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TerminatedNCT03107780Updated Nov 13, 2025

Testing the Ability of AMG 232 (KRT 232) to Get Into the Tumor in Patients With Brain Cancer

A Phase 1 interventional study of Biospecimen Collection and Magnetic Resonance Imaging in Glioblastoma, Gliosarcoma and MGMT-Unmethylated Glioblastoma, sponsored by National Cancer Institute (NCI). Terminated at 11 sites in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-11-13.

Sponsored by National Cancer Institute (NCI) · Phase 1, Interventional, and Treatment

Why this study was terminated
Drug supply issues
Phase
Phase 1
Study type
Interventional
Enrollment
32
Allocation
Not applicable
Ages
18 Years and older
Sex
All
01

Study summary

This phase I trial studies the side effects and best dose of navtemadlin in treating patients with glioblastoma (brain cancer) that is newly diagnosed or has come back (recurrent). Navtemadlin may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth.

Read the detailed description

PRIMARY OBJECTIVES:

I. Determine the concentration and variability in concentration of navtemadlin (AMG 232 [KRT 232]) in brain and brain-associated tissue in patients with recurrent glioblastoma (GBM). (Part 1) II. Determine the maximum tolerated dose (MTD) of AMG 232 (KRT 232) given in combination with standard radiation following surgery for patients with newly diagnosed GBM harboring unmethylated MGMT promoters and wild-type TP53. (Part 2)

SECONDARY OBJECTIVES:

I. Determine the safety and toxicity of AMG 232 (KRT 232) in patients with recurrent GBM. (Part 1) II. Assess the variability of AMG 232 (KRT 232) concentration in tumor enhancing versus (vs.) infiltrative tissue. (Part 1) III. Assess the pharmacodynamic effect of AMG 232 (KRT 232) on p21 elevation. (Part 1) IV. Determine the safety of AMG 232 (KRT 232) given concurrently with radiation therapy (RT) and adjuvantly as monotherapy for patients with newly diagnosed GBM harboring unmethylated MGMT promoters and wild-type TP53. (Part 2) V. Assess AMG 232 (KRT 232) exposure and correlations with pharmacodynamic (PD) effect on p21 elevation. (Part 2) VI. Assess PD effect on MIC-1 elevation in serum. (Part 2)

OUTLINE: This is a phase 0, intratumoral pharmacokinetic (PK)/PD study of navtemadlin followed by a phase I dose-escalation study.

PART I: Patients with recurrent glioblastoma receive navtemadlin (KRT-232) orally (PO) once daily (QD) for 2 days. Within 3-6 hours of the last dose, patients undergo standard-of-care surgery. Upon recovery (within 45 days), patients with TP53 wild-type tumors continue to receive navtemadlin (KRT-232) PO QD on days 1-7. Cycles repeat every 21 days in the absence of disease progression or unacceptable toxicity. Patients also undergo magnetic resonance imaging (MRI) at baseline as well as on study and/or end of treatment and collection of blood and tissue samples at baseline and on study.

PART II: Within 6 weeks of standard-of-care surgery, patients with newly diagnosed glioblastoma undergo radiation therapy daily during weeks 1-6. Patients also receive navtemadlin (KRT-232) PO 1 time weekly (day 2), 2 times weekly (days 2, 4), 3 times weekly (days 2, 3, 5), 4 times weekly (days 2, 3, 4, 5), or 5 times weekly (days 1-5) for 6 weeks during radiation therapy. Patients also undergo MRI at baseline and end of treatment and collection of blood samples at baseline and on study.

PART II (EXPANSION COHORT): Patients receive navtemadlin (KRT-232) PO QD on days 1-7. Cycles repeat every 21 days in the absence of disease progression or unacceptable toxicity. Patients also undergo MRI at baseline, on study, and end of treatment.

After completion of study treatment, patients are followed every 2 months for the first two years from the off-treatment date, and then every 6 months until 5 years.

02

Conditions studied

  • Glioblastoma
  • Gliosarcoma
  • MGMT-Unmethylated Glioblastoma
  • Recurrent Glioblastoma
03

