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Cancer Grand Challenges summit 2023

Extrachromosomal DNA

This conference took place in June 2025.

About

The first edition of the Cancer Grand Challenges Conference Series took place in June 2025 at The Royal Society. The event convened 160 researchers from around the globe to discuss extrachromosomal DNA (ecDNA) — a field that Cancer Grand Challenges brought into the spotlight by setting the extrachromosomal DNA challenge in 2020 and funding team eDyNAmiC, led by Paul Mischel

Researchers from diverse scientific backgrounds, came together to discuss emerging concepts, unanswered questions, and the future direction of the ecDNA field. With tools, datasets, and experimental models now sufficiently advanced, the meeting aimed not only to share cutting-edge science but also to strengthen an open and collaborative community to accelerate progress for patients. 

The programme included 18 invited speakers and 20 selected talks, spanning discussions on the basic mechanisms of ecDNA formation, maintenance, and function, including their roles in transcription, replication, and inheritance. Speakers also explored how ecDNAs contribute to tumour initiation, progression, evolution, and treatment resistance. In addition, the conference showcased pioneering technologies to generate and study ecDNAs, bioinformatic tools for their detection, and chemical probes to better understand and target them. 

The conference was sponsored by Boundless Bio and supported by American Friends of Cancer Research.

Programme

All talks will take place in the Wellcome Lecture Hall. Refreshments and the poster session will take place in City 1, 2 and 3, which are all found on the ground floor.

Scientific themes

ecDNA has emerged as one of the most pressing and challenging problems in cancer. ecDNAs, oncogene-containing circular DNA fragments found outside of chromosomes, play a crucial role in cancer development and progression. ecDNAs allow cancer cells to quickly evolve and adapt to changing environments and treatments, and thus are a significant clinical problem, as major contributors to treatment resistance and poor outcome. Conceptually ecDNA biology is fascinating – sitting at the interface of genetics and epigenetics. ecDNA biology is also vitally relevant - being linked to treatment resistance and poor outcome in patients. Understanding and exploiting ecDNA biology promises to transform the fundamental understanding of cancer and potentially revolutionise its treatment. 

Although first observed over 50 years ago, the importance of ecDNA in cancer has only recently come to light, with the field undergoing a revolution, making major leaps towards understanding mechanistically how ecDNAs form and function, how they evolve to resist treatment, how they impact the immune system, and critically how they can be effectively targeted therapeutically. 

Topics included:  

  • Exploring how ecDNAs originate  
  • Understanding how ecDNAs function  
  • How ecDNAs contribute to cancer development and evolution?  
  • How do ecDNAs contribute to therapy resistance?  
  • How does ecDNA evade and manipulate the immune system?  
  • Clinical impact of ecDNAs  
  • How can ecDNAs be targeted therapeutically?  
  • What tools are available to study ecDNAs? 

Scientific Steering Committee

This conference is being organised by a dedicated steering committee, chaired by:

Dr Paul Mischel

Meet the committee members below.

Event information

Get in touch

If you have any questions about this event, please send us an email at events@cancergrandchallenges.org. We'll endeavour to respond to you within two working days.
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Howard Change at Cancer Grand Challenges event
Team eDyNAmiC

Meet eDyNAmiC, whose challenge is to understand the biology of ecDNA generation and action, and develop approaches to target these mechanisms in cancer.