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131I-IPA

Phase 1

Neoplastic Disease | Small molecule | Oncology |Telix Pharmaceuticals Limited|Last Updated: Aug 13, 2026

Target and mechanism

Molecular targetLAT1
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMC
Total Trials1
Total Enrollment12

FDA Designations

No designations recorded

Clinical trial landscape

131I-IPA · 1 trial · 3 indications

Phase 1 1
NCT05450744131I-TLX-101 for Treatment of Newly Diagnosed Glioblastoma (IPAX-2)Neoplastic Disease
ACTIVE NOT_RECRUITING12 Analytics
PHASE1ACTIVE NOT_RECRUITING
131I-TLX-101 for Treatment of Newly Diagnosed Glioblastoma (IPAX-2)
Neoplastic DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence rate and the grade (severity) of DLTs
8 weeks from the first dose of IMP until discharge from the second dosem, up to 62 weeks.

Incidence rate and the grade (severity) of DLTs based on the occurrence of Adverse Events (AEs) reported according to the NCI CTCAE v6.0. DLTs include any grade ≥ 3 events considered possibly related to the study drug, but excludes cerebral oedema, and haematological toxicity.

Safety, tolerability and RP2D
From screening until end of study, assessed over 62 weeks. TEAEs - units are frequency (percentage) and severity. Laboratory - safety laboratory including liver functions test, report mean and out of range.

Assessing TEAEs type according to MedDRA (Medical Dictionary for Regulatory Activities), frequency, severity according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) V5.0, seriousness, and relationship of study treatment will be assessed. Laboratory abnormalities will be assessed according to the NCI CTCAE V5.0.

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Study Design & Arms

AllocationNA
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
131I-TLX101 + standard of careEXPERIMENTAL -

Interventions

NameTypeDescription
131I-IPADRUG131I-IPA: injection/solution administrated intravenously via infusion in ascending doses 18F-FET: injection/solution administrated intravenously
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites5

Inclusion Criteria: 1. Understand and voluntarily sign the informed consent form prior to any study related procedure and/or assessments being conducted. 2. Are Male or Female, and aged 18 years or older, at the time of signing the informed consent. 3. Have histologically confirmed intracranial gli...

Countries:AustraliaAustriaNetherlands
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Recent Changes (Last 90 Days)

MEDIUMAug 14, 2026NCT05450744Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMAug 14, 2026NCT05450744Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMAug 14, 2026NCT05450744Status: RECRUITING → ACTIVE_NOT_RECRUITING

Frequently asked questions about 131I-IPA

What is 131I-IPA used for?

131I-IPA is an investigational small molecule being developed for the treatment of neoplastic disease, specifically glioblastoma, including glioblastoma multiforme. It is currently in Phase 1 clinical development and is not yet approved by regulatory authorities.

What does 131I-IPA target?

131I-IPA targets the LAT1 transporter, which is a molecular target involved in amino acid transport. By targeting LAT1, the drug is designed to deliver a radioactive iodine isotope (131I) to cancer cells, potentially enabling targeted radiation therapy for tumors.

Who is developing 131I-IPA?

131I-IPA is being developed by Telix Pharmaceuticals Limited, a biopharmaceutical company listed on the Australian Securities Exchange under the ticker TLX. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with glioblastoma.

What phase is 131I-IPA in?

131I-IPA is currently in Phase 1 clinical development. It is an investigational drug, meaning it has not yet received regulatory approval and is still being studied in clinical trials to assess its safety, tolerability, and potential efficacy in treating neoplastic diseases such as glioblastoma.

What clinical trials is 131I-IPA in?

131I-IPA is being evaluated in a Phase 1 clinical trial with the identifier NCT05450744, titled '131I-TLX-101 for Treatment of Newly Diagnosed Glioblastoma (IPAX-2)'. This trial is active but not recruiting, with an enrollment of 12 participants across Australia, Austria, and the Netherlands.

Is 131I-IPA the same as 131I-TLX-101?

Yes, 131I-IPA is also known as 131I-TLX-101. The clinical trial NCT05450744 uses the name 131I-TLX-101 to refer to the same investigational drug, which is being studied for the treatment of newly diagnosed glioblastoma.