A new open resource of patient-derived cancer models has enabled researchers to create the first large-scale map of the genes that cancers rely on to survive, offering new routes for research into better and less toxic treatments for patients.
Published in Nature, researchers from the Wellcome Sanger Institute, and their collaborators across five clinical sites in the UK, have developed a large biobank of tumour models, known as organoids.
The biobank is expected to have wide use, enabling scientists to identify the genes that specific cancers depend on for growth, revealing potential weak points that could be targeted with future treatments.
The study is published alongside two complementary papers from international collaborators, reflecting a wider multi-year effort to refine organoid models and make them more accessible to the research community.
For decades, cancer researchers have relied on two-dimensional (2D) cell lines to study cancer.
These workhorse models, in which cells are grown in a flat layer on laboratory plates, have provided important insights into cancer biology and remain widely used.
However, 2D models have limitations: they do not fully capture the diversity and complexity of tumours seen in patients and they have adapted to laboratory conditions over time.
Researchers are therefore increasingly looking to develop next-generation models that better reflect tumours found in patients, such as organoids, to complement 2D cell lines and help address some of these gaps.
In a new study, researchers from the Sanger Institute and collaborators created a large biobank of organoids, annotated with patient data, across five cancers where new treatments are needed: colorectal, oesophageal, pancreatic, stomach and ovarian.
They also sought to determine whether the biobank could help map the genes cancer cells need to survive and grow.
Working with researchers and clinicians across UK hospitals, fresh tumour samples donated by consenting patients were sent to the Sanger Institute, where cells were isolated and grown into organoid cultures.
The team developed 256 organoids across the five cancer types and sequenced DNA from the organoids, patient blood samples and original tumours where sufficient material was available.
This created a deeply characterised reference resource, allowing scientists to compare the models with original tumours and track changes as organoids are grown over time.In a first of its kind study in organoids, the researchers went on to use CRISPR screening, a method they used to systematically switch off genes one by one to see if the cells survived, in order to map the genes that are critical to cancer cell survival across 162 of the organoid models.
They identified thousands of genetic dependencies, including both common genes required by many cancers to survive, and more specific vulnerabilities linked to particular tumour types.
By combining these data with rich genomic and clinical information, the team found 1,733 links between genetic dependencies and specific features such as changes in DNA or treatment history.
This revealed new insights into how different cancers rely on specific biological pathways. The study also showed that the organoids closely matched the genetic features of the original tumours, confirming that they can be used as a reliable model for studying cancer.
In some cases, comparing organoids grown from the same patient before and after treatment helped researchers uncover how tumours developed resistance to therapy, while also revealing potential new weaknesses that could be explored with different treatment approaches.
This resource could help scientists prioritise new therapeutic hypotheses for cancers where better treatments are needed.
Rather than replacing traditional 2D cell lines, the organoid biobank complements them, helping researchers address areas where existing models are less informative. By linking patient-derived models with clinical and genomic data, this provides a powerful platform to bridge the gap between discoveries in the laboratory and patients.
Dr Carmen Herranz-Ors, first author at the Wellcome Sanger Institute, said: “By building this organoid biobank, which is a long-term resource of cancer models, we’ve created a powerful new way to study cancer in models that much more closely resemble patient tumours.
Applying CRISPR screening across these models enabled us to pinpoint the specific genes that different cancers rely on to grow and survive.”
Dr Catherine Elliott, Director of Research at Cancer Research UK, said: “Organoids give scientists the ability to study cancer in richer detail, giving them new insights into its weak spots. Research like this brings us closer to new treatments and with that the hope of more people living longer, better lives, free from the fear of cancer.”
All associated biobank data will be freely available online for the research community to access on the Cell Model Passports website
Organoids will be distributed by Merck, a life sciences reagent supplier and the non-profit repository American Type Culture Collection (ATCC).
