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

Study Overview
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Brief Summary
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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.

Detailed Description
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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 . The Diffusing Alpha-emitter Radiation Therapy (DaRT), based on the interstitial intratumoral placement of an encapsulated Radium-224 source (3.7 days half-life), is described in this study. These sources release short-lived alpha-emitting atoms into the tumor microenvironment by recoil. DaRT seeds will be inserted into recurrent Squamous Cell Carcinoma (SCC) tumors and will be removed following 14-21 days. 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.

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

Conditions
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Liver Metastases

Intervention / Treatment
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* Device: Diffusing Alpha Radiation Emitters Therapy (DaRT)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Referred for a two staged hepatectomy following a multidisciplinary team discussion, to resect liver metastases of colorectal cancer Targetable lesion(s) must be technically amenable for complete coverage (including margins) by the Alpha DaRT Seeds / Target(s) must be reachable for implantation Liver lesions are visible and measurable by CT according to RECIST v 1.1 Age ≥ 18 years old ECOG Performance Status Scale ≤ 2 Subjects' life expectancy is at least 12 weeks 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 Subjects are willing and able to sign an informed consent form Women of childbearing potential (WOCBP) will have evidence of negative pregnancy test within seven days before the Ra-224 implantation 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: 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. Patients undergoing systemic immunosuppressive therapy excepting intermittent, brief use of systemic corticosteroids 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 Known hypersensitivity to any of the components of the treatment. 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. Patients with clinically significant gastrointestinal bleeding within 30 days prior to study entry. Brain metastases Active clinically serious infections Major surgery within 4 weeks of start of the study therapy 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. Any condition that is unstable or which could jeopardize the safety of the patient and his/her compliance in the study High probability of protocol non-compliance (in opinion of investigator) Pregnant or breastfeeding women 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 -

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: DaRT Seeds<br>Intratumoral Diffusing alpha-emitters Radiation Therapy (DaRT) Seeds | Device: Diffusing Alpha Radiation Emitters Therapy (DaRT)<br>* An intratumoral insertion of radioactive sources [Ra-224 containing stainless-steel 316LVM tubes- (Alpha DaRT seeds)]. The seeds release by recoil into the tumor short-lived alpha-emitting atoms<br>|

What is the study measuring?
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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 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Alpha radiation, Alpha emitting radiation, Liver Metastases, Brachytherapy