Pericardial events associated with ibrutinib-based therapies for chronic lymphocytic leukaemia in two landmark trials No β¦ β Evaluation of SΓ©zary cell marker expression and cell death behaviour upon in vitro treatment by flow cytometry in SΓ©zary syndrome patients Pericardial events associated with ibrutinib-based therapies for chronic lymphocytic leukaemia in two landmark trials β