title: First report on a prospective trial with yttrium-90-labeled ibritumomab tiuxetan (Zevalin) in primary CNS lymphoma.
abstract: Most patients with primary CNS lymphoma (PCNSL) relapse after primary therapy. Standard salvage treatment has not yet been established in PCNSL. Anti-CD20 immunotherapy has expanded treatment options in systemic B-cell lymphoma; however, its use is limited by reconstitution of the blood-brain barrier after tumor shrinkage. The aim of this phase II trial was to evaluate the therapeutic efficacy, toxicity, and biodistribution of yttrium-90 ((90)Y) ibritumomab tiuxetan in PCNSL. Ten patients with relapsed PCNSL were included in a phase II trial and treated with the (90)Y-labeled anti-CD20 antibody ibritumomab tiuxetan. Nine patients actually received the planned radioimmunotherapy. In six patients, biodistribution of the antibody was measured by indium-111 ((111)In) ibritumomab tiuxetan whole-body scans and single-photon-emission CT (SPECT) of the brain. All patients were evaluated for toxicity and response at least 4 weeks after therapy. Four patients responded: one patient had a complete response lasting 30+ months, and three patients had short-lived responses of </=4 weeks. Five patients progressed, and one patient did not receive treatment due to an infection prior to (90)Y-antibody administration. Target accumulation of the antibody was demonstrated in four of the six patients examined by SPECT imaging with (111)In ibritumomab tiuxetan. All patients experienced grade 3/4 hematotoxicity but no acute neurotoxicity. Penetration of a therapeutic antibody into PCNSL and significant clinical activity was shown. Because of limited response duration and considerable hematotoxicity, future investigations should focus on a multimodal approach with additional chemotherapy and preferably autologous stem cell support.
authors.affiliation: Department of Hematology, Oncology, and Transfusion Medicine, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30/31, 12200 Berlin, Germany.
authors.forename: Sofiane
authors.initials: S
authors.lastname: Maza
authors.forename: Philipp
authors.initials: P
authors.lastname: Kiewe
authors.forename: Dieter L
authors.initials: DL
authors.lastname: Munz
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Korfel
authors.forename: Bernd
authors.initials: B
authors.lastname: Hamm
authors.forename: Kristoph
authors.initials: K
authors.lastname: Jahnke
authors.forename: Eckhard
authors.initials: E
authors.lastname: Thiel
mesh_terms: D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal / Q000493:pharmacokinetics / Q000627:therapeutic use*; D016543:Central Nervous System Neoplasms / Q000276:immunology / Q000473:pathology / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D016393:Lymphoma, B-Cell / Q000276:immunology / Q000473:pathology / Q000532:radiotherapy; D016403:Lymphoma, Large B-Cell, Diffuse / Q000276:immunology / Q000473:pathology / Q000532:radiotherapy; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000276:immunology / Q000473:pathology / Q000532:radiotherapy*; D011379:Prognosis; D011446:Prospective Studies; D016499:Radioimmunotherapy; D012074:Remission Induction; D015996:Survival Rate; D014018:Tissue Distribution; D015021:Yttrium Radioisotopes / Q000627:therapeutic use
chemical_list: D000911:Antibodies, Monoclonal; D015021:Yttrium Radioisotopes; C422802:ibritumomab tiuxetan