Nanobiotix Establishes Recommended Dose for Planned Registrational Study Evaluating NBTXR3 Plus Anti-PD-1 for Patients With Metastatic Head and Neck Cancer Resistant to Prior Immunotherapy

Regulatory News:

NANOBIOTIX (Euronext: NANO –– NASDAQ: NBTX – the ‘‘Company’’), a late-clinical stage biotechnology company pioneering physics-based approaches to expand treatment possibilities for patients with cancer, today announced determination of the recommended phase 2 dose (RP2D) of NBTXR3 in combination with pembrolizumab or nivolumab for the treatment of patients suffering from inoperable locoregional recurrent (LRR) or recurrent and metastatic (R/M) head and neck squamous cell carcinoma (HNSCC) that is resistant to prior immunotherapy. RP2Ds were determined for NBTXR3 plus pembrolizumab or nivolumab for patients with LRR or R/M HNSCC that has not received prior immunotherapy, lung metastases (mets) from any primary tumor, or liver mets from any primary tumor as well.

The combined dose escalation and dose expansion parts of Study 1100 are expected to enroll up to 141 patients. The complete dose escalation part enrolled 29 patients in three cohorts: (i) head and neck lesions from LRR or R/M HNSCC eligible for anti-PD-1 therapy; (ii) lung mets from any primary cancer eligible for anti-PD-1 therapy; and (iii) liver mets from any primary cancer eligible for anti-PD-1 therapy. Study participants received a one-time intratumoral injection of NBTXR3 prior to their first radiotherapy session. They then received radiotherapy, followed by anti-PD-1. Based on the study’s results, the RP2D for all three cohorts was determined to be 33% of gross tumor volume.

Nanobiotix aims to deliver an industry-leading head and neck cancer treatment franchise powered by NBTXR3, and to replicate that approach across other solid tumor indications. Pursuant to this strategy, the Company has amended the ongoing expansion phase of Study 1100 to further strengthen the rationale behind a registrational protocol evaluating NBTXR3 plus anti-PD-1 for patients with R/M HNSCC that is resistant to prior immunotherapy.

The amended dose expansion part of study 1100 also has three cohorts, however the cohorts have been re-designed to further explore NBTXR3 plus anti-PD-1 in several immunotherapy-eligible indications, with a particular focus on the treatment of patients with LRR or R/M HNSCC primary lesions that are either naïve or resistant to prior immunotherapy. The expansion part cohorts are as follows: (i) LRR or R/M HNSCC that is resistant to prior immunotherapy; (ii) LRR or R/M HNSCC that has not received prior immunotherapy; (iii) lung, liver, or soft tissue mets from inoperable NSCLC, malignant melanoma, hepatocellular carcinoma, renal cell carcinoma (RCC), urothelial cancer, cervical cancer, or triple negative breast cancer (TNBC) primary tumors.