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

  • End date
    Oct 1, 2024
  • participants needed
  • sponsor
    Dana-Farber Cancer Institute
Updated on 24 March 2022
serum pregnancy test
measurable disease
endocrine therapy
neutrophil count
hormone therapy
tumor cells
folic acid
drug combination
mirvetuximab soravtansine
endometrial carcinoma


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


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 as a treatment for any disease.

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

Condition Endometrial Cancer
Treatment Pembrolizumab, IMGN853
Clinical Study IdentifierNCT03835819
SponsorDana-Farber Cancer Institute
Last Modified on24 March 2022


Yes No Not Sure

Inclusion Criteria

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
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
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
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
combination with CDK4/6 inhibitors or mTOR or other PI3K-pathway inhibitors is
ECOG performance status 0 or 1
allowed and does not count as a line of prior therapy
Participants must have normal organ and marrow function as defined below
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
leukocytes ≥3,000/mcL
absolute neutrophil count ≥1,500/mcL
platelets ≥100,000/mcL
hemoglobin ≥ 9.0 g/dL
Time from prior therapy
total bilirubin ≤ 1.5 x institutional upper limit of normal
AST(SGOT)/ALT(SGPT) ≤2.5 × institutional upper limit of normal
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
creatinine ≤ institutional upper limit of normal OR
creatinine clearance ≥40 mL/min/1.73 m2 for participants with creatinine levels above institutional normal
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

Exclusion Criteria

Participants who are receiving any other investigational agents
Required use of folate-containing supplements (e.g. folate deficiency)
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
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)
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
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
Current or prior use of immunosuppressive medication within 7 days prior to enrollment with the following exceptions to this exclusion criterion
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
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)
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
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
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
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Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

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If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

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Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

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