Cicalese MP, Ferrua F, Castagnaro L, et al. Update on the safety and efficacy of retroviral gene therapy for immunodeficiency due to adenosine deaminase deficiency. Blood. 2016;128(1):45-54.

In the Acknowledgments section on page 53 in the 7 July 2016 issue, support for Immacolata Brigida from the Italian Ministero della Salute (GR-2011-02346985) is missing. The error has been corrected in the online version, which now differs from the print version.