Acute polyradiculopathy secondary to idelalisib in Relapsed Classical Hodgkin's lymphoma.

Patients with relapsed or refractory Hodgkin's lymphoma are likely incurable with standard treatment. Idelalisib, a delta-isoform specific Phosphatidyl-inositol-3-kinase (PI3K) inhibitor has shown its efficacy in other hematopoietic B malignancies. We report the case of a 51-years old patient with relapsed and refractory Hodgkin's Lymphoma receiving idelalisib after several regimens of chemotherapy. He achieved a good partial response for several months, unfortunately, idelalisib had to be stopped because of the onset of a severe polyradiculoneuritis attributed to this treatment. We assume here that the polyradiculoneuritis could be caused by T cell mediated autoimmunity to myelin proteins. To our knowledge, this adverse event has never been described so far with idelalisib.