06.JUNE 2019 AT 07:30:00 CET

Amsterdam, The Netherlands, June 6, 2019 – Kiadis Pharma N.V. (“Kiadis” or the “Company”) (Euronext Amsterdam and Brussels: KDS), a clinical stage biopharmaceutical company, today announces that it has closed the previously announced acquisition of CytoSen Therapeutics, Inc. (“CytoSen”). 

The transaction creates a leader in cell-based cancer immunotherapy with proprietary and synergistic NK-cell and T-cell therapy platforms that have the potential to revolutionize HSCT and create a pipeline with novel cancer treatments. Kiadis now has a complementary development pipeline focused on improving outcomes for patients undergoing hematopoietic stem cell transplants (HSCT) with a T-cell therapy (ATIR101; in EU registration and a global Phase 3 clinical trial) and a NK-cell therapy (CSTD002; expected to enter the clinic in the US in 2020).

Arthur Lahr, CEO of Kiadis commented: “Our vision is to leverage the strengths of the human immune system to help patients with life-threatening diseases and through this acquisition we can now create novel cell therapies that combine the innate and adaptive arms of the immune system. This transaction is transformative for Kiadis as we now have two synergistic proprietary cell-based immunotherapy platforms and the ability to create a pipeline of innovative treatments for cancer patients.”

Total upfront consideration paid to the holders of CytoSen shares and options on closing consists of 1,513,052 newly issued Kiadis shares and 159,778 options to acquire Kiadis shares. Upon acceptance by aforementioned parties of the shares issued to them, the newly issued Kiadis shares shall be admitted to trading on Euronext Amsterdam and Euronext Brussels on the basis of the listing prospectus within the meaning of Directive 2003/71/EC, as amended and Directive 2010/73/EU consisting of the registration document approved by the Netherlands Authority for the Financial Markets (Autoriteit Financiële Markten, “AFM”) dated May 31, 2019 and the summary and securities note approved by the AFM dated May 31, 2019 that have been made generally available. Of the 1,513,052 newly issued Kiadis shares, 874,129 shares (57.8%) are subject to lock-up restrictions during a two-year period, and the other 638,923 shares (42.2%) are subject to lock-up restrictions during a 180-day period. 

Further to the abovementioned 1,513,052 newly issued Kiadis shares, the holders of CytoSen shares have a conditional entitlement to receive 267,012 newly issued Kiadis shares – the Holdback Shares as defined in the listing prospectus. The Holdback Shares serve as a source for the satisfaction of indemnification and other claims that Kiadis may have on the CytoSen shareholders pursuant to the acquisition agreement. Subject to reduction in respect of these indemnification and other claims, the Holdback Shares will be issued 18 months from the completion date. Also, as per the acquisition agreement, the holders of CytoSen shares and options are eligible to potential future consideration of up to 5,819,460 additional Shares upon the achievement of six clinical development and regulatory milestones.

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