Alpha Radiation Emitters Device (DaRT) for the Treatment of Liver Metastases

A Feasibility and Safety Study of Intratumoral Diffusing Alpha Radiation Emitters for the Treatment of Liver Metastases

This is a single center study enrolling up to 10 patients. The primary objective is to Evaluate the feasibility and safety of the DaRT for the treatment of Liver Metastases. The secondary objective is to evaluate the pathological response of liver metastases according to the Modified tumor regression grade[1] and to evaluate the radiological response of liver metastases using the RECIST criteria.

Study Overview

• Status: Recruiting
• Conditions: Liver Metastases
• Intervention / Treatment: Device: Diffusing Alpha Radiation Emitters Therapy (DaRT)

Detailed Description

This study is a Prospective, Open label, one arm, single center study to evaluate the feasibility and safety of Diffusing Alpha Radiation Emitters for the treatment of Liver Metastases .

Alpha Tau Medical proposes a unique treatment methodology for patients with liver metastases - Diffusing Alpha-emitters Radiation Therapy (DaRT) - whereby alpha particles are used to destroy solid tumors. The concept is predicated on the use of DaRT radioactive sources for radiotherapy.

DaRT is based on a nuclear decay chain originating with thorium-228 (1.91 years half-life). Outside of negligible, non-significant trace amounts, the thorium-228 remains confined to the Alpha Tau Medical manufacturing facility, and is used to generate radium-224, which is coated onto 316LVM stainless steel wires (Alpha DaRT Seeds).

The Primary endpoint of the study is : 1) Feasibility assessments of the ability to achieve full volume coverage of liver metastases volume.

2) Safety of the Alpha DaRT Seeds as therapy for liver metastases , Safety will be assessed and recorded according to CTCAE V5.

• Study Type: Interventional
• Enrollment (Estimated): 10
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Liron Dimnik; Phone Number: +972237377000; Email: LironD@alphatau.com

Study Locations

• Canada
  • Quebec
    • Montreal, Quebec, Canada, H4A 3T2
      • Recruiting
      • e McGill University Health Centre (MUHC)
      • Contact: Peter Metrakos, MD
      • Contact: Anthoula Lazaris; Email: anthoula.lazaris@mail.mcgill.ca

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Referred for a two staged hepatectomy following a multidisciplinary team discussion, to resect liver metastases of colorectal cancer
2. Targetable lesion(s) must be technically amenable for complete coverage (including margins) by the Alpha DaRT Seeds / Target(s) must be reachable for implantation
3. Liver lesions are visible and measurable by CT according to RECIST v 1.1
4. Age ≥ 18 years old
5. ECOG Performance Status Scale ≤ 2
6. Subjects' life expectancy is at least 12 weeks

7. The following laboratory parameters

   • WBC ≥ 3500/µl, granulocyte ≥ 1500/µl
   • Hemoglobin > 85 g/L
   • Total bilirubin < 51.3 umol/L
   • Platelet count >75 X 109 /L or > 50% Prothrombin activity
   • Amylase and lipase < 1.5 X the upper limit of normal
   • AST and ALT ≤ 5 X ULN
   • Prothrombin time (PT) international normalized ratio (INR) < 2.3 or PT < 6 seconds above control. Patients who are being therapeutically anticoagulated with an agent such as Coumadin or heparin will be allowed to participate provided that no prior evidence of underlying abnormality in these parameters exists
8. Subjects are willing and able to sign an informed consent form
9. Women of childbearing potential (WOCBP) will have evidence of negative pregnancy test within seven days before the Ra-224 implantation
10. Subjects must agree to use adequate contraception (vasectomy or barrier method of birth control) prior to study entry, for the duration of study participation and for 3 months after discontinuing therapy

Exclusion Criteria:

1. Concurrent cancer that is distinct in primary site or histology from colorectal cancer. Except cervical carcinoma in situ, prostate cancer with good prognosis, treated basal cell carcinoma, superficial bladder tumors (Ta, Tis & T1). Any cancer curatively treated 3 years prior to entry is permitted.
2. Patients undergoing systemic immunosuppressive therapy excepting intermittent, brief use of systemic corticosteroids

