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Endometrial CancerPhase 2NCT03835819

A Phase 2 Study of Mirvetuximab Soravtansine (IMGN853) and Pembrolizumab in Endometrial Cancer (EC)

A Phase 2 study testing Pembrolizumab and IMGN853 in people with Endometrial Cancer, run by Dana-Farber Cancer Institute at 3 sites in United States.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
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Trial summary

This research study is studying a drug combination as a possible treatment for endometrial cancer. The drugs involved in this study are: mirvetuximab soravtansine (IMGN853) pembrolizumab Read more about this study

Who is it for?
Ages 18 years and older, women only
Conditions the study is for
Endometrial Cancer
What is being tested?
Pembrolizumab and IMGN853
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
18 participants
Where
3 sitesUnited States
Study dates
2 Jan 2020to 1 Feb 2027
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • Women only
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Participants must have advanced or recurrent serous endometrial cancer. Patients with mixed histologies/tumors are eligible if the serous component is the dominant histological subtype. In addition, the tumors must be:
  • microsatellite stable (MSS) as documented by either intact immunohistochemical (IHC) nuclear expression of the mismatch repair genes MSH2, MSH6, MLH1 and PMS2; or microsatelitte stable by polymerase chain reaction (PCR), next generation sequencing, or other CLIA-approved method;
  • AND
  • FRα positive by central immunohistochemistry (IHC, Section 9.1). If archival tissue does not meet FRα criteria, a fresh biopsy tumor sample may be submitted and used to meet this criterium. If a fresh tumor biopsy cannot be done safely the patient will not be allowed to enroll on this study.
  • Participants must have measurable disease as defined by RECIST 1.1. Lesions situated in a previously irradiated area are considered measurable if progression has been demonstrated in such lesions.
  • Prior therapy: Patients must have had one, but no more than three lines of chemotherapy for endometrial carcinoma.
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  • Prior hormonal therapy is allowed (no washout period is required after hormonal therapy) and does not count as a prior line of therapy. Hormonal therapy in combination with CDK4/6 inhibitors or mTOR or other PI3K-pathway inhibitors is allowed and does not count as a line of prior therapy.
  • Prior IO therapy targeted to the PD-1/PD-L1 pathway is allowed in up to 19 patients of the total cohort.
  • Patients must NOT have received prior therapy with any folate receptor ortholog agents.
  • Age 18 or greater years. Because insufficient dosing or adverse event data are currently available on the use of mirvetuximab soravtansine and pembrolizumab in participants <18 years of age, children are excluded. Endometrial cancer is rare in the pediatric population.
  • ECOG performance status 0 or 1
  • Participants must have normal organ and marrow function as defined below:
  • leukocytes ≥3,000/mcL
  • absolute neutrophil count ≥1,500/mcL
  • platelets ≥100,000/mcL
  • hemoglobin ≥ 9.0 g/dL
  • total bilirubin ≤ 1.5 x institutional upper limit of normal
  • AST(SGOT)/ALT(SGPT) ≤2.5 × institutional upper limit of normal
  • creatinine ≤ institutional upper limit of normal OR
  • creatinine clearance ≥40 mL/min/1.73 m2 for participants with creatinine levels above institutional normal.
  • -Time from prior therapy:
  • Systemic anti-neoplastic therapy: 5 half-lives or 4 weeks, whichever is shorter. Hormonal therapy is not considered anti-neoplastic therapy.
  • Radiotherapy: wide-field radiotherapy (e.g. > 30% of marrow-bearing bones) completed at least 4 weeks, or focal radiation completed at least 2 weeks, prior to starting study treatment
  • The effects of agents used in this study on the developing human fetus are unknown. For this reason, women of child-bearing potential must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, during study treatment, and for at least twelve weeks after the last dose of study treatment. Should a woman become pregnant or suspect she is pregnant while she is participating in this study, she should inform her treating physician immediately.
  • Women of child-bearing potential must have a negative serum pregnancy test within 3 days prior to the first dose of study treatment.
  • Ability to understand and the willingness to sign a written informed consent document

