SIGA Announces Oncology Collaboration with KaliVir Immunotherapeutics

SIGA to Supply TPOXX to Support KaliVir’s Oncolytic Vaccinia Clinical Immunotherapy Program

NEW YORK, July 15, 2022 (GLOBE NEWSWIRE) -- SIGA Technologies, Inc. (SIGA) (NASDAQ: SIGA), a commercial-stage pharmaceutical company focused on the health security market, today announced a collaboration with KaliVir Immunotherapeutics to make TPOXX (tecovirimat) available for use with KaliVir’s proprietary oncolytic vaccinia immunotherapy platform. This novel oncolytic platform includes multiple proprietary genetic modifications that can be combined to generate a unique oncolytic virus that has been optimized for systemic delivery and anti-tumor immune stimulation. Under this partnership, SIGA is providing its TPOXX oral capsules to support future clinical programs.

“KaliVir is an innovator in the creation of oncolytic viral immunotherapies, and we are excited to enter into this collaboration with them,” said Dr. Phil Gomez, CEO of SIGA. “TPOXX is a powerful antiviral drug to vaccinia and allows the safe use of higher doses of vaccinia vectors; there is also the potential it could increase immunotherapeutic outcomes. This collaboration helps bring new levels of assurance to physicians, regulators, and especially patients receiving these promising investigational therapies.”

“We are pleased to announce this collaboration with SIGA Technologies,” said Helena Chaye, Ph.D., J.D., CEO of KaliVir. “Pairing oncolytic immunotherapies with an effective antiviral agent is a critical part of the development of new treatments, and we look forward to enhancing our groundbreaking oncolytic immunotherapy programs with the support of SIGA’s TPOXX.”

On July 13, 2018, the U.S. Food and Drug Administration (FDA) approved oral TPOXX for the treatment of smallpox to mitigate the impact of a potential outbreak or bioterror attack. In preclinical studies, TPOXX has been shown to be active against most orthopoxviruses, including vaccinia (published in NEJM, 2018). The unique mechanism of action of TPOXX coupled with published efficacy in animal studies, make it an important addition to development programs focused on vaccinia-based cancer therapies. In 2020, SIGA entered into numerous collaborations, including a partnership with Turnstone Biologics to supply TPOXX to support Turnstone’s clinical oncolytic vaccinia immunotherapy programs. In 2021, SIGA entered into a preclinical research collaboration with Bioarchitech to investigate TPOXX enabling higher doses of vaccinia vectors when used in combination with Bioarchitech’s oncolytic vaccinia-based immunotherapy platform.