Conjugate for the Treatment of Cancer. Mol Cancer Ther. 2023 Sep 5;22(9):999-1012. doi: 10.1158/1535-7163.MCT-22-0786.

Reference Type DERIVED
PMID: 37294948 (View on PubMed)

Other Identifiers

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MER-XMT-1660-1

Identifier Type: -

Identifier Source: org_study_id

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