Centre for In Vivo Modelling Service Core

At the Centre for In Vivo Modelling (CIVM), we combine advanced animal genetics and cutting-edge technologies to drive cancer research. Our multidisciplinary team specialises in the generation and maintenance of genetically engineered mouse models (GEMMs), humanised mouse strains, and patient-derived models (xenografts and organoids), using innovations such as CRISPR gene editing, embryo manipulation, and in vivo genetic screening. We develop and cryopreserve new cancer models that closely replicate human disease, supporting translational studies that inform effective therapies. Our approach integrates rigorous scientific standards, ethical oversight, and collaborative expertise, aiming to accelerate progress in understanding cancer biology and developing better treatments for patients.

Our Centre is dedicated to driving innovation and excellence in cancer research through advanced in vivo modelling. We work in close collaboration with the ICR researchers and clinicians at The Royal Marsden to generate genetically engineered mouse models (GEMMs) and patient-derived models, such as patient-derived xenografts (PDXs) and patient-derived organoids (PDOs) to interrogate cancer biology in its own ecosystem. By leveraging these sophisticated in vivo systems, the Centre aims to:

  • Develop innovative cancer models in collaboration with ICR researchers to advance cancer research and drug discovery.
  • Work in partnership with The Royal Marsden Hospital to obtain patient samples and generate new patient-derived cancer models for translational studies.
  • Foster close interdisciplinary collaboration with drug discovery teams to leverage these in vivo models in the creation and testing of next-generation anti-cancer therapies.
  • Continuously improve the sophistication and relevance of our cancer models, ensuring they more faithfully recapitulate the complexity of human disease and enhance the translational impact of our research.

 

Our services

Advantages of cryopreserving your strains:

  • Allows you to save space, by getting the mice you need, when you need;
  • Reduces your animal costs;
  • Reduces animal use;
  • Reduces risk from disasters (e.g. disease outbreaks, breeding cessation, equipment failures, genetic contamination, natural disasters, etc…).

 What can be cryopreserved?

  • Mouse Sperm
  • Mouse Embryos
  • Mouse Embryonic Stem Cells
  • Mouse Oocytes

 Sperm Cryopreservation:

Description: Sperm is retrieved from the epididymal tissues of 3 male mice and is cryopreserved in 20 to 30 straws that are stored in liquid-phase, liquid nitrogen across two tanks in two separate locations (SRD and CCDD), to ensure sample safety and mitigate risks associated to unexpected or uncontrollable events.

Material needed: 3 males, reproductively active, 12-25 weeks old

Timeline: 2-6 weeks (dependant on QC method of choice)

Considerations: this method of cryopreservation is rapid and cheap; however, it only preserves half of the genome. This method is only recommended for single mutations on a common inbred background.

Quality Control: we provide different levels of Quality Control (QC) for different price ranges.

  1. Test thaw QC: we will thaw 1 straw the day after cryopreservation and visually assess motility and viability of the recovered sperm
  2. IVF and culture to blastocyst QC: we highly recommend this QC step. In addition to test thaw, we will also perform IVF and culture embryos up to blastocyst stage. We will provide the investigator with a fertility rate (%) for the recovered sperm. We will charge an extra cost to cover the IVF procedure.
  3. IVF and embryo transfer QC: In addition to test thaw, we will perform IVF and transfer 2-cell embryos into up to 3 pseudopregnant females to generate viable embryos/live pups. We will charge an extra cost to cover the IVF and embryo transfer procedures.

    Please note that we require you to provide your genotyping protocol, as well as full detail of the genetic content of each strain that you submit for cryopreservation.

Diagram of Sperm Cryopreservation

Embryo Cryopreservation:

Description: Female mice are hormonally superovulated and oocytes are retrieved for in vitro fertilisation (IVF) with sperm from donor male. Resulting embryos are placed in cryoprotectant and loaded into multiple straws, which are gradually cooled and stored in liquid-phase liquid nitrogen in two separate tanks.

