Sensorion SA announces that the first patient has been enrolled in its Phase 2a Proof of Concept clinical trial of SENS-401 (Arazasetron) in patients suffering from Cisplatin-Induced Ototoxicity. Cisplatin and other platinum-based compounds are essential chemotherapeutic agents for many cancers. A serious side effect of these therapies is ototoxicity, or permanent and irreversible hearing loss, which occurs in up to 50-60% of adult patients and 90% of pediatric patients who survive cancer.

This indication represents a very significant unmet need for patients and is a large potential market with an estimated incidence of more than 500,000 patients in the United States, the European Union and Japan. The exploratory Phase 2a, multicenter, randomized, controlled, open-label study, NOTOXIS, aims at evaluating the efficacy of SENS-401 to prevent ototoxicity induced by cisplatin in adult patients with a neoplastic disease. In a preclinical model of Cisplatin-Induced Ototoxicity (Petremann et al., 2017), SENS-401 demonstrated an ability to significantly reduce hearing loss.

Additionally, further analysis of the AUDIBLE-S study earlier in 2022, to assess the effect of SENS-401 in Sudden Sensorineural Hearing Loss (SSNHL) demonstrated a statistically significant and clinically meaningful treatment effect of at least 10 dB vs placebo with the high dose at Day 84 in the per protocol idiopathic SSNHL population (81 patients) treated with corticosteroids (representing c. 70% of the Intent to Treat population). These data have informed the NOTOXIS trial design to extend exposition to SENS-401 treatment, in order to cover all the cycles of cisplatin and to focus on the prevention of hearing loss. The NOTOXIS amended clinical trial application (CTA) was approved in October 2022 in France and in December 2022 in Israel.

Eligible participants will be randomized on Day 1 to either Arm A or Arm B in ratio 1:1 (the aim is to enroll maximum 58 participants in total: 29 participants per arm). Arm A participants will be treated with Cisplatin-based chemotherapy without receiving SENS-401. This control arm will provide natural history data.

Arm B participants will receive 43.5 mg of oral SENS-401 1 week prior to the initiation of the cisplatin treatment, during the whole duration of the chemotherapy treatment and 4 weeks after receiving the last cycle of cisplatin. The primary objective of the study will be to assess SENS-401 efficacy measuring the change from baseline of the average of the Pure Tone Audiometry (PTA) 4 weeks after the completion of cisplatin treatment. The trial will also assess a number of secondary outcome measures, including the rate and severity of ototoxicity, the change in PTA (dB) throughout the study and tolerance.

Sensorion anticipates the publication of interim data in H1 2023.