³í¹®) Nivolumab versus chemotherapy in patients with advanced oesophageal squamous cell carcinoma refractory or intolerant to previous chemotherapy (ATTRACTION-3): a multicentre, randomised, open-label, phase 3 trial
¿¬¼¼¾Ïº´¿ø Á¾¾ç³»°ú Á¶º´Ã¶ ±³¼ö(»çÁø)