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Nanobiotix Presents Successful Phase I Results for NBTXR3 at ASCO

Published: Tuesday, June 03, 2014
Last Updated: Tuesday, June 03, 2014
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Final results demonstrate a very good safety, treatment feasibility and promising signs of efficacy in patients with advanced Soft Tissue Sarcomas.

NANOBIOTIX has announced the successful completion of the first in human study of its lead NanoXray product, NBTXR3, which will be presented at the American Society of Clinical Oncology (ASCO) annual meeting.

The Phase I clinical study established that intratumoral injection of NBTXR3 followed by radiotherapy has a good safety profile in patients with locally advanced soft tissue sarcoma (STS), who have an important risk of relapse and few treatment options.

These results allow Nanobiotix to proceed to the pivotal phase, which is the final step leading to registration (CE mark).

The study showed that promising signs of antitumor activity for different sarcoma subtypes were observed. Interestingly, tumor shrinkage and pathological response were observed in well-known refractory tumors. All patients underwent a wide surgical resection. This optimal surgery impacts the local recurrence rate, improving patient prognosis since local disease control prolongs progression free survival and overall survival in high grade sarcomas.

Elsa Borghi, CMO of Nanobiotix said: “These results are really encouraging, the feasibility of injecting different sarcoma subtypes with varying volumes of NBTXR3 nanoparticles was tested in this phase I study and a very good tolerance was observed. We are pleased to announce that each patient has been successfully operated on. This has reinforced the fact that radiotherapy with NBTXR3 has the potential to be an effective pre-operative treatment and offer meaningful clinical benefit to patients with advanced Soft Tissue Sarcoma (STS). Now, further development of NBTXR3 is warranted and a pivotal trial is planned to start in Q4 2014.”

The study enrolled 20 patients who received a single intratumoral injection of NBTXR3, at escalating volumes, followed by standard radiotherapy (50Gy RTx), as indicated in this clinical setting.

Primary endpoints included feasibility of the intratumoral implantation and safety. Secondary endpoints focused on the efficacy such as pathological response and RECIST (Response Evaluation Criteria In Solid Tumors) response, including tumor volume evaluation. Moreover, IntraTumoral permanence of NBTXR3 and operability were assessed.

Key findings:

Feasibility of the NBTXR3 injection within the tumor mass across different tumor types and volumes (from 55.06ml to 3682.56ml) was demonstrated.
No leakage of NBTXR3 to the surrounding healthy tissues was confirmed.
• Persistence of NBTXR3 during all sessions of radiotherapy: optimal bioavailability over time.
• Appropriate dispersion of the product within the tumor: diffusion in 3 dimensions.
Very good tolerance and local safety of the product at volume 2.5%, 5%, 10% and 20% was observed.
Promising signs of antitumor activity were observed in different sarcoma subtypes, such as undifferentiated sarcoma, rhabdomyosarcoma, and synovial sarcoma.
The recommended volume for the pivotal study is 10%.

Laurent Levy, CEO of Nanobiotix commented: “The completion of this Phase I study is a very important milestone for Nanobiotix. The next step for us is to initiate a pivotal study for NBTXR3 in patients with advanced soft tissue sarcomas. We expect to start enrolling patients by the end of 2014. This successful feasibility of our NBTXR3 approach in cancer patients also encourages us to expand the use of NBTXR3 in other indications like head and neck cancer, liver cancer, glioblastoma, rectal cancer and prostate cancer, and to think about developments of our other products, NBTX-IV and NBTX-TOPO.”

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