Serum markers and gastric cancer: an umbrella review. - Darvishi, Afra; Dadashzadeh Asl, Amirhosein; Golshaniniya, Pouya; Alipour, Ali; Naseri, Amirreza; Hamzehzadeh, Sina; Salehi-Pourmehr, Hanieh (BMC Gastroenterology, 2025)