In the present study, we show that FR effectively inhibits signaling in UM cells expressing Gαq-Q209L, Gαq-Q209P and Gα11-Q209L….In summary, the data presented here show that FR inhibits oncogenic Gαq/11-Q209 protein in vitro and in UM cells, promoting cell cycle arrest and eventual cell death, while also preventing the colonization of UM cells in 3D culture.