MANAGEMENT OF IMMUNE CHECKPOINT INHIBITOR-RELATED PNEUMONITIS IN PATIENTS WITH ESOPHAGEAL CANCER: A NARRATIVE REVIEW WITH 3 ILLUSTRATIVE CLINICAL CASES AT VIETNAM NATIONAL CANCER HOSPITAL . YHCĐ. 2026;67(Số CĐ12- Bệnh viện Ung bướu Nghệ An). doi:10.52163/yhc.v67iCD12.6153