1 Department of Diagnostic Imaging, Sheba Medical Center, Ramat Gan, Israel.
2 Sackler School of Medicine, Tel-Aviv University, Tel Aviv, Israel.
3 Statistics Consulting Unit, Rabin Medical Center, Beilinson Campus, Petah Tikva, Israel.
4 Medicine A, Beilinson Hospital, Rabin Medical Center, Petah Tikva, Israel.
5 Oncology Department, Hospital de la Santa Creu i Sant Pau, Institut d'Investigació Biomèdica Sant Pau, and Universitat Autònoma de Barcelona, Barcelona, Spain.
6 Princess Margaret Cancer Centre, Division of Medical Oncology, University of Toronto, Toronto, Ontario, Canada.
This study describes sources of initial safety signals that that preceded US Food and Drug Administration (FDA) drug safety communications and examines their associations with drug characteristics and subsequent label changes.