Material needed: Donor male and 8-10 donor females

Timeline: 12-15 weeks

Diagram of Embryo Cryopreservation

Embryonic Stem Cells Cryopreservation:

Not available, yet.

Oocyte Cryopreservation:

Not available, yet.

Cryostorage:

If you have cryopreserved mouse sperm/embryo/oocytes at another institution, we can cryostorage your samples for an annual fee. We do require that the investigator takes charge of shipping costs into our facility, and that thawing and genotyping protocols are submitted to the CIVM.

The CIVM stores all samples in liquid-phase liquid nitrogen tanks (CryoPlus1, ThermoFisher Scientific). Material retrieved from each strain is split between 2 tanks, a main and a backup tank, for redundancy. For additional safety, these 2 tanks are located in two separate buildings at ICR Sutton. Both tanks are continuously monitored by T-scan alarm systems and undergo annual service, as well as daily visual inspections.


 

Sperm Cryorecovery:

Description: Frozen sperm is cryorecovered by IVF, followed by embryo transfer. We can purchase wild-type female oocyte donors of the same genetic background, or alternatively the investigator can provide homozygous oocyte donors of the same strain.

Material needed: straw with frozen sperm and 8 to 12 females for IVF, 7-16 weeks old.

Timeline: 12-15 weeks

Diagram of Sperm Cryorecovery

 

Embryo Cryorecovery:

Description: Frozen 2-cell embryos are thawed and transferred into pseudopregnant females.

Material needed: straw(s) with frozen 2-cell embryos

Timeline: 8-10 week


Oocyte Cryorecovery:

Not available, yet.

 

Mouse rederivation

Description: Mouse rederivation is a process used to produce pathogen-free mouse colonies by removing microbial contaminants from existing lines. The procedure can be performed either through natural mating or in vitro fertilization (IVF):

  • In natural mating, embryos are obtained from donor mice and transferred into pathogen-free recipient females.
  • In IVF-based rederivation, fertilized embryos are created in vitro using gametes from donor mice and then implanted into clean recipient females.

Both methods effectively eliminate pathogens, allowing safe importation of mouse strains from lower health-status facilities into the ICR BSU. Samples from both litter and recipient mother will be sent for Health Screening and the associated costs will be charged separately to the Investigator.

Material needed: For IVF-based rederivation we require the investigator to provide 2 males, reproductively active, 12-25 weeks old, and the CIVM will purchase wild-type female egg-donors. Alternatively, if maintaining homozygosity is essential, the investigator will need to provide additional 6-10 females, 7-16 weeks old.

Timeline: 12-15 week

Mouse Rederivation Mating Diagram

Mouse Rederivation IVF diagram

We are currently setting up CRISPR/Cas9-based gene editing protocols. Soon, you’ll be able to apply for projects that involve developing new alleles based on:

  • Knockout by indel formation
  • Knockout by precise deletion
  • Conditional knockout
  • Knock-in of point mutations
  • Knock-in of small tags
  • Large knock-in
  • Exon replacement

These alleles will be developed based on Electroporation of Microinjection of CRISPR/Cas9 system reagents.

We will collaborate with you to design the best strategy and help you generate the genetically engineered mice you need for your project. 

We also provide:

  • Development of humanised mouse strains
  • Development of Patient-derived xenografts (PDX) and organoid models

Latest ICR News

21/04/26

Scientists from The Institute of Cancer Research (ICR), London, are taking part in a groundbreaking new set of brain cancer clinical trials designed to improve survival and quality of life for people with glioblastoma.

The trials form part of a £6.9 million initiative funded by Yorkshire Cancer Research and led by experts at the University of Sheffield and the University of Glasgow. The work aims to transform how cancer drugs are tested for people with recurrent glioblastoma, enabling faster access to promising new treatments. Scientists from the Clinical Trials and Statistics Unit at The Institute of Cancer Research (ICR) will play a key role in the initiative.

Glioblastoma is the most common and fastest‑growing type of brain cancer, with most people experiencing recurrence within a year of diagnosis. Many cancer drugs are ineffective because they cannot reach the tumour due to the blood‑brain barrier, contributing to a lack of major treatment breakthroughs for the disease since 2007. New approaches to clinical trials are urgently needed to identify which drugs can reach the brain and work effectively.

