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Alpha Tau Medical Ltd (DRTS)

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Alpha DaRT™ Technology

Alpha particles are known to be very destructive to tumor cells. They cause direct, irreparable damage to the cell DNA and lead to cell death. However, the range in which alpha particles can travel in tissue is very limited. Therefore, until now, it was not possible to use alpha particles as a locally delivered treatment for solid tumors. 

The Alpha DaRT technology relies on the diffusion of atoms that emit alpha particles within the tumor tissue, in order to overcome the short-range limitation of alpha particles. The extended range to which the alpha radiation can reach enables the potential treatment of the entire tumor. 

The Alpha DaRT technology is based on small, extremely precise amounts of radioactive radium-224 affixed to metal sources that are inserted into the tumor itself. When radium-224 decays, it releases radioactive atoms with short lifespans that diffuse inside the tumor. These atoms emit short-range alpha radiation that damages and kills cancer cells within a short period of time.



                                                                                          Alpha DaRT™ Treatment

While local radiation therapy has been a mainstay of cancer therapy for years, it has been mostly limited to modalities utilizing beta or gamma emissions. Alpha DaRT™ is the first localized anticancer therapy to utilize the specific therapeutic properties of alpha particles to treat solid tumors. 
Due to the inherent limited range of the alpha particles, the Alpha DaRT technology, directly inserted into a solid tumor, has the potential to kill cancerous cells with localized precision without damaging surrounding healthy tissues.?This means that treatment with Alpha DaRT may produce fewer harsh side effects than standard cancer therapies such as chemotherapy, conventional radiation therapy, or invasive surgery.
How does the procedure work ?
For superficial tumors, the Alpha DaRT is administered by inserting thin sources emitting alpha radiation directly into the tumor,?through a quick, outpatient procedure, with minimal radioactive exposure and no need for hospitalization. After several days, at which point the dose of radiation has largely been delivered, the sources are removed from the tumor. 
The benefits of the treatment:

Promising efficacy results achieved in preliminary clinical trials. In a first-in-human trial of certain cancers of the skin or head and neck, Alpha DaRT achieved a 100% overall response rate with over 78% complete response rate, where the tumor completely disappeared. Even tumors which had been resistant to prior radiation treatments responded to Alpha DaRT. 

Mild side effect profile. With minimal radioactive exposure, the treatment has the potential to destroy solid tumors irreparably with localized precision, while sparing surrounding healthy tissue. 

Single-session treatment. Alpha DaRT is applied to superficial tumors under local anesthesia in a short, single session. 

Potential stimulatory immune effect.?Previous?studies have demonstrated encouraging anti-tumor immune responses when tested in combination with immunotherapies or other systemic therapies. 

Opportunity to treat patients with limited alternative treatment options. The Alpha DaRT can potentially help patients who have radio-resistant or recurring tumors, who are ineligible for surgery, or for whom surgery would not have a meaningful impact on quality of life, or who otherwise would have limited treatment options. 


Alpha DaRT possesses unique characteristics that may significantly optimize the efficacy, safety, and convenience of cancer treatment: 

           Higher linear energy transfer inherent to alpha radiation, which can produce rapid and improved “kill” rates of cancer cells. 

           Irreversible break of both DNA strands, preventing cancer cell repair. 

           Designed to treat a limited range, sparing surrounding tissues. 

           Potentially stimulating an immune response to the primary tumor, which might also be harnessed in destroying metastases throughout the body. 

           Mechanism is independent of tumor oxygen level – Alpha radiation’s mechanism of cell destruction is independent of cell cycle stage and oxygenation level of the tumor. Hence, the
                  Alpha DaRT treatment may possess an advantage in application to hypoxic tumors which demonstrate resistance to gamma radiation. 

           Lower levels of exposure – reducing the radiation risk or need for radiation safety measures for both the patient and the physicians. 

           Ultra-minimally invasive applicators – The company has developed proprietary ultra-minimally invasive applicators that can be utilized for various types of tumors within different
                   anatomic areas. 

           Minimal capital expenditure - Since Alpha DaRT applicators are disposable and the treatment does not require significant capital equipment or special shielding, Alpha DaRT can be made
                    more broadly available to millions of patients worldwide,  compared to other radiation therapy paradigms. 

           Potential utility in all solid tumor types: in our pre-clinical studies across multiple types of tumor to date, no tumor type has been found to be completely resistant to Alpha DaRT. 

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