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 Chronic Lymphoid Leukemia (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 into two cohorts, one encompassing patients who received lamivudine and the second one including patients who received no prophylaxis. Each patient will be observed for one year from the first administration of Ibrutinib.