This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as: Türe Z, KAlin-Unuvar G, Kahveci HN, Keklik M, Ulu-Kilic A. Overlooked prophylaxis of Hepatitis B in patients undergoing hematopoietic stem cell transplantation. Erciyes Med J 2020;