EDNRB and neoplasm: In SKCM, which has the highest mutation burden among TCGA tumor types, the most highly overexpressed GPCRs (GPR143, EDNRB, and GPR56) are mutated in <2% of SKCM tumors, whereas frequently mutated GPCRs (e.g., GPR98, mutated in nearly 40% of tumors) typically have low expression.