RT Journal Article SR Electronic T1 PD-1 inhibitors provide new opportunities in conversion therapy for stage IV gastric cancer JF Cancer Biology & Medicine JO Cancer Biology & Medicine FD China Anti-Cancer Association SP 565 OP 568 DO 10.20892/j.issn.2095-3941.2022.0244 VO 19 IS 5 A1 Han Liang YR 2022 UL http://www.cancerbiomed.org/content/19/5/565.abstract AB