Sonnet BioTherapeutics Announces Updated Clinical Data for SON-1010 as Monotherapy or Combined with an anti-PD-L1, along with an Increase in the Dose-Escalation Target
Sonnet BioTherapeutics (NASDAQ:SONN) has announced updated clinical data for its drug candidate SON-1010, used as a monotherapy or in combination with atezolizumab (Tecentriq®). The trials have enrolled a total of 61 subjects with dose escalation continuing in SB101 and SB221 trials. SON-1010 showed no dose-limiting toxicities and revealed a 10-fold extended half-life compared to rhIL-12, prolonging IFNγ responses without cytokine release syndrome. Clinical benefits were observed in 35% of evaluable patients with advanced solid tumors. Both trials reported stable disease in 60% of patients at the first follow-up scan. Sonnet is increasing the target dose of SON-1010 to enhance efficacy.
SON-1010 was also tested in a Phase 1 trial (SB102) in healthy volunteers, showing a consistent safety profile. Sonnet’s Chief Medical Officer, Dr. Richard Kenney, emphasized the clean data generated for pharmacokinetic and pharmacodynamic analyses. The combination of SON-1010 with atezolizumab may benefit from turning 'cold' tumors 'hot,' upregulating PD-L1. The company plans to further test the drug in higher doses later this year and expects more updates early next year.
- No dose-limiting toxicities observed across all dose levels.
- 10-fold extended half-life for SON-1010 compared to rhIL-12.
- Observed clinical benefits in 35% of evaluable patients.
- 60% of patients had stable disease at the first follow-up scan.
- Clean pharmacokinetic and pharmacodynamic data generated in SB102 trial.
- SON-1010 targets tumor microenvironment effectively with FHAB® platform.
- Plan to further test higher doses of SON-1010 later this year.
- No patients reached a partial response by RECIST rules.
- Only 35% of patients showed clinical benefits at four months.
- Need to remove the monotherapy arm from Part 2 of SB221 study.
- Patients only achieved stable disease, not complete remission or significant tumor shrinkage.
- Continuous requirement to escalate doses to observe further efficacy.
Insights
The recent data on SON-1010, a variant of recombinant human interleukin-12 (rhIL-12), is exciting for several reasons. Firstly, the fact that the trials reported no dose-limiting toxicities or serious adverse events is significant, especially considering the historical challenges with rhIL-12's toxicity. The use of Sonnet's FHAB platform appears to have successfully extended the half-life and activity of IL-12 while minimizing adverse effects like cytokine release syndrome. This is important as it implies a potential new avenue for safer cancer treatments targeting the tumor microenvironment (TME).
On the clinical side, seeing a
For investors, the reported safety and efficacy data for SON-1010 is a positive indicator for Sonnet BioTherapeutics. The absence of dose-limiting toxicities across multiple trials helps de-risk the development process, increasing the likelihood of progressing to later-stage trials. The partnership with Genentech, a member of the Roche Group, further validates the potential of SON-1010, offering not only financial stability but also the technical expertise to navigate complex regulatory landscapes.
However, it's important to note that Sonnet remains in early-stage trials and significant milestones like Phase 2 and Phase 3 trials are yet to be achieved. This means the company will likely continue to require substantial funding to advance its clinical programs. Investors should keep an eye on cash burn rates and potential dilution from future funding rounds.
From a clinical perspective, the data on SON-1010 is noteworthy. Historically, interleukin-12 (IL-12) has shown promise in preclinical settings but has been hampered by severe toxicities in human trials. The extended half-life and tumor-targeting abilities of SON-1010, due to the Fully Human Albumin Binding (FHAB) platform, seem to mitigate these issues, offering a safer profile for patients. The stable disease observed in 60% of patients at first follow-up and the
Ultimately, the true test will be in larger, randomized controlled trials to confirm these findings. The combination of SON-1010 with atezolizumab also opens doors to potentially more effective combination therapies, particularly in refractory cancers. Clinicians will watch closely for updates on the expanded cohorts and subsequent phases to better understand its full potential and long-term benefits.
