MRTX9768 hydrochloride is a potent, orally active PRMT5 inhibitor. MRTX9768 hydrochloride is a synthetic lethal-based inhibitor binding the PRMT5-MTA complex[1].
MRTX9768 inhibits SDMA and cell proliferation in HCT116 MTAP-del cells (SDMA IC50 3 nM; prolif. IC50 11 nM) with marked selectivity over HCT116 MTAP-WT cells (SDMA IC50 544 nM; prolif. IC50 861 nM)[1].MRTX9768 selectively targets MTAP/CDKN2A-deleted tumors[2][1].
In xenograft studies, oral administration of MRTX9768 demonstrates dose-dependent inhibition of SDMA in MTAP-del tumors, with less SDMA modulation observed in bone marrow[1].
[1]. Christopher R. Smith, et al. Abstract LB003: Fragment based discovery of MRTX9768, a synthetic lethal-based inhibitor designed to bind the PRMT5-MTA complex and selectively target MTAP/CDKN2A-deleted tumors. AACR Annual Meeting 2021; April 10-15, 2021 and May 17-21, 2021; Philadelphia, PA.[2]. Yingqing Chen, et al. Targeting protein arginine methyltransferase 5 in cancers: Roles, inhibitors and mechanisms. Biomed Pharmacother. 2021 Oct 4;144:112252.

MRTX9768 inhibits SDMA and cell proliferation in HCT116 MTAP-del cells (SDMA IC50 3 nM; prolif. IC50 11 nM) with significant selectivity over HCT116 MTAP-WT cells (SDMA IC50 544 nM; prolif. IC50 861 nM)[1]. MRTX9768 selectively targets MTAP/CDKN2A-deleted tumors[2][1].

In xenograft studies, oral administration of MRTX9768 exhibits dose-dependent inhibition of SDMA in MTAP-del tumors, while showing reduced SDMA modulation in bone marrow[1].