Sama, Shashank Hyperprogression in PDL1 Expressive, Recurrent Gastroesophageal-junction Adenocarcinoma After Pembrolizumab. [electronic resource] - Cureus Jun 2019 - e4862 p. digital Publication Type: Case Reports; Journal Article ISSN: 2168-8184 Standard No.: 10.7759/cureus.4862 doi