Organising Committee of the Summer School Oncology 2026
Student Committee
For each edition of the Summer School of Oncology, a new committee of motivated medical students is formed to organize the program. The student committee plays a key role in shaping the Summer School, contributing fresh ideas and ensuring that the program remains relevant, engaging and well-organized.
The committee is responsible for coordinating the educational and scientific program, inviting speakers, organizing social activities and supporting participants throughout the week. By working closely with the academic staff, the student committee helps maintain the high quality and international character of the Summer School of Oncology!
Below, we proudly introduce the medical students who make up the organizing committee for the 2026 edition.
Nina Jansen – Chair
As the Chairwoman of the Summer School of Oncology, Nina holds overall responsibility for the organization and successful execution of the program. She is the primary point of contact and therefore oversees the student committee and ensures effective collaboration between students, academic staff, speakers and external partners. Throughout the preparation and during the Summer School itself, Nina provides leadership and guidance to the organizing committee, ensuring a well-structured course for all participants.
At 20 years old, Nina is in her third year of medical school. She works as a teamcaptain at Acutelines and in elderly care. Outside her studies, she loves staying active. You’ll often find her hockeying, wakeboarding, sailing, or running. She is very excited to meet you all in June!
Karen Spiering – Secretary
Karen is 22 years old and currently in her third year of medical school. Besides studying, she works as a student lecturer in medical physiology, where she loves sharing her passion for the human body.
In her free time, you’ll probably find her in the kitchen cooking or baking something delicious for friends and family. She can’t wait to meet you all this summer and maybe share a few recipes along the way.
Coosje de Groot – Treasurer
Coosje is 20 years old, and in her third year of her bachelor’s degree medicine. Besides managing the numbers and being part of the housing committee, Coosje works as a student at the kidney donation team, assisting during donation procedures. When she’s not in the hospital, you can probably find her behind the bar at a festival. Music is a huge part of her life, and she’s always up for a good time and some fun company.
Luc Zwiep – Education & Housing
Luc is a 22-year-old medical student with a great curiosity. He’s currently involved in breast cancer research and works at the DDG (GP emergency service Groningen). When he’s not studying or working, you’ll most likely find him reading a book, going for long walks, or enjoying a beer with friends at one of Groningen’s many cozy cafés.
He’s looking forward to welcoming you all this summer and ready to make sure your stay is comfortable and your week is filled with learning and good vibes!
Femke Kruisselbrink – Education programme
Femke is 19 years old and in the third year of her Bachelor of Medicine. Together with Luc and Floor, she is responsible for shaping the educational programme of the Summer School. She works at an administrative office and is currently also involved in research at the UMCG.
In her free time, Femke loves to go for a run, read a good book, or solve puzzles to unwind.
She’s excited to welcome you all this summer and make sure the academic programme will be both challenging and inspiring!
Floor Heering – Education & Scientific programmes
Besides studying as a third year medical student, Floor works as a research assistant at the Emergency Department of the UMCG and as a teaching assistant in Anatomy at the University of Groningen.
In her free time, you’ll often find her dancing, at the gym, or working at a cinema surrounded by fellow film enthusiasts.
She can’t wait to meet all participants this summer!
Carlotta Drewer – Scientific programme
Carlotta is a 20 year old third-year medical student. In addition to her medical studies, Carlotta works as a student assistant in statistics and is involved in integrating planetary health into the medical curriculum. She also participates in medical research at the UMCG. She enjoys dancing, doing all sorts of sports, and traveling. She looks forward to meeting you all at the Summer School!
Roos Minkema – PR & Acquisition
Roos is a third-year medical student who also works at the UMCG and in a nursing home. She is the president of the Liver Transplantation Student team and loves staying active; whether through sports, work, or new projects.
In her free time, Roos enjoys playing the piano, going for walks, having coffee, and spending time with friends on a terrace.
She can’t wait to meet everyone this summer!
Staff Committee
drs. Christian Hammer – Chair
drs. Christian Hammer is the chairman of the Summer School Oncology. He is involved in the Summer School Oncology since 2015. After some editions as treasurer, this is his second edition as chairman.
His specialties within the radiation oncology are urologic tumors and palliation. He is passionate about education and since one year principle educator of the department Radiotherapy in the UMCG.
