This study will follow patients with hemophilia A, who have received a single intravenous administration of SPK-8011 or SPK-8016 in any prior Spark-sponsored SPK-8011 or SPK-8016 study. Subjects will be followed for up to a total of 5 years post infusion (including the time on the dosing study).
This long-term follow-up study will continue to evaluate the long-term safety and efficacy of SPK-8011 and SPK-8016 in males with hemophilia A, who have received a single intravenous administration of SPK-8011 or SPK-8016 in any Spark-sponsored SPK-8011 or SPK-8016 study.