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Ac-AKY-2519

Phase 1

Castration Resistant Metastatic Prostate Cancer | Small molecule | Oncology |Aktis Oncology, Inc.|Last Updated: Jul 14, 2026

Target and mechanism

ModalitySmall molecule

Also known as [225Ac]Ac-AKY-2519 (therapeutic)

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment138

FDA Designations

No designations recorded

Clinical trial landscape

Ac-AKY-2519 · 1 trial · 5 indications

Phase 1 1
NCT07581184A Study of [225Ac]Ac-AKY-2519 in Patients With Metastatic Castration-Resistant Prostate CancerCastration Resistant Metastatic Prostate Cancer
RECRUITING138 Analytics
PHASE1RECRUITING
A Study of [225Ac]Ac-AKY-2519 in Patients With Metastatic Castration-Resistant Prostate Cancer
Castration Resistant Metastatic Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Occurrence of adverse events by severity and occurrence of serious adverse events (SAEs) in participants who received [225Ac]Ac-AKY-2519
Up to 30 days following last administration of [225Ac]Ac-AKY-2519

An AE is defined as any untoward medical occurrence in a participant administered study drug, which does not necessarily have to have a causal relationship with the study drug. The number of patients experiencing an AE and the number of patients experiencing an SAE will be reported. Up to 30 days following last administration of \[225Ac\]Ac-AKY-2519

Occurrence of dose-limiting toxicity (DLT) in mCRPC participants with and without prior 177Lu-PSMA-617 exposure
From first administration of [225Ac]Ac-AKY-2519 to the end of Cycle 1 (each cycle is 28 days)

Dose-limiting toxicities (DLTs) is defined as any predefined AE occurring during the DLT observation period, except those that are clearly and incontrovertibly due to extraneous circumstances. The number of patients who experience a DLT will be reported separately for each cohort and by dose level within each cohort.

Secondary Endpoints

Occurrence of adverse events by severity and occurrence of serious adverse events (SAEs) in participants who received [64Cu]Cu-AKY-2519
Up to 30 days following last administration of [64Cu]Cu-AKY-2519
Objective Response Rate (ORR)
Up to 30 days following last administration of [225Ac]Ac-AKY-2519
Duration of Response (DoR)
Up to 5 years after first administration
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
[225Ac]Ac-AKY-2519EXPERIMENTAL -

Interventions

NameTypeDescription
[225Ac]Ac-AKY-2519 (therapeutic)DRUG\[225Ac\]Ac-AKY-2519 Injection
[64Cu]Cu-AKY-2519 (imaging)DRUG\[64Cu\]Cu-AKY-2519 Injection
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: * Age ≥ 18 years * Histologic or cytologic confirmation of prostatic adenocarcinoma * ECOG Performance Status of 0 or 1 * Adequate end-organ function * Ability to give informed consent and comply with study requirements * Patients with CNS metastases are eligible if they have re...

Countries:United States
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Recent Changes (Last 90 Days)

LOWJul 14, 2026NCT07581184lastUpdatePostDate: changed
LOWJul 14, 2026NCT07581184lastUpdatePostDate: changed
LOWJul 9, 2026NCT07581184lastUpdatePostDate: changed
LOWJul 9, 2026NCT07581184lastUpdatePostDate: changed
LOWMay 26, 2026NCT07581184primaryCompletionDate: changed
LOWMay 24, 2026NCT07581184studyFirstPostDate: changed
LOWMay 21, 2026NCT07581184NEW_TRIAL: changed
LOWMay 21, 2026NCT07581184NEW_TRIAL: changed

Frequently asked questions about Ac-AKY-2519

What is Ac-AKY-2519 used for?

Ac-AKY-2519 is an investigational small molecule being developed for the treatment of castration resistant metastatic prostate cancer (mCRPC). It is currently in Phase 1 clinical development and has not been approved by the FDA. The drug is being studied in patients with metastatic castration-resistant prostate cancer.

What does Ac-AKY-2519 target?

Ac-AKY-2519 targets B7H3, a protein that is expressed in certain cancers. The drug is designed to deliver a radioactive payload, actinium-225, to B7H3-expressing tumor cells. This targeted approach is being evaluated in a Phase 1 clinical trial for metastatic castration-resistant prostate cancer.

Who makes Ac-AKY-2519?

Ac-AKY-2519 is being developed by Aktis Oncology, Inc., a biopharmaceutical company. The company is publicly traded under the ticker symbol AKTS. Aktis Oncology is conducting a Phase 1 clinical trial to evaluate the safety and efficacy of Ac-AKY-2519 in patients with metastatic castration-resistant prostate cancer.

What phase is Ac-AKY-2519 in?

Ac-AKY-2519 is in Phase 1 clinical development. It is an investigational drug that has not yet been approved by regulatory authorities. The ongoing Phase 1 trial is recruiting patients with metastatic castration-resistant prostate cancer to assess the drug's safety, tolerability, and preliminary efficacy.

What clinical trials is Ac-AKY-2519 in?

Ac-AKY-2519 is being studied in a Phase 1 clinical trial with the identifier NCT07581184. The trial, titled 'A Study of [225Ac]Ac-AKY-2519 in Patients With Metastatic Castration-Resistant Prostate Cancer,' is currently recruiting participants in the United States. The study aims to enroll 138 male patients aged 18 years and older.

Is Ac-AKY-2519 the same as [225Ac]Ac-AKY-2519?

Yes, Ac-AKY-2519 is the same as [225Ac]Ac-AKY-2519. The latter name specifies the therapeutic form of the drug, which includes the radioactive isotope actinium-225. This radiolabeled version is the active therapeutic agent being evaluated in clinical trials for metastatic castration-resistant prostate cancer.