- The SON-1010 studies have together enrolled 61 subjects, to date, as dose escalation continues in SB101 and SB221 at higher levels
- Patients have received up to 25 cycles of SON-1010 as monotherapy and 10 cycles of SON-1010 with atezolizumab (Tecentriq®) without dose-limiting toxicity at any dose level
- Cytokine data reveals about 10-fold extended half-life for SON-1010 compared with rhIL-12 that induces prolonged and controlled IFNγ responses, with no evidence of cytokine release syndrome at any dose
- Clinical benefit was seen at four months post-initiation of dosing in
35% of evaluable patients (8/23) with advanced solid tumors
PRINCETON, NJ / ACCESSWIRE / May 20, 2024 / Sonnet BioTherapeutics Holdings, Inc. (NASDAQ:SONN) (the "Company" or "Sonnet"), a clinical-stage company developing targeted immunotherapeutic drugs, announced today that the safety of SON-1010 dosing has been formally reviewed in both of the current Phase 1 clinical trials and the Company is now increasing the target dose of SON-1010 during dose escalation. SON-1010 is a proprietary version of recombinant human interleukin-12 (rhIL-12), configured using Sonnet's Fully Human Albumin Binding (FHAB®) platform, which extends the half-life and activity of the IL-12 component due to binding native albumin in the serum and targets the tumor microenvironment (TME) by strongly binding gp60 and Secreted Protein Acidic and Rich in Cysteine (SPARC). SB101 is a Phase 1 multiple-ascending dose (MAD) trial in adult patients with advanced solid tumors (NCT05352750) that commenced in Q2 2022 and is currently enrolling the sixth dose cohort. SB221 is a Phase 1b/2a dose-escalation and proof-of-concept study of the combination of SON-1010 with atezolizumab (in collaboration with Genentech, a member of the Roche Group), in a study focused on platinum-resistant ovarian cancer (PROC) (NCT05756907) that started in Q4 2023, now enrolling the fourth dose cohort. In addition, SON-1010 was studied in SB102, which was a Phase 1 single-ascending dose (SAD) trial in healthy volunteers (NCT05408572) that started in Q3 2022; the results were recently published (Kenney, et al, Frontiers in Immunology, 2024).
Safety in both of the active cancer trials has been reviewed by their respective Safety Review Committees at each step during dose escalation. Both trials use a ‘desensitizing' first dose to take advantage of the known tachyphylaxis with rhIL-12, which minimizes toxicity and allows higher maintenance doses. No dose-limiting toxicities or related serious adverse events have occurred to date. The safety and toxicity profile that has developed is typical for a Phase 1 oncology trial, with the majority of adverse events (AEs) being reported as mild. All have been transient, with no evidence of cytokine release syndrome. Of the 25 cancer patients dosed to date and evaluable for follow-up at this latest cutoff, 15 (
"We have now dosed 18 cancer patients at increasing SON-1010 drug levels in the SB101 study, completed dosing in 31 healthy volunteers in SB102, and are rapidly filling the dose-escalation cohorts with 12 subjects enrolled in the first four cohorts of the SB221 combination study," said Richard Kenney, M.D., Sonnet's Chief Medical Officer. "The overall safety and toxicity profile for SON-1010, primarily including local reactions, headache, myalgia, and fatigue, mimics the published experience with rhIL-12, which prompted us to raise the target dose to enhance potential efficacy. The SB102 study allowed us to generate clean data for the pharmacokinetic (PK) and pharmacodynamic (PD) analyses, enabling simulation of the effect of multiple doses with the help of a continual reassessment model of PK and PD. This modeling suggests target-mediated drug disposition (TMDD), which supports the mechanism of the FHAB being directed to tumor tissue. The combination of SON-1010 with atezolizumab may benefit from the ability of IL-12 to turn ‘cold' tumors ‘hot', which upregulates the amount of PD-L1 in the TME."
One patient with progressive endometrial sarcoma receiving SON-1010 monotherapy in SB101 had stable disease (SD) for almost 2 years before progressing - her ascites had resolved and tumors had shrunk at one point but she never reached a partial response (PR) by Response Evaluation Criteria in Solid Tumors (RECIST) rules. Cytokine analysis following each dose in that study revealed controlled and prolonged induction of interferon gamma (IFNγ) that peaked at 24 to 48 hours and returned to baseline within 2 to 4 weeks. A small increase in IL-10 was observed with each dose as expected in response to IFNγ. There was either a minimal or no signal for IL-1β, IL-6, IL-8, and TNFα, and there was no indication of any potential for cytokine release syndrome (CRS) at these doses. One patient in Part 1 of SB221 with uterine sarcomas received 8 cycles of the SON-1010/atezolizumab combination therapy every 3 weeks before progressing; another two have received 8 and 10 cycles, respectively, and are continuing on the study. The stable AE profiles despite dose escalation led us to reevaluate the target dose, so the Company has added groups in both studies to evaluate 1200 ng/kg SON-1010 as a maintenance dose (the molar equivalent of 800 ng/kg rhIL-12). Finally, Part 2 of the SB221 combination study has been trimmed to remove the monotherapy arm.
"The findings to date in these two trials represent significant progress for the SON-1010 molecule", said Robert Wenham, M.D., Chair, Department of GYN Oncology at Moffitt Cancer Center and the Lead Principal Investigator for SB221. "Multiple strategies to present IL-12 safely have been tried over the past two decades with little evidence of improved tolerability in humans, yet the preclinical models continue to suggest that induction of IFNγ in the TME can activate an effective anti-tumor response. This also results in the local induction of PD-L1. Adding a cohort to increase the target MTD of SON-1010, an extended PK molecule that is concentrated in the TME, is the right approach at this stage. This will provide a chance to study the safety of SON-1010 monotherapy in SB101, and then in combination with atezolizumab in SB221, along with the clinical effect of the combination on PROC in a limited set of subjects in the expansion cohort later this year. Defining the best dose for SON-1010 is required to allow a direct randomized comparison of the strategy with the standard of care therapy in Part 2."
