
κ-Opioid receptor in the nucleus is a novel prognostic factor of esophageal squamous cell carcinoma
Keywords: DOR, δ-opioid receptor; ERK, extracellular regulated protein kinase; ESCC, esophageal squamous cell carcinoma; GPCRs, G-protein–coupled receptors; GSK3β, glycogen synthase kinase-3beta; KOR, κ-opioid receptor; MAPK, MAP kinase; MOR, μ-opioid receptor; NSC