In addition, FCN-159 potently inhibited tumor growth in two patient-derived xenograft (PDX) models bearing NRAS mutation…FCN-159 can be a novel and effective targeted monotherapy and potentially in combination to treat patients with advanced solid tumors. A Phase I clinical trial of FCN-159 is ongoing in China to treat patients with NRAS-aberrant (Ia) and NRAS-mutant (Ib) advanced melanoma (NCT03932253).