The Incidence of Hepatitis B Reactivations in Patients Affected by Chronic Lymphocytic Leukemia With Ibrutinib

This observational retrospective study will enroll at least 158 patients affected by CLL with previous HBV exposure (HBsAg negative, anti HBc positive with or without anti-HBs) treated with Ibrutinib single agent according to the IWCLL criteria 2008. Patients will be divided in two cohorts one encompassing patients receiving lamivudine and the second one including patients who will not be given any prophylaxis. Each patient will be observed for one year from the first administration of Ibrutinib. The aim of the Study is to evaluate the incidence of HBV reactivation cases in patients affected by CLL treated with Ibrutinib.