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Anti-PD-1 +/- RT for MSI-H Solid Tumors

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT04001101
Recruitment Status : Withdrawn (PI has decided to withdraw the study)
First Posted : June 27, 2019
Last Update Posted : November 30, 2021
National Cancer Institute (NCI)
Cancer League of Colorado
Information provided by (Responsible Party):
University of Colorado, Denver

Brief Summary:
To determine if the out-of-field ORR is improved with the addition of radiation therapy to anti-PD-1 for patients with MSI-H/dMMR metastatic solid tumors. Determine the rates of in-field tumor control, disease control (stable disease, partial response, complete response), durability of disease response, progression-free survival, overall survival, and to assess quality of life and toxicity. Determine the chronology and profile of the radiation-associated immune response.

Condition or disease Intervention/treatment Phase
Microsatellite Instability High Mismatch Repair Deficiency Colorectal Cancer Combination Product: RT and Anti-PD-1 Drug: Anti-PD-1 Phase 2

Detailed Description:
This is a randomized phase II study with a primary objective to compare the objective response rate (ORR) for anti-PD-1 therapy alone versus anti-PD-1 therapy and limited metastatic site radiation, in patients with microsatellite instability-high (MSI-H) or mismatch repair deficient (dMMR) metastatic solid tumors. The anti-PD-1 agent, pembrolizumab, received recent FDA accelerated approval for the use in patients with metastatic MSI-H or dMMR solid tumors that have progressed following prior treatment or without satisfactory alternative treatment options. FDA approval for pembrolizumab was based on the results of five multi-cohort, multi-center, single-arm trials, which together showed an ORR of 39.6% among 149 patients with MSI-H/dMMR cancers. Importantly, there is mounting preclinical and clinic evidence supporting the safety and efficacy of combining radiation therapy with systemic immunotherapy, although no prospective comparative data, to the best of our knowledge. In this study, the investigators will focus on patients with MSI-H/dMMR tumors, given their baseline responsiveness to immune checkpoint inhibition, and test the hypothesis that ORR will be improved with radiation and anti-PD-1 therapy compared to anti-PD-1 therapy alone, through a randomized phase II trial design.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 0 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double (Investigator, Outcomes Assessor)
Masking Description: In an effort to minimize bias, the study will utilize a randomization. The randomization list will be generated by the study biostatistician and provided only to the study personnel who will be responsible for assigning each subject to a cohort of the study.
Primary Purpose: Treatment
Official Title: A Randomized Phase II Study of Anti-PD-1 and Limited Metastatic Site Radiation Therapy Versus Anti-PD-1 Alone for Patients With Microsatellite Instability-high (MSI-H) and Mismatch Repair Deficient (dMMR) Metastatic Solid Tumors
Actual Study Start Date : October 10, 2019
Actual Primary Completion Date : November 17, 2021
Actual Study Completion Date : November 17, 2021

Arm Intervention/treatment
Active Comparator: RT and Anti-PD-1

In the pembrolizumab + RT arm, pembrolizumab will be started on study within 7 days (+/- 7 days) of start of RT.

Pembrolizumab will be given as standard of care in both arms

Combination Product: RT and Anti-PD-1
limited metastatic site radiation

Placebo Comparator: Anti-PD-1
anti-PD-1 therapy alone Pembrolizumab will be given as standard of care in both arms
Drug: Anti-PD-1
anti-PD-1 therapy alone

Primary Outcome Measures :
  1. Out-of-field ORR improvement [ Time Frame: 12 months ]
    • Out-of-field objective response rate (ORR: CR+PR) according to RECIST 1.1 assessment

Secondary Outcome Measures :
  1. in-field tumor control and disease control [ Time Frame: 12 Months ]
    In-field tumor control and disease control will be defined as SD, PR, or CR, of the target lesion, by RECIST 1.1 criteria

  2. Determine the chronology and profile of the radiation-associated immune response. [ Time Frame: 12 months ]
    The University of Colorado School of Medicine Human Immune Monitoring Shared Resource (HIMSR) will quantify peripheral CD8, CD4, and regulatory T cell populations and characterize the relative functional state of these cells using activation markers (CD45RO, ICOS, and CD25) and inhibitory markers (TIM-3, CTLA-4, LAG-3, and PD-1). The HIMSR will also characterize peripheral dendritic cells (pDCs, CD1c+, and CD141+ subsets), monocytes (classical and non-classical subsets), myeloid-derived suppressor cells (MDSCs, granulocytic and monocytic subsets), and expression of activation (CD80 and HLA-DR) and inhibitory molecules (PDL1) on these cells. Further, cytokine production by NK cells, B cells, T cells, and monocytes will be measured by flow cytometry after brief ex-vivo stimulation. The HIMSR will also perform a protein multiplex array of 40 potential biomarkers in plasma.