Clara Lemstra
Clara Lemstra has been working as a Physician Assistant in the Department of Surgical Oncology at the University Medical Center Groningen since 2014. Her main area of focus is the treatment of melanoma, and she considers contact with patients to be the most enjoyable and valuable part of her profession.
Since 2016, she has been involved in the Summer School as a staff member, primarily contributing to the educational program. Her long-standing commitment reflects both her passion for education and her enthusiasm for sharing knowledge with others.
In addition to what she describes as the best job in the world, she enjoys outdoor swimming, hiking, and singing. Together with her husband, she has three adult children and is a proud grandmother to three granddaughters. She is very much looking forward to the Summer School.
dr. Annemarie Leliveld-Kors
dr. Annemarie Leliveld-Kors is an oncological urologist whose work focuses on the treatment of patients with bladder cancer. Every week, she performs bladder resections due to bladder cancer, an experience that has reinforced her conviction that prevention is one of the most powerful ways to save lives. She envisions a world in which people no longer smoke, recognizing smoking prevention as a crucial step in reducing the burden of bladder cancer.
At the same time, when surgery is necessary, she is committed to performing it in the most sustainable way possible. She is deeply aware that surgeons produce substantial waste and contribute significantly to the carbon footprint within hospitals. This awareness has shaped her commitment to advancing more sustainable surgical practices, combining high-quality patient care with responsibility for environmental impact.
Prof. dr. Geke Hospers
dr. Geke Hospers is a medical oncologist and has been emeritus professor since November 20, 2025. For nearly 40 years, she has been deeply involved in medical oncology at the University Medical Center Groningen. Her work has focused on treating patients with various types of cancer using systemic therapies and guiding them—and their families—through often long and challenging journeys. Throughout her career, she has come to understand that oncology is not only about medicine, but also about building trust, offering hope, and supporting people over many years. These relationships have been among the most meaningful aspects of her work.
Outside of medicine, she and her husband Piet raised five children, and they now enjoy being grandparents to six grandchildren, ages 9, 7, 5, 4, 3, and 2. Every two weeks, they spend time together with their grandchildren.
Her recent retirement marks a new chapter filled with new activities and opportunities, one of which is the upcoming Summer School 2026, which she looks forward to contributing to with enthusiasm.
dr. Gyuri Halmos
dr. Gyuri Halmos is an ENT specialist and head and neck oncologist, who is dedicated to helping patients every day and values being involved throughout the full course of care—from the beginning of diagnosis, through surgery when needed, and during follow-up after treatment. A strong commitment to high-quality care guides his work. While protocols provide an important foundation, the goal is always to tailor treatment to the possibilities and wishes of patients and their loved ones.
In addition to patient care, he is actively involved in several clinical and basic scientific research projects. Research is conducted through broad collaboration with colleagues and includes supervising PhD students, a role that is especially rewarding. The challenges of research continue to inspire critical thinking and ongoing development.
A third major area of commitment is education and training. As an academic physician, he is involved in the education of medical students, the residency training of future ENT specialists, and the fellowship training of head and neck surgeons. The Summer School Oncology is considered the icing on the cake: a unique and highly interactive educational experience, where working with enthusiastic and talented students is a true pleasure.
Prof. dr. Frank Kruyt
Prof. dr. Frank Kruyt is a molecular and cellular biologist and professor of experimental oncology at the department of medical oncology at the UMCG. His research focuses on understanding the biology that drives cancer in order to identify new therapeutic targets and translational research to study potential experimental therapies- particularly in brain tumours.
He is also an examiner, coordinator, and teacher in biology and biomedical research programs.
He has been actively involved in the Summer School Oncology for about 12 years. He looks forward to meeting you at the upcoming Summer School in Groningen!
dr. Jeroen Hiltermann
Jeroen Hiltermann has been working as a Pulmonary Oncologist in the Department of Pulmonary Diseases and Tuberculosis at the University Medical Center Groningen since 2008. His main focus is both the treatment of- and research into lung cancer. What he enjoys most is that, through studies, he is able to provide his patients with effective new treatments at an earlier stage.
He has been involved in lectures for the Summer School since 2008 and has been a staff member since 2025.
Femke van der Zant – previous chair SSO 2022
