GRM5 and cancer: Expressed in cancerous tumors [10]. Cooperates with mGluR5 and γ-synuclein [11]. Involved in autophagy, mitochondrial metabolism, and ROS generation [12]. Regulates pro- and antiapoptotic processes [13]. Exosome-delivered α-synuclein inhibits liver cancer. α-Synuclein amyloids may affect cancer pathogenesis [14,15].