“…Appropriate staging examinations included full blood count (Xn, Sysmex, Norderstedt, Germany), lactate dehydrogenase, turbidimetric analysis for direct detection and quantification of monoclonal immunoglobulins (Cobas Systems, Roche Diagnostics, Mannheim, Germany), serum protein electrophoresis (Hydrasys, Sebia, Evry, France), imaging examinations (ultrasound of lymph nodes and abdomen or computed tomography) and, in selected cases, bone marrow biopsy to exclude any systemic lymphoma manifestations. Tumour stage and the appropriate therapy were established according to international recommendations (23) and the German guidelines for cutaneous lymphomas (24,25). Follow-up investigations included regular laboratory tests (blood and urine) with a varying panel of parameters.…”