"We are very pleased with the data we are seeing at these higher dose levels of SON-1010, with safety and tolerability being well within expected levels, as well as displaying SON-1010 extended PK/PD, tumor targeting, and clinical activity during treatment," said Pankaj Mohan, Ph.D., Sonnet Founder and Chief Executive Officer. "Research on rhIL-12 in humans has been hindered by toxicity for decades. We believe that the IL-12 component in SON-1010 is presented in a way that is safer, due to the longer half-life, and it is concentrated in the tumor, due to the recurrent binding of the FHAB-associated albumin to SPARC in the TME. It is important to note that many of these patients have been fighting their cancers for a very long time and have exhausted all approved treatment regimens available to them, so seeing tumor shrinkage at any dose is both difficult to achieve and encouraging for future results. We are excited to continue testing the impact of SON-1010 in combination with atezolizumab at these higher dose levels in patients with PROC, who represent a significant unmet medical need, and we expect to have a further update early next year."
About SON-1010
SON-1010 is a candidate immunotherapeutic recombinant drug that links unmodified single-chain human IL-12 with the albumin-binding domain of the single-chain antibody fragment A10m3. This was selected to bind both at normal pH, as well as at the acidic pH typically found in the TME. The FHAB technology targets tumor and lymphatic tissue, providing a mechanism for dose sparing and an opportunity to improve the safety and efficacy profile of not only IL-12, but a variety of potent immunomodulators that can be added using the platform. Interleukin-12 can orchestrate a robust immune response to many cancers and pathogens. Given the types of proteins induced in the TME, such as the Secreted Protein and Rich in Cysteine (SPARC) and glycoprotein 60 (GP60), several types of cancer such as non-small cell lung cancer, melanoma, head and neck cancer, sarcoma, and some gynecological cancers are particularly relevant for this approach. SON-1010 is designed to deliver IL-12 to local tumor tissue, turning ‘cold' tumors ‘hot' by stimulating IFNγ, which activates innate and adaptive immune cell responses and increases the production of Programed Death Ligand 1 (PD-L1) on tumor cells.
About the SB101 Phase 1 Trial
This first-in-human study is primarily designed to evaluate the safety of multiple ascending doses of SON-1010 in cancer patients and will be conducted at several sites across the United States. While the optimal dose is unknown at this stage, the potential to target tumors, the extended PK mechanism and our preclinical data suggest the therapeutic dose may be lower compared to native human IL-12. The study, utilizing a standard 3+3 oncology design in at least five cohorts, should establish the MTD and the recommended Phase 2 dose (RP2D) using monthly subcutaneous injections of SON-1010. The primary endpoint explores the safety and tolerability of SON-1010, with key secondary endpoints intended to measure pharmacokinetics (PK), pharmacodynamics (PD), immunogenicity, and anti-tumor activity. This study will form the basis for potential combinations with other types of immunotherapies and the future development of bispecific candidates using the FHAB platform.
About the SB221 Phase 1b/2a Trial
SB221 is a global Phase 1b/2a multicenter, dose-escalation and randomized proof-of-concept study to assess the safety, tolerability, PK, PD, and efficacy of SON-1010 administered subcutaneously (SC), either alone or in combination with atezolizumab given intravenously (IV). The study is designed in Part 1 to rapidly establish the maximum tolerated dose (MTD) of the combination in patients with advanced solid tumors at the lower dose levels. The focus shifts to PROC at higher dose levels using small dose-escalation groups with expansion of the dataset at the recommended Phase 2 dose (RP2D). This would be followed in Part 2 by an assessment in patients with PROC of the potential for improved efficacy of the combination versus the standard of care. Both companies look forward to this collaboration as an opportunity to improve outcomes for patients with ovarian cancer.
About Sonnet BioTherapeutics Holdings, Inc.
Sonnet BioTherapeutics is an oncology-focused biotechnology company with a proprietary platform for innovating biologic drugs of single or bifunctional action. Known as FHAB (Fully Human Albumin Binding), the technology utilizes a fully human single chain antibody fragment (scFv) that binds to and "hitch-hikes" on human serum albumin (HSA) for transport to target tissues. Sonnet's FHAB was designed to specifically target tumor and lymphatic tissue, with an improved therapeutic window for optimizing the safety and efficacy of immune modulating biologic drugs. FHAB is the foundation of a modular, plug-and-play construct for potentiating a range of large molecule therapeutic classes, including cytokines, peptides, antibodies, and vaccines.
Tecentriq® (atezolizumab) is a registered trademark of Genentech, a member of the Roche Group.
Forward-Looking Statements
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Sonnet BioTherapeutics Investor Contact
Jack Yauch
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862-754-1024
jyauch@soleburystrat.com
SOURCE: Sonnet BioTherapeutics Holdings, Inc.
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