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Patients must be 18 years of age or older
  • Patients must have a Karnofsky performance status >= 60% (i.e. the patient must be able to care for himself/herself with occasional help from others)
  • Absolute neutrophil count >= 1,500/ul
  • Platelets >= 100,000/ul
  • Hemoglobin >= 10 g/dL (transfuse as necessary to raise levels, no transfusions within 7 days of start)
  • Total bilirubin =\< 1.5 x institutional upper limit of normal (ULN)
  • Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase [SGPT]) =\< 2.5 x institutional ULN
  • Alkaline phosphatase \< 2.0 x ULN
  • Creatinine =\< institutional ULN
  • Creatinine clearance >= 60 ml/min/1.73 m\^2 for patients with creatinine levels above institutional normal
  • Activated partial thromboplastin time (APTT)/partial thromboplastin time (PTT) =\< 1.5 x institutional ULN
  • Patients must be able to provide written informed consent
  • Patients must have MRI within 21 days before starting treatment; patients must be able to tolerate MRI with gadolinium
  • Patients must be maintained on a stable corticosteroid regimen (no increase for 5 days) prior to the baseline MRI
  • Women of childbearing potential must have a negative serum pregnancy test prior to study entry; women of child-bearing potential must agree to use adequate contraception prior to study entry and for the duration of study participation through 5 weeks (women) after receiving the last dose of AMG 232 (KRT 232); should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately; men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of study participation, and 3 months after completion of AMG 232 (KRT 232) administration; adequate methods of effective birth control include sexual abstinence (men, women); vasectomy; or a condom with spermicide (men) in combination with barrier methods, hormonal birth control or intrauterine device (IUD) (women); bilateral tubal ligation (women)
  • Patients must have no concurrent malignancy except curatively treated basal or squamous cell carcinoma of the skin or carcinoma in situ of the cervix, breast, or bladder; patients with prior malignancies must be disease-free for >= five years
  • Patients must be able to swallow oral medications
  • PART 1 PATIENTS (SURGICALLY ELIGIBLE RECURRENT GBM)
  • Part 1 patients must have prior histologically proven glioblastoma that is progressive or recurrent following radiation therapy +/- chemotherapy
  • Part 1 patients must be undergoing repeat surgery that is clinically indicated as determined by their care providers
  • Part 1 patients must have a tumor tissue form indicating availability of archived tissue from initial resection at diagnosis of glioblastoma completed and signed by a pathologist
  • Part 1 patients may have an unlimited number of prior therapy regimens
  • Part 1 patients must have recovered from severe toxicity of prior therapy; the following intervals from previous treatments are required to be eligible:

    • 12 weeks from the completion of radiation
    • 6 weeks from a nitrosourea chemotherapy or mitomycin C
    • 3 weeks from a non-nitrosourea chemotherapy
    • 4 weeks from any investigational (not Food and Drug Administration [FDA]-approved) agents
    • 2 weeks from administration of a non-cytotoxic, FDA-approved agent, except bevacizumab/VEGFR inhibitors (e.g., erlotinib, hydroxychloroquine, etc.)
    • 6 weeks from bevacizumab/VEGFR inhibitors
  • PART 2 PATIENTS (NEWLY DIAGNOSED GBM)
  • Part 2 patients must have histologically confirmed glioblastoma or gliosarcoma
  • Part 2 patients must have recovered from the immediate post-operative period
  • Part 2 patients must have tumor MGMT methylation status of unmethylated; results of routinely used methods for MGMT methylation testing (e.g. mutagenically separated polymerase chain reaction [MSPCR] or quantitative polymerase chain reaction [PCR]) are acceptable
  • Part 2 patient must show evidence of wild-type (WT) p53 status on somatic tissue specimens as assessed by deoxyribonucleic acid (DNA) sequencing
  • Part 2 patients must not have received prior radiation therapy, chemotherapy, immunotherapy or therapy with biologic agent (including immunotoxins, immunoconjugates, antisense, peptide receptor antagonists, interferons, interleukins, tumor infiltrating lymphocytes [TIL], LAK or gene therapy), or hormonal therapy for their brain tumor; glucocorticoid therapy is allowed

Exclusion criteria

Exclusion Criteria:

  • Patients receiving any other investigational agents are ineligible
  • Part 1 patients who have not recovered to \< Common Terminology Criteria for Adverse Events (CTCAE) grade 2 toxicities related to prior therapy are ineligible
  • Patients with a history of hypersensitivity or allergic reactions attributed to compounds of similar chemical or biologic composition to AMG 232 (KRT 232) are ineligible; the AMG 232 (KRT 232) investigator brochure can be referenced for more information
  • Patients on enzyme-inducing anti-epileptic drugs (EIAED) are not eligible for treatment on this protocol; patients may be on non-enzyme inducing anti-epileptic drugs or not be taking any anti-epileptic drugs; patients previously treated with EIAED may be enrolled if they have been off the EIAED for 10 days or more prior to the first dose of AMG 232 (KRT 232)
  • Patients may not use herbal or non-traditional medications while receiving AMG 232 (KRT 232) therapy; all herbal medicines (e.g., St. John's wort), and supplements consumed by the subject within the 30 days prior to receiving the first dose of AMG 232 (KRT 232) should be reviewed by the principal investigator
  • Drugs known to be sensitive CYP3A4 substrates with narrow therapeutic windows (such as alfentanil, astemizole, cisapride, dihydroergotamine, pimozide, quinidine, sirolimus, or terfenadine) are not allowed; patients must be switched to alternative drugs at least 14 days prior to receiving the first dose of AMG 232 (KRT 232); those patients who cannot switch to alternative drugs will be excluded from the study; please note that the list of drugs above is not an exhaustive list; refer to reliable sources such as the FDA website (Drug development and drug interactions), or Micromedex when evaluating potential drug-interactions
  • Treatment with medications known to cause corrected QT (QTc) interval prolongation within 7 days of study day 1 is not permitted unless approved by the sponsor; use of ondansetron is permitted for treatment of nausea and vomiting
  • Patients may not be on warfarin, factor Xa inhibitors and direct thrombin inhibitors; Note: low molecular weight heparin and prophylactic low dose warfarin are permitted; APTT/PTT must meet the inclusion criteria; subjects taking low dose warfarin must have their international normalized ratio (INR) followed closely
  • Patients with uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements, are ineligible; patients with active infection requiring intravenous (IV) antibiotics within 2 weeks of study day 1 are excluded; patients with myocardial infarction within 6 months of study day 1, symptomatic congestive heart failure (New York Heart Association [NYHA] class III and higher), unstable angina, or cardiac arrhythmia requiring medication are excluded
  • Patients with gastrointestinal (GI) tract disease causing the inability to take oral medication, malabsorption syndrome, requirement for intravenous alimentation, prior surgical procedures affecting absorption, uncontrolled inflammatory GI disease (e.g., Crohn's disease, ulcerative colitis), are ineligible
  • Patients with history of bleeding diathesis are ineligible
  • Patients with positive hepatitis B surface antigen (HepBsAg), positive hepatitis total core antibody with negative HBsAG, or detectable hepatitis C virus ribonucleic acid (RNA) by a polymerase-chain reaction (PCR) assay are ineligible (screening is generally done by hepatitis C antibody [HepCAb], followed by hepatitis C virus RNA by PCR if HepCAb is positive)
  • Pregnant women are excluded from this study as no studies evaluating the reproductive toxicity of AMG 232 (KRT 232) have been conducted to date; the teratogenic potential of AMG 232 (KRT 232) in laboratory animals, if any, is unknown; because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with AMG 232 (KRT 232), breastfeeding should be discontinued if the mother is treated with AMG 232 (KRT 232) through 1 week after receiving the last dose of study drug
  • Human immunodeficiency virus (HIV)-positive patients on combination antiretroviral therapy are ineligible because of the potential for pharmacokinetic interactions with AMG 232 (KRT 232); in addition, these patients are at increased risk of lethal infections when treated with marrow-suppressive therapy
  • Patients with a planned use of Novo-TTF (Optune) are ineligible
04

Study design

Phase
Phase 1
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Sequential assignment
Masking
None (open label)
Enrollment
32 participants (actual)

Study arms

  • Experimental
    Treatment (MDM2 inhibitor AMG 232 [KRT-232])

    See Detailed Description

    Procedure: Biospecimen Collection · Procedure: Magnetic Resonance Imaging · Drug: Navtemadlin · Radiation: Radiation Therapy

Interventions

  • ProcedureBiospecimen Collection

    Undergo collection of blood and tissue samples

    Also known as: Biological Sample Collection, Biospecimen Collected, Specimen Collection

  • ProcedureMagnetic Resonance Imaging

    Undergo MRI

    Also known as: Magnetic Resonance, Magnetic Resonance Imaging (MRI), Magnetic resonance imaging (procedure), Magnetic Resonance Imaging Scan, Medical Imaging, Magnetic Resonance / Nuclear Magnetic Resonance, MR, MR Imaging, MRI, MRI Scan, MRIs, NMR Imaging, NMRI, Nuclear Magnetic Resonance Imaging, sMRI, Structural MRI

  • DrugNavtemadlin

    Given PO

    Also known as: (3R,5R,6S)-5-(3-Chlorophenyl)-6-(4-chlorophenyl)-3-methyl-1-((1S)-2-methyl-1-(((1-methylethyl)sulfonyl)methyl)propyl)-2-oxo-3-piperidineacetic Acid, AMG 232, AMG-232, KRT 232, KRT-232, KRT232, MDM2 Inhibitor KRT-232

  • RadiationRadiation Therapy

    Undergo radiation therapy

    Also known as: Cancer Radiotherapy, Energy Type, ENERGY_TYPE, Irradiate, Irradiated, Irradiation, Radiation, Radiation Therapy, NOS, Radiotherapeutics, Radiotherapy, RT, Therapy, Radiation

05

What researchers measure

Primary outcomes

  1. Pharmacokinetics (PK) parameters with target inter-tumor drug concentration at >= 25 nm (Part 1)

    Part 2 of the trial will proceed only if at least one of the doses yielded a 50% PK response rate. If both doses reached 50% PK response rate, both doses will be studied in Part 2 of the trial.

