Ordinary Members
| Full Name | Country | Institution | Project |
| Lucas Matthyssens | Belgium | Princess Elisabeth Children’s Hospital, Ghent University Hospital – Ghent, Belgium | SIOPEN (also member of IPSO and the Belgian Society for Pediatric Hematology & Oncology) |
| Jelena Roganovic | Croatia | Clinical Hospital Centre – Rijeka, Croatia | |
| Viera Bajciova | Czech Republic | Masaryk Institute of Oncology – Brno, Czech Republic | |
| Brice Fresneau | France | Department of Pediatric Oncology, Gustave Roussy – Villejuif Cedex, France | French Group on Rare Tumors in Children FRaCTurE (Groupe FRAnCais des TUmeurs Rares de l’Enfant) |
| Laurianne Lemelle | France | SIREDO Oncology Center (Care, Innovation and Research for Children and AYA with Cancer), Institut Curie, Paris, France | SFCE (renal tumors, bones tumors, supportive cares), SIOP member – YI |
| Coralie Mallebranche | France | Angers, France | French Group on Rare Tumors in Children FRaCTurE (Groupe FRAnCais des TUmeurs Rares de l’Enfant) |
| Aurore Pire | France | Hopital Necker enfants-malades – Paris, France | SIOP and IPSO member |
| Charlotte Rigaud | France | Department of Pediatric Oncology, Gustave Roussy – Villejuif Cedex, France | |
| Sabine Sarnacki | France | Necker-Enfants Malades Hospital – Paris, France | French Group on Rare Tumors in Children FRaCTurE (Groupe FRAnCais des TUmeurs Rares de l’Enfant) |
| Benedikt Bernbeck | Germany | Kilinikum Dortmund, Germany | STEP |
| Hans Christiansen | Germany | Hannover, Germany | German Rare Tumor Committee STEP (Seltene Tumoren in der Pädiatrie) |
| Martin Ebinger | Germany | Pediatric Hematology and Oncology, University Children’s Hospital Tübingen – Tübingen, Germany | German Rare Tumor Committee STEP (Seltene Tumoren in der Pädiatrie); Co-Chair CWS (Cooperative Weichteilsarkomstudiengruppe) |
| Tim Flaadt | Germany | Pediatric Hematology and Oncology, University of Tuebingen – Tuebingen, Germany | German Rare Tumor Committee STEP (Seltene Tumoren in der Pädiatrie) |
| Konrad Haug | Germany | Pediatric Hematology and Oncology, University Children’s Hospital Tübingen – Tübingen, Germany | German Rare Tumor Committee STEP (Seltene Tumoren in der Pädiatrie) |
| Felicitas Hippert | Germany | Kinderklinik Dortmund – Dormund, Germany | German Rare Tumor Committee STEP (Seltene Tumoren in der Pädiatrie) |
| Udo Kontny | Germany | Aachen, Germany | German Rare Tumor Committee STEP (Seltene Tumoren in der Pädiatrie) |
| Michael Ost | Germany | University Children’s Hospital Tuebingen – Resident physician in Pediatric Oncology / Haematology | GPOH (Gesellschaft für Pädiatrische Onkologie und Hämatologie) |
| Antje Redlich | Germany | Chair German Malignant Endocrine Tumour Registry (MET; Malignant Endocrine Tumours) – Augsburg, Germany | |
| Tristan Römer | Germany | University Hospital Aachen – Aachen, Germany | German Nasopharyngeal study group |
| Christian Seitz | Germany | University Children’s Hospital Tuebingen | STEP |
| Monika Sparber-Sauer | Germany | Olga Hospital, Klinikum Stuttgart – Stuttgart, Germany | Chair Cooperative Weichteilsarkomstudiengruppe (CWS) |
