New hope for Hard-to-Treat cancers: experimental drug E303 enters human trials
NCT ID NCT07524348
First seen Jun 27, 2026 · Last updated Aug 28, 2026 · Updated 6 times
Summary
This early-stage trial tests an experimental drug called E303 in people with advanced solid tumors that have not responded to standard treatments. The drug is designed to target and attack cancer cells while sparing healthy ones. The main goals are to check safety and see if the drug can shrink tumors.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 1
The first testing in people. Mainly checks safety and dose, usually in a small group.
- Participants
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About 149 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Mar 2026
- Expected to finish
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Jul 2030
An estimate. End dates often move.
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Histologically-confirmed, locally advanced (unresectable) or metastatic solid tumors with recurrence or progression during or after standard therapy, intolerance to standard therapy, refused to receive standard therapy, or for whom no standard therapy is available. Exclusion Criteria: * Have spinal cord compression or clinically active central nervous system metastases * Have leptomeningeal disease * Have thromboembolic or clinically significant bleeding events * Have significant cardiovascular disease * Have an active autoimmune disease
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
7 sites in 4 countries. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Research Site
RECRUITINGScottsdale, Arizona, 85258, United States
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Research Site
RECRUITINGFairfax, Virginia, 22031, United States
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Research Site
RECRUITINGAdelaide, Australia
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Research Site
RECRUITINGMelbourne, Australia
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Research Site
NOT_YET_RECRUITINGSeoul, South Korea
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Research Site
RECRUITINGBarcelona, Spain
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Research Site
RECRUITINGMadrid, Spain
More trials for these conditions
Other studies related to the condition(s) this trial covers.
- Oral drug that targets two cancer drivers tested in first human study
- Mitochondria-Targeting drug gamitrinib tested for first time in humans
- Can a Two-Drug combo outsmart advanced cancer?
- Can an experimental pill boost cancer immunotherapy? early trial puts HG146 to the test
- New injectable drug tested for safety in Hard-to-Treat solid tumors
- New antibody drug conjugate tested against advanced cancers