GammaTile and Stupp in Newly Diagnosed GBM

In summary, standard of care postoperative chemoradiation for patients with newly diagnosed GBM does not routinely provide durable local control or prolonged overall survival. As discussed above it seems unlikely that patient outcomes will be significantly improved with radiation dose escalation given at the time of the EBRT boost. However, as most failures are local, improving LC could potentially improve the OS of patients. To do this, we propose a shift in the traditional radiation paradigm. This study will assess the feasibility and tolerability of adding GT radiation therapy as an upfront boost at the time of maximum safe resection, along with the backbone of the current standard of care approach, concomitant and adjuvant temozolomide +/- TTF, for patients with newly diagnosed GBM. GT, a novel brain brachytherapy device utilizing Cs-131 embedded in bioresorbable collagen tiles, offers a more sophisticated carrier and a shorter half-life radioisotope, Cs-131. Use of this device allows for radiation initiation at an earlier time point and a more rapid dose delivery and possibly more effective tumor control particularly for rapidly proliferating tumors such as GBM. Two prospective studies have demonstrated the safety and efficacy of re-irradiation with GT in patients with recurrent GBM. The overarching goal of this single-arm, open label phase 4 study is to determine the feasibility and tolerability of treating patients with GammaTile in combination with the Stupp Protocol and how to proceed with testing this treatment in a future, larger, randomized clinical study. The aims of the study are to demonstrate that the use of GammaTile at the time of surgery is well tolerated and does not delay the start of the Stupp protocol. Efficacy outcomes (e.g., LC, OS, PFS) will also be described.

NCT Number	NCT05342883
Lead Sponsor	GT Medical Technologies, Inc.
Conditions	Glioblastoma
Enrollment	61 participants
Start Date	2022-08-17
Primary Completion	2027-12-01 (estimated)
Study Completion	2027-12-01 (estimated)
Updated on ClinicalTrials.gov	2025-09-05