| Nikolaos Katzilakis | Greece | Consultant Paed Oncologist, Dept of Paed Haem/Oncology, University Hospital of Heraklion – Crete, Greece | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Charikleia Kelaidi | Greece | Athen, Greece | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Maria Kourti | Greece | Aristotle University of Thessaloniki – Thessaloniki, Greece | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Maria Lamprou | Greece | General Hospital – Thessaloniki, Greece | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Maria Nikita | Greece | Pediatric Oncologist, Oncology Department, Children’s Hospital Panagiotis and Aglaia Kyriakou – Athens, Greece | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Paraskevi Panagopoulou | Greece | Aristotle University of Thessaloniki – Thessaloniki, Greece | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Evgenia Papakonstantinou | Greece | Head of Pediatric Oncology Department, Head of the Oncology Committee Ippokration Hospital – Thessaloniki, Greece. | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Apostolos Pourtsidis | Greece | Mitera Children’s Hospital, Marousi Attica, Greece | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Vasiliki Sotiria Tzotzola | Greece | Aghia Sophia Children’s Hospital, Department of Pediatric Hematology-Oncology – Athens, Greece | Very Rare tumours working group of HeSPHO (Hellenic Society for Paediatric Haematology Oncology) |
| Rita Alaggio | Italy | Bambino Gesu’ Children’s Hospital – Pathology Departement – Rome, Italy | Italian national cooperative study TREP (Tumori Rari in Età Pediatrica, Rare Tumors in Pediatric Age) |
| Luca Bergamaschi | Italy | Istituto Nazionale Tumori INT – Milan, Italy | Italian national cooperative study TREP (Tumori Rari in Età Pediatrica, Rare Tumors in Pediatric Age) |
| Anna Campello | Italy | The Royal Marsden NHS Trust, Downs Road, Sutton, Surrey SM2 5PT | AIEOP (Italy) CCLG (UK) |
| Giovanni Cecchetto | Italy | Pediatric Surgery, Department of Pediatrics, Padova University Hospital – Padua, Italy | Italian national cooperative study TREP (Tumori Rari in Età Pediatrica, Rare Tumors in Pediatric Age) |
| Stefano Chiaravalli | Italy | Fondazione IRCCS Istituto Nazionale Tumori – Milan, Italy | Italian national cooperative study TREP (Tumori Rari in Età Pediatrica, Rare Tumors in Pediatric Age) |
| Maria Debora De Pasquale | Italy | Bambino Gesu’ Children’s Hospital – Pathology Departement – Rome, Italy | AIEOP (Italian Association of Pediatric Hematology and Oncology) |
| Daniela Di Carlo | Italy | Department of Pediatrics, Hematology-Oncology Division, Padova University Hospital – Padua, Italy | Italian national cooperative study TREP (Tumori Rari in Età Pediatrica, Rare Tumors in Pediatric Age) |
| Evelina Miele | Italy | Bambino Gesu’ Children’s Hospital – Rome, Italy | Italian national cooperative study TREP (Tumori Rari in Età Pediatrica, Rare Tumors in Pediatric Age) |
| Samuele Naviglio | Italy | Pediatric Hematology-Oncology, Institute for Maternal and Child Health IRCCS “Burlo Garofolo” – Trieste, Italy | |
| Arianna Tagarelli | Italy | Pediatric Oncology/Hematology Division, Women’s and Children’s Health Department, University of Padua – Padua, Italy | AIEOP, SIOP RTSG |
| Annalisa Trama | Italy | Fondazione IRCCS Istituto Nazionale Tumori – Milan, Italy | Evaluative Epidemiology Unit; RareCareNetwork |
| Jelena Rascon | Lithuania | Vilnius University Hospital Santaros Klinikos – Vilnius, Lithuania | |
