Alpha Tau Announces Enrollment of First Patient in Combination Trial of Alpha DaRT™ and Pembrolizumab (Keytruda®)

JERUSALEM, Israel I November 3, 2021 I Alpha Tau Medical Ltd. ("Alpha Tau"), the developer of the innovative alpha-radiation cancer therapy Alpha DaRT, announced today that it has enrolled its first patient in the combination study of Alpha DaRT and pembrolizumab (Keytruda®) at Hadassah Medical Center in Jerusalem, Israel.

The clinical trial is designed to test the benefit of the Alpha DaRT in combination with pembrolizumab, an immunotherapy drug, for the treatment of recurrent unresectable or metastatic squamous cell carcinoma of the head and neck. The primary objective of the study is to evaluate efficacy of the combination, as measured by the confirmed Best Overall Response rate determined by using the RECIST criteria. Patients enrolled in the trial will receive pembrolizumab cycles every three weeks both before and after receiving Alpha DaRT treatment. The study uses a two-stage adaptive design and can recruit up to 48 patients, with a planned interim analysis after the first 18 patients have been treated.

"We are excited to begin our much-anticipated first human clinical trial combining the Alpha DaRT with a checkpoint inhibitor," said Alpha Tau CEO Uzi Sofer. "This initiative is a major component of the vision and future direction of Alpha Tau, as we look to evaluate our locally administered Alpha DaRT therapy for its potential to provide local treatment of tumors and also contribute to a systemic response in untreated tumors throughout the body."

Alpha Tau CMO Dr. Robert Den remarked, "The novel adaptive two-stage trial design will allow us to determine very quickly whether we have observed an improved systemic response from the combination of Alpha DaRT with pembrolizumab, and at the same time allow for a meaningful enough patient population to support decision-making with respect to our clinical pathway. We are looking forward to seeing the data from this trial, particularly in light of our pre-clinical data showing that the combined use of Alpha DaRT with immunomodulators resulted in decreased metastatic burden and improved survival in treated animals, and that this activity was modulated by activation of the immune system."

Prof. Aron Popovtzer, Head of the Sharett Institute of Oncology at Hadassah Medical Center in Jerusalem, and principal investigator of the study, commented, "We are excited to be leading this trial, the first one to combine Alpha DaRT with an immunotherapy in humans. We believe this patient population presents a serious unmet need, and we are looking forward to seeing whether this combination can provide a new source of relief for these patients."

About Alpha DaRT   

Alpha DaRT (Diffusing Alpha-emitters Radiation Therapy) is designed to enable highly potent and conformal alpha-irradiation of solid tumors by intratumoral delivery of radium-224 impregnated sources. When the radium decays, its short-lived daughters are released from the source and disperse while emitting high-energy alpha particles with the goal of destroying the tumor. Since the alpha-emitting atoms diffuse only a short distance, Alpha DaRT aims to mainly affect the tumor, and to spare the healthy tissue around it. 

About Alpha Tau Medical Ltd.

Founded in 2016, Alpha Tau is an Israeli medical device company that focuses on research, development, and potential commercialization of the Alpha DaRT for the treatment of solid tumors. The technology was initially developed by Prof. Itzhak Kelson and Prof. Yona Keisari from Tel Aviv University.

On July 8, 2021, Alpha Tau announced that it had entered into a definitive merger agreement (the "Merger Agreement") with Healthcare Capital Corp. (Nasdaq: HCCC) ("HCCC"), a special purpose acquisition company, pursuant to which Alpha Tau would consummate a business combination transaction (the "Business Combination") with HCCC and become a Nasdaq-listed public company.

Media Package: https://www.alphatau.com/media-package

Additional Information and Where to Find It

For additional information on the Business Combination, see HCCC's Current Report on Form 8-K, which was filed with the Securities and Exchange Commission ("SEC") on July 8, 2021.

In connection with the proposed transaction with HCCC, Alpha Tau has filed a Registration Statement on Form F-4, which includes a preliminary proxy statement/prospectus of HCCC.

Investors and security holders of HCCC are advised to read, when available, the preliminary proxy statement, and amendments thereto, and the definitive proxy statement in connection with HCCC's solicitation of proxies for its special meeting of stockholders to be held to approve the proposed Business Combination because the proxy statement/prospectus will contain important information about the proposed transaction and the parties to the proposed transaction. The definitive proxy statement/prospectus will be mailed to stockholders of HCCC as of a record date to be established for voting on the proposed Business Combination.

Stockholders will also be able to obtain copies of the Registration Statement, proxy statement/prospectus, and Form 8-K, without charge at the SEC's website at www.sec.gov.

No Offer or Solicitation

This announcement is for informational purposes only and is neither an offer to purchase, nor a solicitation of an offer to sell, subscribe for or buy any securities or the solicitation of any vote in any jurisdiction pursuant to the proposed Business Combination or otherwise, nor shall there be any sale, issuance or transfer or securities in any jurisdiction in contravention of applicable law. No offer of securities shall be made except by means of a prospectus meeting the requirements of Section 10 of the Securities Act of 1933, as amended.

Participants in the Solicitation

HCCC and Alpha Tau and their respective directors, executive officers, other members of management, and employees, under SEC rules, may be deemed to be participants in the solicitation of proxies of HCCC's stockholders in connection with the proposed Business Combination between HCCC and Alpha Tau. Investors and security holders may obtain more detailed information regarding the names and interests in the proposed transaction of HCCC's directors and officers HCCC's and Alpha Tau's filings with the SEC, including the Registration Statement.

SOURCE: Alpha Tau Medical

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