Phase 1/1b Study of IAM1363 for HER2-Altered Cancers

This study is testing a new drug called IAM1363 for people with advanced cancers that have changes in a protein called HER2. This includes HER2-positive breast cancer and other HER2-altered tumors, even those that have spread to the brain. Researchers want to see how safe IAM1363 is and if it helps shrink tumors. You might receive IAM1363 alone or in combination with other approved cancer medicines like capecitabine, trastuzumab, zanidatamab, T-Dxd, or pembrolizumab (sometimes with carboplatin and pemetrexed). To join, your cancer must have a HER2 alteration, have progressed after previous treatments, and be measurable on scans. The study will look at side effects and how the drug moves through your body.

Study design
This is a Phase 1/1b study, meaning it's an early-stage study to find the right dose and check for safety, and it is open-label, so you and your doctors will know which treatment you are receiving. It plans to enroll up to 383 participants across multiple centers.
What's involved
Not specified in the trial record.
Compensation
Not stated in the trial record.
Follow-up
Your health will be monitored for side effects for up to 30 days after your last dose of study drug, and drug levels in your body will be measured for up to 42 days.

AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.

NCT06253871

A Phase 1/1b Study of IAM1363 in HER2 Cancers

Recruiting
PHASE1Ages 18+InterventionalTreatment
Iambic Therapeutics, Inc
~383 participants
Updated 2026-06-04 on ClinicalTrials.gov
What's tested:IAM1363

At a glance

Recruiting sites
53 of 53 listed sites are recruiting right now
RecruitingSuspended, closed, or not yet open
What they're measuring
Incidence and severity of dose limiting toxicities (DLTs) (Part 1 only)
Measured over 21 days
+7 more outcomes measured
HER2 Mutation-Related Tumors
HER2
HER2-positive Breast Cancer
HER2 + Breast Cancer
Brain Metastases From Solid Tumors
Brain Metastases From HER2 and Breast Cancer
CNS Metastases
HER2-Positive Solid Tumors
NSCLC (Non-small Cell Lung Cancer)
HER2-positive Bladder Cancer
HER2-positive Colorectal Cancer
HER2 + Gastric Cancer
HER2-positive Gastroesophageal Cancer
53 sites across 27 states
Spain6
Italy4
South Korea4
Michigan3
Texas3
France3
United Kingdom3
California2
  • Iambic Therapeutics, Inc., Senior Medical Director · STUDY_DIRECTOR · Iambic Therapeutics, Inc
Iambic Therapeutics, Inc., Senior Medical Director
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Eligibility criteria

Inclusion

Age ≥ 18 years
Have relapsed/refractory HER2-altered malignancy; for selected cohorts, prospective confirmation of HER2 alteration by central testing is required
Have progression of disease after the last systemic therapy, or be intolerant of last systemic therapy
Have radiographically measurable disease by RECIST v1.1 and/or RANO-BM
Eastern Cooperative Oncology Group (ECOG) performance score 0-1
Have adequate baseline hematologic, liver and renal function
Have left ventricular ejection fraction (LVEF) ≥ 50%
Able to swallow oral medication

Exclusion

Clinically significant cardiac disease
Infection with human immunodeficiency virus (HIV)-1 or HIV-2. Exception: Participants with well-controlled HIV (e.g., CD4 \>350/mm3 and undetectable viral load) are eligible
Current active liver disease including hepatitis A, hepatitis B , or hepatitis C
Refractory nausea and vomiting, malabsorption, external biliary shunt, or significant small bowel resection that would preclude adequate absorption
Uncontrolled diabetes
History of solid organ transplantation
History of Grade ≥2 CNS hemorrhage, or any CNS hemorrhage within 28 days before C1D1
Prior history of non-infectious interstitial lung disease (ILD). (Exceptions: participants with prior grade 1 ILD that has completely resolved are eligible)
Participants requiring immediate local therapy for brain metastases
  • Incidence and severity of dose limiting toxicities (DLTs) (Part 1 only)21 days

    Incidence and severity of DLTs during the first cycle of treatment in participants in Part 1

  • Incidence and severity of adverse events (AEs)Through 30 days after the last dose of study drug

    Incidence of treatment emergent AEs (TEAEs) and serious adverse events (SAEs)

  • Pharmacokinetic (PK) parametersUp to 42 days

    PK parameters. Includes but is not limited to assessment of maximum concentration (Cmax).

  • Confirmed objective response rate (cORR)Through study completion, estimated as 46 months

    Percentage of participants who achieve a confirmed objective response (complete response \[CR\] + partial response \[PR\]) per the Response Evaluation Criteria In Solid Tumors (RECIST) v1.1

  • Confirmed central nervous system ORR (CNS-cORR)Through study completion, estimated as 46 months

    Percentage of participants who achieve a confirmed CNS-cORR (CNS-CR + CNS-PR) per the Response Assessment in Neuro-Oncology Brain Metastases (RANO-BM) Criteria

  • Frequency of IAM1363 dose modifications, including treatment discontinuationsThrough 30 days after the last dose of study drug
  • Incidence and severity of clinical laboratory abnormalitiesThrough 30 days post last dose of study drug
  • Incidence of ECG abnormalitiesThrough 30 days after the last dose of study drug

    As measured using standard ECG parameters, including pulse rate, QT intervals, and QRS duration.