KSQ boosts PARP inhibition in animal models of ovarian and breast cancers with USP1 inhibitor – FierceBiotech
Posted: October 25, 2020 at 5:52 am
PARP inhibitors like Lynparza from Merck and AstraZeneca have been effective in some patients with ovarian and breast cancers, but many develop resistance to the drugs, and some people dont respond at all. KSQ Therapeutics hopes to provide hope for those patients with a first-in-class drug that may be able to boost Lynparzas effectiveness when used in combination with itand the company has rolled out promising animal data to back up that strategy.
KSQs drug inhibits ubiquitin specific peptidase 1, an enzyme that has been shown to promote the survival of cancer cells by facilitating DNA repair. The drug, dubbed KSQ-4279, inhibited tumor growth both on its own and when combined with Lynparza in mouse models of ovarian and triple-negative breast cancers, the company reported during a presentation at the EORTC-NCI-AACR Symposium on Molecular Targets and Cancer Therapeutics.
KSQ discovered the drug using a technology platform it calls CRISPRomics, which allows its researchers to identify therapeutic targets by applying CRISPR-Cas9 gene editing to the whole genome. The company has used the platform to study 20,000 human genes in 600 cancer models.
RELATED: KSQ grabs $80M to move T-cell treatment for PD-1 resistance into the clinic
PARP inhibitors work by interrupting DNA repair, but KSQs researchers believe KSQ-4279 inhibits different yet complementary DNA repair pathways, said the companys chief scientific officer, Frank Stegmeier, Ph.D., in a statement.
In multiple animal models of ovarian cancer and triple-negative breast cancer, combining KSQ-4279 with Lynparza was more effective than either drug on its own. The combo approach prompted a complete response in some of the breast cancer models.
PARP inhibitor combinations are gaining steam in the oncology market. In May, the FDA approved a combination of Lynparza with Roches VEGF inhibitor Avastin to treat ovarian cancer with or without BRCA mutations.
Last year, Yale University researchers discovered that AstraZenecas experimental VEGF inhibitor cediranib also prevents DNA repair. The researchers suggested that cediranib could make tumors more responsive to Lynparza and other PARP inhibitors.
As for KSQ, it has grown quickly over the last few years, raising $76 million in 2017 and another $80 million a year later to advance its lead programs, one of which is a T-cell therapy for solid tumors that are resistant to PD-1 immune checkpoint inhibitors. KSQ-4279 is now its lead program, and the new data in ovarian and breast cancers give the company confidence to advance the drug into clinical trials as a novel agent in a new class of targeted oncology treatment, Stegmeier said.
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KSQ boosts PARP inhibition in animal models of ovarian and breast cancers with USP1 inhibitor - FierceBiotech
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