Who cannot join

  • Participants who have had chemotherapy within 5 half-lives or 4 weeks (whichever is shorter) or radiotherapy within 2 weeks prior to entering the study. Patients completing wide-field radiotherapy (e.g. >30% of marrow-bearing bones) must not have had treatment within 4 weeks prior to entering study. Participants must have recovered from all AEs due to previous therapy to Grade 1 ≤ or baseline, except alopecia. Participants with endocrine-related AEs who are adequately treated with hormone replacement are eligible.
  • Participants who are receiving any other investigational agents.
  • Participants with prior exposure to IO agents targeting the PD-1/PD-L1 pathway who discontinued therapy due to treatment-related toxicity deemed to be specifically related to IO therapy.
  • Required use of folate-containing supplements (e.g. folate deficiency).
  • Known active CNS metastases and/or carcinomatous meningitis. Participants with previously treated brain metastases may participate provided they are radiologically stable, i.e. without evidence of progression for at least 4 weeks by repeat imaging (note that the repeat imaging should be performed during study screening), clinically stable and without requirement of steroid treatment for at least 14 days prior to first dose of study treatment.
  • History of allergic reactions attributed to compounds of similar chemical or biologic composition to monoclonal antibodies (including antibody drug-conjugates or checkpoint inhibitors).
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  • Uncontrolled intercurrent illness including, but not limited to, any of the following within 6 months of first study treatment: symptomatic congestive heart failure, unstable angina pectoris, uncontrolled hypertension (≥ Grade 3), hypertensive crisis or hypertensive encephalopathy, uncontrolled cardiac arrhythmias, thrombotic or ischemic stroke, clinically-significant vascular disease (e.g. aortic aneurysm, or dissecting aneurysm), severe aortic stenosis, clinically significant peripheral vascular disease, or ≥ Grade 3 cardiac toxicity following prior chemotherapy, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.
  • Active or chronic corneal disorder, including but not limited to the following: Sjogren's syndrome, Fuchs corneal dystrophy (requiring treatment), history of corneal transplantation, active herpetic keratitis, and also active ocular conditions requiring on-going treatment/monitoring such as wet age-related macular degeneration requiring intravitreal injections, active diabetic retinopathy with macular edema, presence of papilledema, and acquired monocular vision.
  • Serious clinically-relevant active infection, including known HIV infection, varicella-zoster virus, cytomegalovirus infection, has a known history of Hepatitis B (defined as Hepatitis B surface antigen [HBsAg] reactive) or known active Hepatitis C virus (defined as HCV RNA is detected) or any other known concurrent infectious disease requiring IV antibiotics with within 2 weeks of study enrollment are ineligible because of the potential for immune side effects.
  • Has received a live vaccine within 30 days prior to the first dose of study drug. Examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, varicella/zoster (chicken pox), yellow fever, rabies, Bacillus Calmette-Guérin (BCG), and typhoid vaccine. Seasonal influenza vaccines for injection are generally killed virus vaccines and are allowed; however, intranasal influenza vaccines (eg, FluMist®) are live attenuated vaccines and are not allowed.
  • Current or prior use of immunosuppressive medication within 7 days prior to enrollment with the following exceptions to this exclusion criterion:
  • Intranasal, inhaled, topical steroids, or local steroid injections (eg, intra-articular injection);
  • Systemic corticosteroids at physiologic doses not to exceed 10 mg/day of prednisone or equivalent;
  • Steroids as premedication for hypersensitivity reactions (eg, CT scan premedication).
  • Active autoimmune disease that might deteriorate when receiving an immunostimulatory agent. Patients with diabetes type I, vitiligo, psoriasis, hypo-or hyperthyroid disease not requiring immunosuppressive treatment are eligible.
  • Has a history of (non-infectious) pneumonitis that required steroids or has current pneumonitis.
  • Pregnant or nursing women are excluded from this study because effects of agents used in this study on infants or the developing human fetus are unknown
  • Presence of other malignancies unless they are considered cured by patient's oncologist

Trial locations and contacts

3 sites in 1 country.

United States3 sites
  • Dana Farber Cancer Institute

    Boston, Massachusetts, 02215

  • Northwell Cancer Institute

    Lake Success, New York, 11042

  • University of Massachusetts

    Worcester, Massachusetts, 01605

Other trials in United States

About this study

Official title: A Phase 2, Two-stage, Study of Mirvetuximab Soravtansine (IMGN853) in Combination With Pembrolizumab in Patients With Microsatellite Stable (MSS) Recurrent or Persistent Endometrial Cancer (EC)

This research study is studying a drug combination as a possible treatment for endometrial cancer.

The drugs involved in this study are:

  • mirvetuximab soravtansine (IMGN853)
  • pembrolizumab
Read the detailed description

This research study is a Phase II clinical trial. Phase II clinical trials test the safety and effectiveness of an investigational drug to learn whether the drug works in treating a specific disease. "Investigational" means that the drug is being studied.

The FDA (the U.S. Food and Drug Administration) has not approved mirvetuximab soravtansine for this specific disease but it has been approved for other uses.

The FDA (the U.S. Food and Drug Administration) has not approved pembrolizumab for this specific disease but it has been approved for other uses.