  3. Durability of disease response [ Time Frame: 12 months ]
    In patients that achieve an objective response to pembrolizumab +/- RT, durability of response will be measured from the initiation of pembrolizumab until PD.

  4. Progression-free Survival [ Time Frame: 12 months ]
    Progression-free survival will be measured from the date of initiation of pembrolizumab to the time of tumor progression or death from any cause for one year.

  5. Overall Survival [ Time Frame: 12 Months ]
    Overall survival will be measured from the date of initiation of pembrolizumab to the time of death from any cause for one year.

  6. Quality of life score [ Time Frame: 12 Months ]
    Quality of life questionnaire, 28 questions rating experience from 1 to 4 (4 being "very much", 1 being "not at all") and two questions rating overall health and quality of life on a scale from 1 to 7 (7 being excellent)

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 100 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Provision to sign and date the consent form.
  2. Stated willingness to comply with all study procedures and be available for the duration of the study.
  3. Adult patients, 18-100 years of age.
  4. ECOG 0 or 1.
  5. Unresectable or metastatic MSI-H/dMMR tumors eligible to receive pembrolizumab according to FDA-approved indications:

    • Solid tumors that have progressed following prior treatment and who have no satisfactory alternative treatment options OR
    • Colorectal cancer that has progressed following treatment with a fluoropyrimidine, oxaliplatin, and irinotecan11
  6. Confirmation from medical or gynecologic oncology that the patient is eligible to receive pembrolizumab per FDA-approved indication for patients not currently receiving pembrolizumab .
  7. At least one site of disease amenable to radiation therapy per the acceptable dosing regimens outlined in section 6.2, and at least one additional site of measurable disease suitable for out-of-field response assessment.
  8. Adequate baseline labs for initiation of trial treatment:

    • absolute neutrophil count (ANC) >1,000/µL
    • platelets >75,000/µL
    • hemoglobin >8 g/dL
    • serum creatinine < 1.5 x ULN
    • serum total bilirubin < 1.5 x ULN
    • AST and ALT < 2.5 x ULN, or < 5 x ULN if liver metastasis are present

Exclusion Criteria:

  1. Pregnant women. Pregnancy testing is required for all female subjects of childbearing potential.
  2. Patients with active collagen vascular disease (CVD), specifically systemic lupus erythematosus or scleroderma. Patients with a history of CVD without evidence of active disease are eligible for enrollment at the discretion of the study PI.
  3. History of immunodeficiency, hypersensitivity to pembrolizumab, or other medical contraindication to receipt of pembrolizumab.
  4. Active infection.
  5. Active CNS metastases. Patients with treated CNS metastases are eligible.
  6. Patients with a separate non-cutaneous cancer diagnosis for which the patient has not been without evidence of disease for at least 5 years.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04001101

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United States, Colorado
University of Colorado Hospital
Denver, Colorado, United States, 80045
Sponsors and Collaborators
University of Colorado, Denver
National Cancer Institute (NCI)
Cancer League of Colorado
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Responsible Party: University of Colorado, Denver
ClinicalTrials.gov Identifier: NCT04001101    
Other Study ID Numbers: 19-0556.cc
P30CA046934 ( U.S. NIH Grant/Contract )
First Posted: June 27, 2019    Key Record Dates
Last Update Posted: November 30, 2021
Last Verified: November 2021
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Product Manufactured in and Exported from the U.S.: No
Keywords provided by University of Colorado, Denver:
Solid tumor
Colorectal cancer
Unresectable or metastatic
Additional relevant MeSH terms:
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Colorectal Neoplasms
Microsatellite Instability
Intestinal Neoplasms
Gastrointestinal Neoplasms
Digestive System Neoplasms
Neoplasms by Site
Digestive System Diseases
Gastrointestinal Diseases
Colonic Diseases
Intestinal Diseases
Rectal Diseases
Genomic Instability
Pathologic Processes