| Aleksandra Jovanovska | Macedonia | Department of Hematology and Oncology, University Clinic for Children`s Diseases, Skopje – Macedonia | |
| Miranda Dierselhuis | Netherlands | Princess Maxima Center for Pediatric Oncology – Utrecht, Netherlands | |
| Sheila Terwisscha van Scheltinga | Netherlands | Princess Maxima Center for Pediatric Oncology – Utrecht, Netherlands | |
| Ida Katrine Knapstad | Norway | Oslo University Hospital, Depatment of Pediatric Oncology and Hematology, Dept. of Pedriatric Research – Oslo, Norway | NOPHO solid Tumor |
| Teresa Stachowicz-Stencel | Poland | Department of Pediatrics, Hematology and Oncology, Medical University of Gdansk – Gdansk, Poland | PPRSTG (Polish Rare Pediatric Tumor Study Group) |
| Malgorzata Styczewska | Poland | Medical University of Gdansk | |
| Anna Synakiewicz | Poland | Department of Pediatrics, Hematology and Oncology, Medical University – Gdansk, Poland | PPRSTG (Polish Rare Pediatric Tumor Study Group) |
| Jan Godzinski | Poland | Department of Pediatric Surgery, Marciniak Hospital – Wroclaw, Poland | PPRSTG (Polish Rare Pediatric Tumor Study Group) |
| Jean-Pierre Goncalves | Portugal | Portugese Institute of Oncology Francisco Gentil – Lisboa, Portugal | |
| Nuno Jorge dos Reis Farinha | Portugal | Hospital Center of Sao Joao (CHSJ) – Porto, Portugal | |
| Monica Désirée Dragomir | Romania | Institute of Oncology – Bucharest, Romania | SROHP (Romanian Society of Pediatric Onco-Hematology) |
| Rodica Voichita Cosnarovici | Romania | Oncology Institute “Prof. Dr. Ion Chiricuta” Cluj-Napoca – Cluj-Napoca, Romania | SROHP (Romanian Society of Pediatric Onco-Hematology) |
| Denis Kachanov | Russia | Russian Federation – Moscow, Russia | SIOP Renal Tumors Study Group |
| Pavel Bician | Slovakia | Children’s Faculty Hospital Banská Bystrica | SIOPEN |
| Alexandra Kolenova | Slovakia | National Institute of Children’s Disease – Bratislava, Slovakia | |
| Alicia Castañeda | Spain | Pediatric Cancer Center – Barcelona, Spain | SEHOP (Spanish Society of Pediatric Hematology and Oncology) |
| Gabriela Guillén Burrieza | Spain | Vall d´Hebron University Hospital – Barcelona, Spain | Grupo SEHOP (Tumores raros y Lesiones vasculares) |
| Fredrik Baecklund | Sweden | Karolinska University Hospital | VSTB – Vårdprogramsgruppen för solida tumörer hos barn |
| Gustaf Osterlundh | Sweden | Sahlgrenska University Hospital – Gotheburg, Sweden | |
| Nicolas Waespe | Switzeland | SPOG (Swiss Pediatric Oncology Society) | |
| Bilgehan Yalcin | Turkey | Hacettepe University Medical Faculty, Dept. of Pediatric Oncology | TPOG (Turkish Pediatric Oncology Group), SIOPEN, RTSG-SIOP, SIOP |
| Severyn Ferneza | Ukraine | Clinic for Pediatric Oncology and BMT, Western Ukrainian Specialized Children’s Medical Centre – Lviv, Ukraine | |
| Sam Behjati | United Kingdom | Wellcome Sanger Institute, UK Cambridge University Hospitals NHS Foundation Trust – , United Kingdom | UKCCLG (United Kingdom’s Children’s Cancer & Leukaemia Group) |
| Sarah Braungart | United Kingdom | Depatment of Pediatric and Neonatal Surgery and Urology Royal Hospital for Children – Glasgow, United Kingdom | SIOPEN (also member of IPSO and the CCLG UK) |
| Bernadette Brennan | United Kingdom | Royal Manchester Children’s Hospital – Manchester, United Kingdom | UKCCLG (United Kingdom’s Children’s Cancer & Leukaemia Group) |