Are Patients with HHV-8 Associated Castleman Disease Successfully Treated with Rituximab at Risk of Subsequently Developing HHV-8 Negative (Idiopathic) Castleman Disease?

This is the first case describing the probable development of HHV-8-negative idiopathic MCD after HHV-8-associated MCD.Little is known of long-term outcomes of HHV-8-associated MCD and idiopathic MCD, necessitating periodic surveillance.HHV-8-negative idiopathic MCD patients are treated with siltuximab, an interleukin-6 inhibitor, unlike patients with HHV-8-associated MCD, who benefit most from rituximab.