GSK announced that it has entered a definitive agreement to acquire RAPT Therapeutics, a California-based, clinical-stage biopharmaceutical company developing novel therapies for patients living with inflammatory and immunologic diseases. The acquisition includes ozureprubart, a long-acting anti-immunoglobulin E (IgE) monoclonal antibody, currently in phase IIb clinical development for prophylactic protection against food allergens.
IgE is a clinically validated target and is the only approved systemic therapy shown to protect patients from a harmful allergic and inflammatory immune response. Around 94% of severe food allergies are caused by IgE-mediated reactions.1
Current anti-IgE treatment for food allergy involves injections every 2 to 4 weeks, which can be a significant burden, particularly since most patients are children. Ozureprubart’s clinical profile offers the potential for less frequent dosing of every 12 weeks, supporting improved compliance and patient outcomes; as well as providing a new option to approximately 25% of patients currently ineligible for existing therapy. Ozureprubart complements GSK’s extensive commercial footprint and prescriber base in allergy.
Data from the phase IIb trial (prestIgE) assessing use of ozureprubart as monotherapy is expected in 2027, with phase III trials to be focused on both at-risk adult and pediatric populations. In the US, over 17 million people are diagnosed with food allergies, with more than 1.3 million people suffering severe reactions.2,3,4 This results in more than 3 million patient visits each year to hospital and emergency care.5
Tony Wood, Chief Scientific Officer, GSK said: “The addition of ozureprubart brings another promising new, potential best-in-class treatment to GSK’s pipeline. Food allergies cause severe health impacts to patients with existing treatment requiring injections as frequently as every 2 weeks. Ozureprubart offers the opportunity to bring sustained protection to patients with dosing every 12 weeks, and is consistent with our approach to acquire assets that address validated targets and where there is clear unmet medical need.”
Brian Wong, President & Chief Executive Officer, RAPT Therapeutics, said: “We are excited to enter into this agreement with GSK, which offers an attractive path forward for our programs, particularly the opportunity we envision for ozureprubart in food allergy. This transaction has the potential to provide access to the global development and commercialization capabilities, resources and infrastructure that GSK has to offer and ultimately bring added value to our pipeline, patients and stockholders.”
Financial considerations
Under the terms of the agreement, GSK will pay RAPT Therapeutics shareholders $58.00 per share at closing for an estimated aggregate equity value of $2.2 billion. Net of cash acquired, GSK’s estimated upfront investment is $1.9 billion.
The transaction gives GSK the global rights to the ozureprubart program, excluding mainland China, Macau, Taiwan and Hong Kong. GSK will also be responsible for success-based milestone and royalty payments for ozureprubart owed to RAPT’s partner, Shanghai Jeyou Pharmaceutical Co., Ltd.
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