Warnings for Hepatitis B Reactivation in Cancer Patients Welcomed by the ... PR Newswire (press release) Share with Repost.us. ALEXANDRIA, Va., Sept. 30, 2013 /PRNewswire/ -- Food and Drug Administration (FDA) announced the requirement of a Boxed Warning for the anti-cancer immunosuppressive drugs Arzerra (ofatumumab) and Rituxan (rituximab). |