Creating clinical value through meaningful innovation

Our company

At Quirem Medical we believe treatment outcome of unresectable liver cancer with SIRT can be improved by using microspheres that can be visualized and quantified to improve patient selection, planning and treatment verification. Will you join us in developing and commercializing the next-generation SIRT microspheres?

Management Team

Jan Sigger

Chief Executive Officer

Jan Sigger held senior management positions at Royal Dutch Shell and Akzo Nobel before joining Nucletron, the global market leader in brachytherapy as CFO in 2008. Between 2008 – 2012 he was instrumental in transforming Nucletron into the fastest growing radiotherapy company and managed the sale from private equity ownership to Elekta AB in 2011. Jan Sigger is a Master in Business Economics and holds a post-graduate degree as Chartered Accountant.

Frank Nijsen

Chief Scientific Officer

Frank Nijsen has performed research into Holmium microspheres for more than 20 years. He has led the successful valorisation of the Holmium technology and was instrumental in the creation of the spin-off company Quirem Medical. He holds as inventor many patents in the field. Frank Nijsen holds a doctorate in Medical Biology and is currently Associate Professor at the Radboud University Medical Center.

Supervisory Board


Peter Coenen

Member of the Board

Peter Coenen has more than 25 years of experience in the medical device area leading and adapting organizations to new market situations to deliver value to customers and the companies he worked for. Peter started his career in the medical device division of Ely Lilly which then became Guidant. After the acquisition of Guidant by Boston Scientific Peter was responsible for the legal merger of Guidant and BSX in Japan. He today is a Director and Board member in Terumo Europe responsible for the EMEA region as President of the Interventional business unit. 


Tim Irish


Tim Irish has worked in the life sciences industry for thirty years. His career has spanned global health technology companies across Europe and North America, including GSK, GE and Philips. Tim’s current governance portfolio covers Life Sciences, Healthcare and Education, both public and private, including Board roles as Senior Independent Director and NED at National Institute for Health and Care Excellence (NICE), various European MedTech Supervisory Board roles, and Professor of Practice at King’s College London’s School of Management and Business.


Paul Roos

Member of the Board

Paul Roos is a seasoned executive with extensive experience and a proven track record in the international life sciences industry, having spent over 10 years working in investment banking and over five years as a CFO. He currently serves as CFO of Polyganics. Previously Mr. Roos served as CFO of IRX Innovations and as CFO of Synthon. He began his career at the Corporate Finance Division of Kempen & Co, where he his final position was Executive Director in the Life Sciences/ Healthcare team.

Meet the Quirem team

Alexandra Arranja
Alexandra Arranja Senior R&D Scientist
Alinde Smits
Alinde Smits QA/RA Support officer
Anet de Haan
Anet de Haan Finance Manager
Anneke Steenhuis
Anneke Steenhuis Company Secretary
Carla de Wals
Carla de Wals R&D Scientist
Diana Velthuis
Diana Velthuis Production & QC Chemist
Dilara Dandin
Dilara Dandin QA/RA Support officer
Eline Ekkelenkamp
Eline Ekkelenkamp Clinical Support Officer
Esther Fix
Esther Fix Project Leader
Feiko Tiessens
Feiko Tiessens Imaging Specialist
Gerbert Groot-Enzerink
Gerbert Groot-Enzerink Production & QC Chemist
Gerhard van Wolfswinkel
Gerhard van Wolfswinkel Manager PMO
Gerrit van de Maat
Gerrit van de Maat Manager Imaging & Software Solutions
Harald Bouman
Harald Bouman QA Manager
Ilona Lagerweij
Ilona Lagerweij Production & QC Chemist
Jerfaas Haalboom
Jerfaas Haalboom Supply Chain Manager
Jessica Versloot Stomp
Jessica Versloot Stomp Production & QC Chemist
John Mittendorf
John Mittendorf QA Manager
Jose van Ommen
Jose van Ommen Project Leader
Marloes Hackman
Marloes Hackman Production & QC Chemist
Martina Stella
Martina Stella Research Scientist
Matthijs Dijk
Matthijs Dijk Production & Quality Control Manager
Maurice Vink
Maurice Vink Jr. Product Manager
Nezar Nassar
Nezar Nassar Supply Chain Officer
Rachid El Khoulati
Rachid El Khoulati Hotlab Operations Officer
Rijk de Jong
Rijk de Jong Medical Director
Sander Poelert
Sander Poelert Manager Marketing & Product Management
Stuart Koelewijn
Stuart Koelewijn R&D Scientist Chemistry & Radiobiology
Tayser I. Yagob Mohamed
Tayser I. Yagob Mohamed Hotlab Controller & Research Support