    Time frame: Up to 5 years

  2. Maximum tolerated dose (MTD) of MDM2 inhibitor AMG 232 (KRT-232) when combined with concomitant radiation therapy (Part 2)

    MTD will be determined according to dose-limiting toxicities graded by National Cancer Institute Common Terminology Criteria for Adverse Events version 4.0 (Beginning April 1, 2018 version 5.0 will be utilized for adverse event reporting). The target dose-limiting toxicity (DLT) rate is 33%. If the MTD is not reached among the pre-specified doses, the dose for the expanded cohort will be the highest dose studied for which the DLT rate is less than 33%.

    Time frame: Up to 16 weeks

Secondary outcomes

  1. Incidence of adverse events (Part 1)

    Assessed by Common Terminology Criteria for Adverse Events (CTCAE) version 4.0 (Beginning April 1, 2018 version 5.0 will be utilized for adverse event reporting). Will be used for scoring toxicity and adverse events. The severity and frequency of toxicity will be tabulated by the tested dose or doses, or combination regimens using descriptive statistics. The proportion of patients who experienced grade 3 or above toxicities will be estimated along with 95% confidence intervals by each type of toxicity.

    Time frame: Up to 30 days following the last dose of study drug

  2. Variability of MDM2 inhibitor AMG 232 (KRT-232) concentration in tumor enhancing versus infiltrative tissue (Part 1)

    Will be summarized using descriptive statistics.

    Time frame: Up to 5 years

  3. p21 elevation in tissue (Part 1)

    Will be coded as binary outcome either elevated or not elevated compared to a reference value from archived tumor tissues in matched patient population. A proportion of patients with elevated p21 will be estimated using a binomial distribution along with 95% confidence interval.

    Time frame: Up to 5 years

  4. Incidence of adverse events (Part 2)

    Assessed by CTCAE version 4.0 (Beginning April 1, 2018 version 5.0 will be utilized for adverse event reporting). Will be used for scoring toxicity and adverse events. The severity and frequency of toxicity will be tabulated by the tested dose or doses, or combination regimens using descriptive statistics. The proportion of patients who experienced grade 3 or above toxicities will be estimated along with 95% confidence intervals by each type of toxicity.

    Time frame: Up to 10 weeks

  5. MIC-1 elevation in serum (Part 2)

    The PK variables and changes in MIC-1 will be tabulated and descriptive statistics (e.g., geometric means and coefficients of variation) calculated for each dose level. PK parameters and MIC-1 changes will be compared across dose level using non-parametric statistical testing techniques.

    Time frame: Up to 5 years

  6. MDM2 inhibitor AMG 232 (KRT-232) exposure (Part 2)

    Assessed by liquid chromatography/tandem mass spectrometry. A full pharmacokinetic profile of AMG 232 (KRT 232) will be proposed in this study to assess exposure-response relationships with various pharmacodynamic (PD) endpoints (i.e., MIC-1 changes, toxicity, and efficacy). Correlation with PD effect on p21 elevation will be determined.

    Time frame: Up to 5 years

06

Study locations

11 sites
  • University of Alabama at Birmingham Cancer Center
    Birmingham, Alabama 35233, United States
  • UCLA / Jonsson Comprehensive Cancer Center
    Los Angeles, California 90095, United States
  • Johns Hopkins University/Sidney Kimmel Cancer Center
    Baltimore, Maryland 21287, United States
  • Massachusetts General Hospital Cancer Center
    Boston, Massachusetts 02114, United States
  • Dana-Farber Cancer Institute
    Boston, Massachusetts 02215, United States
  • Henry Ford Hospital
    Detroit, Michigan 48202, United States
  • Memorial Sloan Kettering Cancer Center
    New York, New York 10065, United States
  • Wake Forest University Health Sciences
    Winston-Salem, North Carolina 27157, United States
  • University of Pennsylvania/Abramson Cancer Center
    Philadelphia, Pennsylvania 19104, United States
  • University of Pittsburgh Cancer Institute (UPCI)
    Pittsburgh, Pennsylvania 15232, United States
  • UPMC-Shadyside Hospital
    Pittsburgh, Pennsylvania 15232, United States
07

References and documents

Study documents

  • Informed consent form · Jun 17, 2024

Documents are hosted by the registry — open the source record to download them.

Individual participant data

Plan to share: Yes — NCI is committed to sharing data in accordance with NIH policy. For more details on how clinical trial data is shared, access the link to the NIH data sharing policy page

08

Registry details

Key details

Study ID
NCT03107780
Lead sponsor
National Cancer Institute (NCI)
Responsible party
Sponsor
First posted
Apr 11, 2017
Start date
Jul 9, 2018
Primary completion
Aug 15, 2025
Completion
Aug 15, 2025
Last update
Nov 13, 2025

Study contacts

Eudocia Lee
principal investigator · National Cancer Institute (NCI)

Oversight

Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
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