jondoeuk
2 years ago
Does this have any FDA approvals?
No. Plus they are currently focusing on TDT and SCD, both early stage, and both indications becoming more crowed. Also, CRSP should get FDA and EMA approvals for exa-cel in those indications and should have at least five years head start over others.
Will Precision Biosciences be this high or higher?
If the clinical data they present in April/May is good, I expect the SP will increase, but not as high as this. They (DTIL) will also have an upcoming R&D Day (focusing on in vivo programs) mid-year.
How do the two compare?
There are a number of differences. One example, DTIL have yet to show they can do in vivo editing in humans. Another, both have broad plans for in vivo programs, but delivery outside the liver (using current AAVs for many indications) can be problematic.
jondoeuk
3 years ago
From the PR: In these experiments, iPSCs were edited using the Companyβs SLEEK gene editing technology at the GAPDH locus with a proprietary, Editas-engineered AsCas12a nuclease to knock-in high-affinity CD16 and membrane bound IL-15. iPSC clones were then differentiated into iNKs that were confirmed to express high levels of CD16 and IL-15. Increasing NK cell CD16 expression can improve anti-tumour activity when combined with antibody-dependent cell-mediated cytotoxicity (ADCC)-enabling antibodies. IL-15 is important for NK cell survival, and increasing IL-15 expression prolongs the persistence of NK cells. Knock-in of IL-15 may also eliminate the need to administer cytokines systemically, which can cause severe toxicity.
Results demonstrated that the edited iNK cells exhibited enhanced serial tumour cell killing through ADCC in a2D assay against SKOV-3 ovarian cancer cells and in a 3D tumour spheroid killing assay. The edited iNK cells were also able to persist for a dramatically longer period of time relative to unedited iNK cells. Together, these data provide strong support for the continued development of engineered iPSC derived iNK cells as a potential novel class of therapeutics targeting solid tumours.
''In this promising new research, we demonstrate the use of our proprietary SLEEK technology to knock-in both CD16 and IL-15 into iNK cells. The engineered cells demonstrated potent anti-tumour activity and substantially increased persistence without systemic cytokines, an important limitation with many existing NK cell approaches. We also believe this to be a potentially safer and more reliable approach to developing next generation NK cell therapy medicines because through our iPSC development process, we only select cell clones that have exactly the desired on-target edits, thereby avoiding the possibility of cell abnormalities being introduced,'' said Mark S. Shearman, Ph.D., Executive Vice President and Chief Scientific Officer, Editas Medicine. ''NK cells are great candidates for off-the-shelf immunotherapy medicines given their high tumour killing capacity and their low propensity for graft-versus-host disease, and we believe these data provide evidence for the potential of future experimental medicines from our iNK program to exert enhanced anti-tumour activity in the clinic in the treatment of solid tumours.''
jondoeuk
3 years ago
Cancer is highly complex, so multiplexed gene editing will be needed to generate better cell therapies. One of the benefits of CRISPR is the ability to knockout multiple genes with (very) high efficacy, but that has not been the case for knock-ins. Now with this approach, it seems to have been overcome. If you take HLA-E, the efficacy (for knock-in) was over 88%, and this should 'shield' the majority of cells from being rejected by the patient they would be given to. ADAP will use the same approach for its iPSC-derived TCR-T cell therapies https://www.nature.com/articles/nbt.3860
jondoeuk
3 years ago
''New preclinical data demonstrated that SLEEK results in the knock-in of multiple clinically relevant transgenes through a proprietary process that selects for cells containing the knock-in cargo. In addition, high percentage knock-in efficiencies were enabled by Editas Medicineβs proprietary engineered AsCas12a nuclease. More than 90 percent knock-in efficiencies were observed in various clinically relevant target cells, including iPSCs, T cells, and NK cells. Additionally, SLEEK may be used to fine-tune the expression levels of transgene cargos, an important attribute of next-generation cell therapy medicines.'' https://www.globenewswire.com/news-release/2021/08/20/2284285/0/en/Editas-Medicine-Presents-Data-on-New-SLEEK-Gene-Editing-Technology-at-Cold-Spring-Harbor-Laboratory-s-Genome-Engineering-CRISPR-Frontiers-Meeting.html
Slides https://www.editasmedicine.com/wp-content/uploads/2021/08/2021_CSHL-CRISPR-Frontiers-SLEEK-Zuris_FINAL.pdf