A Study of Diffusing Alpha Radiation Therapy for Patients With Breast Carcinoma in Frail or Elderly Patients.


Alpha Tau Medical




Breast Cancer
Breast Carcinoma
Recurrent Breast Cancer


Device: Diffusing Alpha Radiation Emitters Therapy (DaRT)

Study type


Funder types




Details and patient eligibility


A unique approach for cancer treatment employing intratumoral diffusing alpha radiation emitter device for the treatment of newly diagnosed or Recurrent Breast Carcinoma in frail or elderly patients.

Full description

This is a Prospective Open label Single arm multi-center interventional study. The study is designed to evaluate the Feasibility and Safety of DaRT seeds for the treatment of newly diagnosed or Recurrent Breast Carcinoma in frail or elderly patients. The study will be comprised of a screening period, DaRT insertion visit, acute follow-up phase of 4- 8 weeks and a long-term follow up phase of 24 months. The total duration of the study will be 24 months from the DaRT insertion procedure. A total of 10 subjects will be enrolled from all breast cancer subtypes (HR+/HER-2-, HR+/HER-2+, HR-/HER-2-, and HR-/HER-2-.). No formal interim analysis is planned for this study. Eligible patients who meet inclusion/exclusion criteria (as assessed during the screening period) will be invited to the site for the procedure of DaRT seeds insertion. The patients will be monitored for a period of 24 months post insertion


10 estimated patients




65 to 120 years old


No Healthy Volunteers

Inclusion criteria

  • Histologically confirmed invasive breast tumor with no involvement of skin within 12 months.

  • Tumor size ≤ 4 centimeters in the longest diameter.

  • Tumor is not deemed as resectable with radical surgery or the patient does not wish to go through surgery

  • De-novo or recurrent lesions.

  • Single lesion per quadrant per subject.

  • Targeted lesion must be technically amenable for complete coverage (including margins) by the DaRT seeds.

  • Interstitial implant indication validated by multidisciplinary team.

  • ECOG Performance Status ≤3.

  • Life expectancy ≥12 months.

  • Women Age ≥65 or younger if unfit for standard of care.

  • Willing and have the ability to provide signed Informed Consent.

  • Blood tests values:

    • Leucocytes ≥3000mm3,
    • Absolute neutrophil count ≥1500mm3,
    • Platelets ≥100,000 mm3,
    • Total bilirubin ≤ 1.5xULN,
    • AST, SGOT, SGPT ≤2.5xULN, If Alkaline Phosphatase ≤ 4xULN, then transaminases are normal.
    • Creatinine ≤ 2.0xULN.
    • INR or Prothrombin time ≤1.5xULN

Exclusion criteria

  • T4 category with skin involvement.
  • Ductal carcinoma in situ.
  • Inflammatory breast carcinoma.
  • Longest tumor diameter >4 cm.
  • Patients with prior radiation to the same area within the past 6 months.
  • Has a known additional malignancy that is progressing or requires active treatment.
  • Patients undergoing immunosuppressive and/or systemic corticosteroid treatment except for steroid inhalations for treatment of asthma or lung disease
  • Subjects not willing to sign an informed consent.

Trial design

Primary purpose




Interventional model

Single Group Assignment


None (Open label)

10 participants in 1 patient group

DaRT Seeds
Experimental group
Intratumoral Diffusing alpha-emitters Radiation Therapy (DaRT) Seeds
Device: Diffusing Alpha Radiation Emitters Therapy (DaRT)

Trial contacts and locations



Central trial contact

Liron Dimnik; Aviya Hoida

Data sourced from clinicaltrials.gov

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