Efficacy and safety of camrelizumab plus chemotherapy versus chemotherapy alone in patients with untreated, HER2-negative, unresectable locally advanced, or metastatic gastric cancer or gastroesophageal junction cancer: a retrospective comparative cohort study - Xiang, Jinyu; Gong, Wenjing; Sun, Ping; Wang, Xuan; Liu, Aina (Journal of Gastrointestinal Oncology; Vol 13, No 6 (December 28, 2022): Journal of Gastrointestinal Oncology, 2022)