MTA-cooperative PRMT5 inhibitors such as BMS-986504/MRTX1719 and AMG 193 target the PRMT5-MTA complex, while inhibitors of the SAM synthetase methionine adenosyl transferase 2A (MAT2A), such as IDE397, deprive PRMT5 of its methyl donor SAM. In this review article, we summarize the mechanisms of action, preclinical data, and clinical data available thus far for these novel classes of oncology precision medicine and discuss potential future directions relevant to MTAP deletion as a promising synthetic lethal vulnerability for cancer therapy.