RT Journal Article SR Electronic T1 Response to targeted therapy or chemotherapy following immunotherapy in patients with gastrointestinal cancers - a case series JF Journal for ImmunoTherapy of Cancer JO J Immunother Cancer FD BMJ Publishing Group Ltd SP 162 DO 10.1186/s40425-019-0637-6 VO 7 IS 1 A1 Rayan Alsuwaigh A1 Joycelyn Lee A1 Gloria Chan A1 Cheng Ean Chee A1 Su Pin Choo YR 2019 UL http://jitc.bmj.com/content/7/1/162.abstract