GRM7 and presbycusis: Our results precludes a definitive clarification about the role of GRM7 as a possible genetic biomarkers for ARHL, although since the genotypes A/T and T/T have higher odds for HL than A/A genotypes, thus A allele could be pointed as protective biomarker for HL Nevertheless, the current state of knowledge regarding GRM7 impact in presbycusis is insufficient to make conclusions, and so, further large-scale studies are necessary to clarify this relation.