Phase I Trial of Adagrasib (MRTX849) in Combination With Cetuximab and Irinotecan in Patients With Colorectal Cancer

M.D. Anderson Cancer Center (Other)
Overall Status
Not yet recruiting ID
Mirati Therapeutics (Other)

Study Details

Study Description

Brief Summary

To find the recommended dose of MRTX849 that can be given in combination with cetuximab and irinotecan to patients with colorectal cancer that have a mutation (genetic change) called KRAS G12C.

Condition or Disease Intervention/Treatment Phase
Phase 1

Detailed Description

Primary objectives:
  • To determine the optimal biological dose (OBD) of MRTX849 when used in combination with cetuximab and irinotecan.

  • To evaluate the safety profile of this combination.

  • To determine the antitumor activity of this combination in patients with metastatic KRASG12C colorectal cancer.

Exploratory objectives:
  • To explore correlations between MRTX849 exposure and patient outcomes such as disease response, objective response rate (ORR), duration or response (DOR), progression-free survival (PFS), overall survival (OS), safety, and pharmacodynamic endpoints.

  • To evaluate the utility of detecting KRASG12C mutation in plasma to identify suitable patients.

  • To explore potential pharmacodynamic (PD) markers of KRASG12C and EGFR inhibition in tumor tissue and/or blood plasma.

  • To explore correlations between baseline tumor biomarkers, gene alterations, and clinical activity/efficacy.

  • To define mechanisms of acquired resistance to EGFR and KRASG12C inhibition and evaluate novel strategies to overcome such resistance.

  • To assess pharmacokinetics of MRTX849 and irinotecan and key metabolites.

Study Design

Study Type:
Anticipated Enrollment :
24 participants
Intervention Model:
Single Group Assignment
None (Open Label)
Primary Purpose:
Official Title:
Phase I Trial of Adagrasib (MRTX849) in Combination With Cetuximab and Irinotecan in Patients With Colorectal Cancer
Anticipated Study Start Date :
Jul 31, 2023
Anticipated Primary Completion Date :
Sep 30, 2025
Anticipated Study Completion Date :
Sep 30, 2027

Arms and Interventions

Arm Intervention/Treatment
Experimental: Stage 1 ( MRTX849 and Irinotecan)

Participants assigned to Stage 1, participants dose levels of MRTX849 and irinotecan will depend on when the participants joined the study. This study will also test 2 different dosing schedules: concurrent dosing or staggered dosing

Drug: MRTX849
Given by PO (mouth)

Drug: Irinotecan
Given by IV (vein)

Drug: Cetuximab
Given by IV (vein)
Other Names:
  • C225
  • Erbitux™
  • MC-C225
  • MOAB C225
  • Experimental: Stage 2 ( MRTX849 and Irinotecan)

    Participants assigned to Stage 2 will receive MRTX849 and irinotecan at the dose level that was recommended during Stage 1. This study will also test 2 different dosing schedules: concurrent dosing or staggered dosing

    Drug: MRTX849
    Given by PO (mouth)

    Drug: Irinotecan
    Given by IV (vein)

    Drug: Cetuximab
    Given by IV (vein)
    Other Names:
  • C225
  • Erbitux™
  • MC-C225
  • MOAB C225
  • Outcome Measures

    Primary Outcome Measures

    1. Incidence of Adverse Events, Graded According to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) [through study completion; an average of 1 year.]

    Eligibility Criteria


    Ages Eligible for Study:
    18 Years and Older
    Sexes Eligible for Study:
    Accepts Healthy Volunteers:
    Inclusion Criteria:
    • Histologically confirmed diagnosis of adenocarcinoma of the colon or rectum with KRASG12C mutation. KRASG12C on ctDNA may also be used as basis of eligibility, with approval from study or site PIs.

    • Unresectable or metastatic disease.

    • Previously treated with at least two prior chemotherapy regimens for metastatic disease (where a regimen is defined as a unique combination of 5-FU, oxaliplatin, irinotecan, bevacizumab (or biosimilar), capecitabine). A treatment with adjuvant therapy with progression within 6 months of completing therapy would be considered a prior chemotherapy regimen.

    • Presence of tumor lesions to be evaluated per RECIST 1.1patients must have measurable disease.

    • Age ≥ 18 years. Because no dosing or adverse event data are currently available on the use of the proposed combination in patients <18 years of age, and because solid tumor malignancies with KRASG12C mutation is rare among patients < 18 years of age, children are excluded from this study.

    • Able to take oral medications.

