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Müther, M.* ; Böning, G.* ; Gildehaus, F.J.* ; Delbridge, C.* ; Albert, N.L.* ; Schäfers, M.* ; Delker, A.* ; Stegger, L.* ; Zeidler, R. ; Reulen, H.J.* ; Röll, W.* ; Stummer, W.*

P07.21.A A PHASE I TRIAL TO DETERMINE THE MAXIMUM TOLERATED DOSE AND PATIENT-SPECIFIC DOSIMETRY OF FRACTIONATED INTRACAVITARY RADIOIMMUNOTHERAPY WITH LUTETIUM-177 LABELED 6A10 FAB FRAGMENTS IN PATIENTS WITH GLIOBLASTOMA - PRELIMINARY RESULTS FROM THE FIRST PATIENT COHORT.

Neuro. Oncol. 27, iii81 - iii82 (2025)
DOI
BACKGROUNDFollowing maximal safe resection and standard adjuvant radio- and chemotherapy, approved maintenance therapies for glioblastoma are lacking. Intracavitary radioimmunotherapy (iRIT) injected into the resection cavity offers a promising strategy for improving local tumor. MATERIAL AND METHODSThe NOA-22 study (NCT05533242) investigates the 6A10-Fab fragment targeting carboxyanhydrase XII, labelled with lutetium-177, in a prospective, single-armed, multicenter phase I study setting, following a modified 3 + 3-design. Malignant glioma (WHO grades 3 + 4) IV and III) after concomitant radio-chemotherapy and adjuvant standard chemotherapy with no or small residual disease are included. The injected activity is adapted to the volume of the resection cavity, resulting in a dose of 44Gy (cohort 1), 48Gy (cohort 2) and 52Gy (cohort 3). Primary study objective is to determine the maximum tolerated dose and safety of adjuvant radio-immunotherapy with lutetium-177 labeled 6A10-Fab fragments. RESULTSThree patients with glioblastoma concluded the first study cohort. No toxicities beyond grade 2 (CTCAE Version 5) were noted. One patient presented with a symptomatic increase in focal contrast enhancement and perifocal edema that decreased after a course of steroid treatment, consistent with therapy-associated changes. Dosimetry did not reveal absorbed doses above upper dose limits for organs at risk. All patients remain clinically stable and without tumor progression. CONCLUSIONIntracavitary injection of Lutetium-177 labeled 6A10 Fab fragments appears to be feasible and safe. The study currently enrolls patients in a planned escalated dose scheme of 48 Gy cumulative dose in cohort 2.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Meeting abstract
Schlagwörter Lutetium
ISSN (print) / ISBN 1522-8517
e-ISSN 1523-5866
Zeitschrift Neuro-Oncology
Quellenangaben Band: 27, Heft: Supplement_3, Seiten: iii81 - iii82 Artikelnummer: , Supplement: ,
Verlag Oxford University Press
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Structural Biology (STB)