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Sorrento Therapeutics Releases Positive Results of Phase 1B Trial of Resiniferatoxin (RTX) Epidural in Cancer Patients with Reported Intractable Pain
SAN DIEGO, Sept. 22, 2020 (GLOBE NEWSWIRE) -- Sorrento Therapeutics, Inc. (Nasdaq: SRNE, "Sorrento") announced the public release of the results of its’ multicenter, open-label, Phase 1b Study to Evaluate Safety and MTD of Epidural Resiniferatoxin Injection for the Treatment of Intractable Cancer Pain, at the 14th Annual Pain Therapeutics Summit held virtually from September 21 to 22, 2020. Data was presented by Srdjan Nedeljkovic, MD, Associate Professor of Anesthesia, Harvard Medical School/Brigham & Women's Hospital. “We are extremely encouraged by the results of this initial study. Even in patients with high levels of pain, RTX given via an epidural injection has been found to reduce pain intensity without having any long-term adverse safety consequences,” said Associate Professor of Anesthesia, Srdjan S. Nedeljkovic, M.D. from the Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital at Harvard Medical School. “The patient population had intractable pain that did not respond to other standard therapeutic approaches, including opioids. The addition of RTX to the management of patients with intractable advanced-stage cancer pain offers the prospect of reducing suffering and improving quality of life for this underserved patient population”. This multicenter, open-label study enrolled 17 adults with intractable moderate to severe cancer pain. Subjects were treated with a one-time epidural administration of RTX at escalating dose level cohorts, ranging from 0.4 µg to 25 µg in 3 ml saline, in seven cohorts. The first participant in each cohort served as the “Sentinel” subject. The first two dosing cohorts (0.4 µg and 1.0 µg) each included one subject. Subsequent cohorts proceeded with three subjects each (2, 4, 8, 15 and 25 µg). Enrollment of dose escalation cohorts has completed, with 17 subjects receiving RTX. 65% were women and 35% were men. The median age was 58 years (range 28-82 years). The baseline numerical pain rating scale (NPRS) average score was a mean of 6.8 (standard deviation (S.D.) of 1.65), and the baseline NPRS worst score was a mean of 7.9 (S.D. of 1.26). No dose-limiting toxicities were reported. Dose escalation was completed at 25 ug. The most frequently reported treatment-emergent adverse event was transient post-procedural pain that was described in 47.1% of subjects. Post-injection-associated pain was managed with traditional short-term pain medications on the day of RTX injection. Typically, the RTX-associated pain following injection subsided before the 8-hour post-injection assessment and resolved within 24 hours in all subjects. Transient and reversible adverse events reported in at least two RTX-treated subjects were nausea (17.6%), vomiting (17.6%), and headache (17.6%). A total of 15 serious adverse events (SAEs) were reported, but none were deemed by the investigator to be related to RTX treatment. Most adverse events were attributed to the underlying cancer diagnosis. Clinical efficacy (CE) was assessed at three efficacy levels: CE30, CE50 and CE70, defined as a 30%, 50% and 70% decrease in pain, respectively, for three consecutive days from the original baseline NPRS score of ≥ 6/10. A positive outcome was observed in the lowest dose of RTX administered (0.4 ug) at the CE30 efficacy point. A dose-response relationship was observed, with the majority of responders at the 15 ug and 25 ug dose levels. Of the 17 subjects, 11 achieved the CE30 prespecified efficacy end-point using NPRS scores. Day 90 results for all RTX doses pooled are shown below:
PK data revealed no detectable drug in plasma in 15 of the 17 subjects. Minimally detectable levels of RTX were seen in 2 of the 17 subjects, in each case only at the initial post-injection time point. RTX administration was well-tolerated when given as a one-time epidural injection at doses up to 25 ug. Preliminary clinical pain improvement was observed in the dose-escalation phase. Based on the results, though the protocol allowed exploration of a 35 mcg dose for this indication, a dose beyond 25 mcg was not deemed necessary to qualify the safety and clinically meaningful efficacy of the drug. These preliminary data support further study of epidural RTX in a broader patient population with what would be considered moderate to severe pain associated with cancer in this orphan indication. Sorrento Investor Relations Site">For access to the poster associated with the scientific presentation, please visit Sorrento Investor Relations Site Sorrento intends to rapidly advance to larger scale trials and expects to submit a request to proceed with a multicenter, blinded, controlled Phase 3 trial to the FDA in the upcoming weeks. |
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Msg # | Subject | Author | Recs | Date Posted |
562 | Re: Sorrento Therapeutics Releases Positive Results of Phase 1B Trial of Resiniferatoxin (RTX) Epidural in Cancer Patients with Reported Intractable Pain | grepgrep | 3 | 9/22/2020 3:23:15 PM |