On September 26, 2018 NANOBIOTIX (Euronext: NANO – ISIN: FR0011341205), a late clinical-stage nanomedicine company pioneering new approaches to the treatment of cancer, reported it will present an update on and data from its NBTXR3 development program at the International Conference on Immunotherapy Radiotherapy Combinations that will take place from September 20 to 22, 2018 in Paris, France (Press release, Nanobiotix, SEP 20, 2018, View Source [SID1234529669]).
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Follow-up of Phase I/II in advanced Head and Neck cancers in elderly and frail patients ineligible for cisplatin or
intolerant to cetuximab In the Phase I part of this trial, which is conducted to determinate the recommended dose, 18 patients have been injected with NBTXR3. Follow-up of patients that received highest doses of NBTXR3 (15% and 22% dose levels) shows that every patient alive at the 12-month cut-off date was still alive after 23 months or more. At 26 months, one of the patients treated at the 15% dose level had died.
These data suggest the potential of NBTXR3 to impact survival for this advanced cancer patient population.
Immuno biomarker study in randomized phase II/III soft tissue sarcoma clinical trial Immunohistochemistry analyses revealed that, compared to radiation therapy alone (29 patients), NBTXR3 activated by radiation therapy (23 patients) increased the density of CD8+ T cell lymphocyte, and decreased FOXP3+ (Treg) into the tumors, while macrophage number remained relatively constant. These data indicate that NBTXR3 activated by radiation therapy could modulate the antitumor immune response.
In vivo investigation of NBTXR3 mode of action inducing distant immune response on CT26 tumoral model
Depletion experiment of CD8+ T cells (NBTXR3+3x4Gy+anti-CD8) induces a partial loss of tumor growth control of
treated tumors, and a complete abolition of the abscopal effect (distal tumors). This result indicates that the abscopal effect was driven by CD8+ T cells. Interestingly, depletion of CD4+ T cells (NBTXR3+3x4Gy+anti-CD4) increases the efficacy of NBTXR3 + radiation therapy at both sites (treated and distal tumors). As anti-CD4 treatment lead to Treg depletion (known to have a protumoral role), Treg depletion might have improved NBTXR3 radiation therapy treatment. These observations continue to support the rationale for the use of NBTXR3 activated by radiation therapy to seek to transform tumors