In this research study, the investigators are studying the combination of mirvetuximab soravtansine and pembrolizumab. Pembrolizumab is an immunotherapy that activates a patient's own immune system to recognize and kill tumor cells. Pembrolizumab by itself may not be enough to kill cancer cells in all people with cancer. In this study, all patients will receive mirvetuximab soravtansine and pembrolizumab. Mirvetuximab soravtansine is an antibody-drug conjugate. That is a type of agent that attaches a chemotherapy drug to a molecule that binds a protein on the outside of cancer cells. The protein targeted by mirvetuximab soravtansine is called folate receptor-alpha (FRα). FRα is expressed on the surface of certain cancers, including endometrial cancer cells. Mirvetuximab soravtansine is expected to kill cancer cells by delivering chemotherapy to cells that have high levels of FRα. To participate in this study, a sample of your tumor was previously tested, and was found to have high levels of FRα. Mirvetuximab soravtansine also may also active immune cells and improve the response to immunotherapies like pembrolizumab.

In this study, the investigators expect to learn whether the combination of pembrolizumab and mirvetuximab soravtansine can shrink endometrial cancers or prevent their growth for at least 6 months. The investigators will also learn more about the side effects patients experience who receive this treatment. The investigators also plan to learn more about which patients are likely to benefit from this treatment

Being tested
Pembrolizumab, IMGN853
Keywords
Endometrial Cancer
Medical subject headings
Endometrial Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • PembrolizumabDrug

    Also called Keytruda

    Pembrolizumab is an immunotherapy that activates a patient's own immune system to recognize and kill tumor cells

  • IMGN853Drug

    Also called Mirvetuximab soravtansine, Elahere

    Mirvetuximab soravtansine is an antibody-drug conjugate.

Study groups in NCT03835819
Study groupRoleWhat they receive
IMGN853 + PembrolizumabExperimental* Pembrolizumab is administered intravenously once every 3 weeks * IMGN853 is administered intravenously once every 3 weeks
Receives: Drug: Pembrolizumab; Drug: IMGN853

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Objective Response Rate

    The objective response rate was determined by the frequency of patients who had objective tumor response, determined per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1) for target lesions and assessed by CT or MRI, where objective response represents either a confirmed complete response (CR; disappearance of all target lesions) or a confirmed partial response (PR; at least a 30% decrease in the sum of the longest diameter of target lesions, taking as reference the baseline sum diameters); objective response = CR + PR. The ORR is therefore reported as the percentage of participants who achieved a CR or PR per RECIST v1.1.

    Measured: 6 months

  2. Progression-Free Survival at 6 Months (PFS6)

    Progression-free survival at 6 months was determined by the frequency of patients who survived progression-free for at least 6 months after initiating study treatment by Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1), where disease progression represents at least a 20% increase in the sum of diameters of target lesions, appearance of one or more new lesions, or unequivocal progression of existing non-target lesions.

    Measured: 6 months

Secondary outcomes (3)
  1. Progression-free Survival

    Progression-free survival was determined per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1), where disease progression represents at least a 20% increase in the sum of diameters of target lesions, appearance of one or more new lesions, or unequivocal progression of existing non-target lesions. The distribution of progression-free times will be estimated using Kaplan-Meier analysis.

    Measured: Interval from start of treatment to documented disease progression per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 or death from any cause, whichever occurs first.

  2. Overall Survival

    Overall survival (OS) is defined as the time from registration to death due to any cause, or censored at date last known alive. The distribution of overall survival times will be estimated using Kaplan-Meier analysis.

    Measured: Participants are followed for survival status from registration through up to 3 years after removal from study intervention

  3. Duration of Response

    Duration of response (DoR) is defined as time from best overall response to the time of disease progression.

    Measured: Interval from best overall response to documented disease progression per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 or death from any cause, whichever occurs first.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted11 Feb 2019
  2. Study start2 Jan 2020
  3. Primary completion4 Jun 2024
  4. Study completion1 Feb 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
18 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT03835819
Sponsor's protocol ID
18-602
Status last verified
May 2026
First submitted
6 Feb 2019
Last updated
1 Jun 2026
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Yes: The Dana-Farber / Harvard Cancer Center encourages and supports the responsible and ethical sharing of data from clinical trials. De-identified participant data from the final research dataset used in the published manuscript may only be shared under the terms of a Data Use Agreement. Requests may be directed to: \[contact information for Sponsor Investigator or designee\]. The protocol and statistical analysis plan will be made available on Clinicaltrials.gov only as required by federal regulation or as a condition of awards and agreements supporting the research

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Pembrolizumab and IMGN853 in people with Endometrial Cancer, run by Dana-Farber Cancer Institute at 3 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 26 inclusion and 18 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: under way, not looking for participants, as of the sponsor's last update on 1 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 3 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 15 May 2025). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Objective Response Rate (time frame: 6 months). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 1 Jun 2026.

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