    • Most recent prior systemic therapy (e.g., chemotherapy, immunotherapy or, investigational agent) and radiation therapy discontinued at least 2 weeks before first dose or five half-lives whichever is shorter.

    • Recovery from the adverse effects of prior therapy at the time of enrollment to ≤ Grade 1 (excluding alopecia and prior oxaliplatin-induced neuropathy).

    • Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.

    • Laboratory values within the screening period:

    • Absolute neutrophil count ≥ 1,000/mm3 (≥ 1.0, 109/L)

    • Platelet count ≥ 100,000/mm3 (≥ 100, 109/L)

    • INR/PTT ≤ 1.5 upper limit of normal (ULN)

    • Hemoglobin ≥ 9 g/dL, in the absence of transfusions for at least 2 weeks

    • Total bilirubin ≤ 1.5 upper limit of normal (ULN) (if associated with Gilbert's disease or UGT1A1*28 homozygosity, ≤ 3 ULN)

    • Aspartate transaminase (AST) and alanine transaminase (ALT) ≤ 2.5 ULN (if associated with liver metastases ≤5 ULN)

    • Estimated creatinine clearance ≥ 60 mL/min by Cockcroft-Gault or CKD-EPI.

    • Women of child-bearing potential or men whose partner is a woman of child-bearing potential agree to use contraception while participating in this study, and for 6 months following termination of study treatment.

    • Completed informed consent process, including signing of IRB-approved informed consent form.

    • Willing and able to comply with clinical trial instructions and requirements.

    Exclusion criteria:
    • Active brain metastases, unless adequately treated and patient is neurologically stable (except for residual symptoms of central nervous system treatment) for at least 2 weeks prior to enrollment without corticosteroids or are on a stable or decreasing dose of ≤ 10 mg daily prednisone (or equivalent).

    • Prior treatment with KRASG12C inhibitor + EGFR inhibitor combo

    • Patients with carcinomatous meningitis.

    • History of significant hemoptysis or hemorrhage within 4 weeks of the first dose, unless resolved or stable.

    • Major surgery within 4 weeks of first dose.

    • History of intestinal disease or major gastric surgery likely to alter absorption of study treatment.

    • Any of the following cardiac abnormalities:

    • Symptomatic or uncontrolled atrial fibrillation or other arrhythmia

    • Unstable angina pectoris or myocardial infarction within the last 6 months.

    • Congestive heart failure ≥ NYHA Class 3 within the last 6 months.

    • QTc > 480 milliseconds.

    • LVEF, if known, beyond the allowable window for single-agent MRTX849

    • Ongoing need for a medication with any of the following characteristics that cannot be switched to alternative treatment prior to study entry (see Appendix 2): known risk of Torsades de Pointes or QT prolongation; substrate of CYP3A with narrow therapeutic index; strong inducer or inhibitor of CYP3A and/or P-gp; strong inhibitor of BCRP; and proton pump inhibitors.

    • Known or suspected presence of another malignancy that could be mistaken for the malignancy under study.

    • Known human immunodeficiency virus (HIV) seropositivity or active Hepatitis B or C. Patients treated for hepatitis C with no detectable viral load are permitted.

    • Pregnancy. Women of child-bearing potential must have a negative serum or urine pregnancy test during screening.

    • Breast-feeding or planning to breast feed during the study or within 6 months after end of treatment.

    • Any serious illness, uncontrolled inter-current illness, psychiatric illness, active or uncontrolled infection, or other medical history, including laboratory results, which, in the investigator's opinion, would be likely to interfere with the patient's participation in the study, or with the interpretation of results.

    Contacts and Locations


    Site City State Country Postal Code
    1 M D Anderson Cancer Center Houston Texas United States 77030

    Sponsors and Collaborators

    • M.D. Anderson Cancer Center
    • Mirati Therapeutics


    • Principal Investigator: David S. Hong, MD, M.D. Anderson Cancer Center

    Study Documents (Full-Text)

    None provided.

    More Information

    Additional Information:


    None provided.
    Responsible Party:
    M.D. Anderson Cancer Center Identifier:
    Other Study ID Numbers:
    • 2022-0374
    • NCI-2023-01157
    First Posted:
    Feb 10, 2023
    Last Update Posted:
    Feb 10, 2023
    Last Verified:
    Feb 1, 2023
    Studies a U.S. FDA-regulated Drug Product:
    Studies a U.S. FDA-regulated Device Product:
    Additional relevant MeSH terms:

    Study Results

    No Results Posted as of Feb 10, 2023