Article
作者: Lopez, Patricia  ; Liu, Qingyian  ; Slemmons, Katherine K.  ; Chen, Qing  ; Allen, Jennifer R.  ; Ponce, Manuel  ; Xie, Fang  ; Liu, Siyuan  ; Ngo, Rachel  ; Tamayo, Nuria A.  ; Pettus, Liping H.  ; Sharma, Pooja  ; Madoux, Franck  ; Hughes, Paul  ; Soto, Marcus  ; Ma, Vu  ; Li, Weikun  ; Cowland, Sanne  ; Belmontes, Brian  ; Butler, John  ; Wahlstrom, Jan  ; Lo, Mei-Chu  ; Kaller, Matthew R.  ; Vestergaard, Mikkel  ; Kohn, Todd  ; Frohn, Michael J.  ; Caenepeel, Sean  ; McCloud, Stuart  ; Sanders, Christiana  ; Wang, Paul  ; Manoni, Francesco  ; Lanman, Brian A.  ; Khetan, Jawahar  ; Mardirossian, Narbe  ; Policheni, Antonia  ; Medina, Jose  ; Ghimire-Rijal, Sudipa  ; Beylkin, Diane  ; Pickrell, Alex  ; Yang, Yajing  ; Sarvary, Ian  ; Booker, Shon K.  ; Andersson, Jan  ; Glad, Sanne  ; Mukund, Susmith  ; Minatti, Ana E.  ; Weires, Nicholas  ; Li, Kexue  ; Bruenner, Bernd  ; Tan, Hong  ; Bourbeau, Matthew  ; Amegadzie, Albert 
MTAP deletion occurs in 10-15% of all human cancers due to its proximity to the tumor suppressor gene CDKN2A. The loss of MTAP leads to accumulation of methylthioadenosine (MTA), which shares structural similarity to S-adenosyl methionine (SAM), the methyl donor for the cell-essential protein arginine methyltransferase 5 (PRMT5). By competing with SAM, MTA partially inhibits PRMT5, making MTAP-deleted tumors susceptible to further PRMT5 inhibition. Herein, we report the discovery of MTA-cooperative PRMT5 inhibitor AMG 193, a molecule that inhibited the proliferation of HCT116 MTAP-deleted cells with ∼40x selectivity over HCT116 MTAP-WT cells. AMG 193 was orally efficacious in mouse xenografts of endogenous MTAP-null tumors such as BxPC-3 (96% TGI @ 100 mg/kg QD) and U87MG (88% TGI @ 100 mg/kg QD). Preclinical data indicate that AMG 193 is brain-penetrant. AMG 193 is currently in Phase I/II clinical trials for the treatment of advanced MTAP-deleted solid tumors.