3. Contraindication to angiography:

   • Any bleeding diathesis or coagulopathy that is not correctable by usual therapy or hemostatic agent
   • Severe peripheral vascular disease precluding catheterization
   • History of severe allergy or intolerance to contrast agents, narcotics, sedatives or atropine that cannot be managed medically
4. Known hypersensitivity to any of the components of the treatment.
5. Clinically significant cardiovascular disease, e.g. cardiac failure of New York Heart Association classes III-IV, uncontrolled coronary artery disease, cardiomyopathy, uncontrolled arrhythmia, uncontrolled hypertension, or history of myocardial infarction in the last 12 months.
6. Patients with clinically significant gastrointestinal bleeding within 30 days prior to study entry.
7. Brain metastases
8. Active clinically serious infections
9. Major surgery within 4 weeks of start of the study therapy
10. Patients with uncontrolled intercurrent illnesses including, but not limited to an active infection requiring systemic therapy or a known psychiatric or substance abuse disorder(s) that would interfere with cooperation with the requirements of the trial or interfere with the study endpoints.
11. Any condition that is unstable or which could jeopardize the safety of the patient and his/her compliance in the study
12. High probability of protocol non-compliance (in opinion of investigator)
13. Pregnant or breastfeeding women

14. Volunteers participating in another interventional study in the past 30 days which might conflict with the endpoints of this study or the evaluation of response or toxicity of DaRT

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Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: DaRT Seeds; Intratumoral Diffusing alpha-emitters Radiation Therapy (DaRT) Seeds	Device: Diffusing Alpha Radiation Emitters Therapy (DaRT); Alpha DaRT Applicators (the Alpha Needle Applicator, the Alpha Flex Applicator, and the Alpha Plant Applicator) and radioactive sources named Alpha DaRT Seeds - Ra-224 coated onto stainless steel tubes inserted into the tumor. Collectively, the Alpha DaRT Applicators and Seeds are referred to as the "Alpha DaRT Device".

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Feasibility - DaRT seed placement	Assessment of successful placement of the Alpha DaRT Seeds into liver metastases during a 2-stage hepatectomy via imaging	From first operation - DaRT insertion up to 24 months
Safety - Adverse events	Assess the frequency and severity of acute adverse events related to DaRT. Adverse events will be assessed and graded according to Common Terminology and Criteria for Adverse Events (CTCAE) version 5.0.	Up to 24 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
To evaluate the pathological response of liver metastases according to the Modified tumor regression grade 1	Pathological response to Alpha DaRT Seeds in covered areas after surgery	7-9 Weeks post DaRT insertion
To evaluate the radiological response of liver metastases using the RECIST criteria .	Radiological response to Alpha DaRT seeds implantation after the Alpha DaRT Seeds insertion procedure and prior to the second stage	6-8 weeks post DaRT insertion

Collaborators and Investigators

• Sponsor: Alpha Tau Medical LTD.
• Investigators: Principal Investigator: Peter Metrakos, MD, McGill University Health Centre/Research Institute of the McGill University Health Centre

Study record dates

Study Major Dates

• Study Start (Actual): October 1, 2023
• Primary Completion (Estimated): February 1, 2027
• Study Completion (Estimated): July 1, 2027

Study Registration Dates

• First Submitted: February 27, 2023
• First Submitted That Met QC Criteria: April 23, 2023
• First Posted (Actual): April 25, 2023

Study Record Updates

• Last Update Posted (Actual): June 16, 2026
• Last Update Submitted That Met QC Criteria: June 15, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• Keywords: Brachytherapy; Alpha radiation; Liver Metastases; Alpha emitting radiation
• Additional Relevant MeSH Terms: Digestive System Diseases; Pathologic Processes; Neoplasms; Neoplasms by Site; Digestive System Neoplasms; Liver Diseases; Neoplastic Processes; Neoplasm Metastasis; Liver Neoplasms
• Other Study ID Numbers: CTP-LIV-00

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No