Testing treatments earlier 

The trials will allow people to begin treatment before surgery, creating a ‘window of opportunity’ to analyse tumour tissue removed during the operation. This enables researchers to rapidly assess which drugs reach the tumour and show promise. Patients can then continue effective treatments or stop those that are unlikely to work, helping to avoid unnecessary side effects and move on to alternative options more quickly.

Delivered through dedicated Centres of Excellence for brain cancer, the trials will be offered to people with recurrent glioblastoma in Sheffield, Leeds and Hull, as well as Edinburgh, Manchester and Nottingham. These centres bring together the NHS, researchers, industry and people affected by cancer, allowing patients to access innovative treatments closer to home.

People affected by brain cancer have played a vital role in shaping how the trials will be designed and delivered, ensuring the needs and experiences of patients and families are central to decision‑making throughout.

Addressing regional inequalities

Survival rates for glioblastoma in Yorkshire are often lower than the national average, and people in the region have historically had fewer opportunities to take part in clinical trials. This new initiative aims to tackle these inequalities by improving access to research and engaging communities that are under‑represented in cancer trials, including Black and South Asian communities and those experiencing high levels of deprivation.

Mr Ola Rominiyi, Clinical Lecturer in Neurosurgery at the University of Sheffield and Neurosurgical Resident at Sheffield Teaching Hospitals NHS Trust, said: “Current treatments for fast‑growing brain cancers are not good enough, and people in Yorkshire have historically had fewer opportunities to take part in research. Boldly supported by Yorkshire Cancer Research, this initiative is a vital step forward, giving more people access to promising new treatments and hope where options have too often been limited.”

'We're excited about the potential of this approach'

Professor Christina Yap, Professor of Clinical Trials Biostatistics at The Institute of Cancer Research, London, and trial methodology lead, said: “This initiative introduces a next‑generation approach to early‑stage glioblastoma research, using innovative trial methods to learn much more quickly whether a new treatment can reach the brain and show real promise for patients. By building in regular decision points, the trials allow us to move effective therapies forward faster, while stopping those that aren’t working, so time, effort and resources are focused where they can have the greatest impact. This kind of adaptive, data‑driven approach is essential for accelerating progress for people with brain cancer, where new treatment options are urgently needed.”

“We're incredibly grateful to Yorkshire Cancer Research for funding EPIC-GB. I’m honoured to serve as the lead statistician, and it has been a real privilege to co-design this ambitious and innovative brain cancer platform trial. We’re excited about the potential of this approach to accelerate the identification of promising treatments for patients with brain cancer and giving hope where options have too often been limited.”

Dr Stuart Griffiths, Director of Research, Policy and Impact at Yorkshire Cancer Research, said: “For far too long, people with glioblastoma have faced limited treatment options. This initiative opens new opportunities for people with recurrent disease – including those under‑represented in research – to trial potentially life‑extending treatments. It reflects our commitment to bringing innovative clinical trials to Yorkshire, so people in the region can be among the first to benefit from cancer breakthroughs.”

The trials also involve researchers from other UK centres, including Glasgow, helping ensure that progress made through this work can benefit people with brain cancer across the UK.

 'Research like this is the only way to give families more time to make memories together'

After being diagnosed with brain cancer in January last year and facing limited treatment options in Yorkshire, 47‑year‑old mum‑of‑two Emma Ward from York travelled abroad to access an immunotherapy treatment, funded by £145,000 raised by friends and family.

She said: “With no further options for me in the UK, all I could think about was the extra time this treatment might give me with my husband and daughters. My friends did everything they could, and I was overwhelmed by their kindness – but it shouldn’t have to be like this. Too many people lose their lives because there are so few options for treating brain cancers.

“For families like mine, time means everything. Research like this is the only way to give families more time to make memories together. I want my husband and daughters to remember the trips we took, the laughter and the happy times we shared as a family – and only through more research can we give families more of those moments.”