- Additional highlights include pharmacodynamic biomarker analyses from ongoing trial of anti-CD137 antibody, ADG106, in combination with anti-PD-1 toripalimab -
In the first presentation of results from an ongoing dose-escalation trial of monotherapy in patients with advanced metastatic tumors, ADG116 demonstrated a strong safety profile and early signals of efficacy, including dose-dependent T-cell activation and tumor suppression in treatment-resistant “cold” and “warm” tumors such as pancreatic, ovarian and renal cell cancers.
Commenting on the findings, Dr.
Additionally, a separate poster presentation describing results of pharmacodynamic (PD) biomarker analyses reinforced the synergy and strong T-cell activation of ADG106 in combination with the anti-PD-1 antibody toripalimab.
A summary of data from both posters is included below.
Key findings from the poster (#137P) titled “Phase 1 dose-finding study of a novel anti–CTLA-4 antibody ADG116 as monotherapy in patients with advanced solid tumors” include:
- Clinical results from a global dose escalation and cohort expansion trial with sites in the
U.S.and Australia(ADG116-1003) evaluated ADG116 monotherapy in 25 heavily pre-treated patients with advanced metastatic solid tumors, the majority of which are insensitive to immunotherapy:
- Patients across 15 different tumor types were evaluated.
- The majority (68 percent) received three or more lines of prior systemic therapy.
- Nearly one quarter (24 percent) received prior immunotherapy treatment.
- ADG116 monotherapy was well-tolerated up to 6 mg/kg with only Grade 1 or 2 treatment-related adverse events (TRAEs) observed; rash (20 percent) and pruritus (20 percent) were the most common.
- In the ongoing 10 mg/kg cohort, a rash (Grade 3) and dose limiting toxicity event (Grade 4 hyperglycemia) occurred in a patient with renal cell carcinoma who relapsed on nivolumab. A significant increase in the patient’s CD8 T cells after one cycle of treatment showed that ADG116 is highly active for triggering T cell activation.
- ADG116 treatment resulted in dose-dependent increases in peripheral CD8 and CD4 T cells, indicating immune activation by targeting the CTLA-4 pathway, starting at a dose as low as 0.03 mg/kg and becoming more striking at the 6 mg/kg and 10 mg/kg dose levels. In one example, a patient refractory to multiple cycles of pembrolizumab treated at 0.03 mg/kg showed increased CD8 and CD4 T cells.
- In the dose escalation portion of the trial, four prolonged stable diseases were observed amongst these heavily pre-treated patients.
- Of special note is a 22 percent tumor reduction observed in target lesions (after the data cut-off on
October 15, 2021) following two cycles of ADG116 for a pancreatic cancer patient treated at 10 mg/kg. Only Grade 1 TRAEs were observed and the patient’s non-target lesion (23 x 12mm) disappeared. The patient continues on treatment.
- Additionally, an ovarian cancer patient treated at 6mg/kg showed stable disease for more than 116 days with increased CD8 and CD4 T cells. The patient continues on treatment.
- ADG116 demonstrated dose-proportional increases in drug exposure with a half-life supporting convenient dosing every three weeks.
The findings support that ADG116 has achieved the recommended dosing range as a single agent and for evaluation in combination therapy. The ADG116-1003 trial continues with dose escalation at 10 mg/kg, while cohort expansion has been initiated at 6 mg/kg.
Key findings from the poster (#43P) titled “Assessment of Biomarker Kinetics for ADG106 (anti-CD137 agonist) as monotherapy or combined with toripalimab” include:
- Results of PD biomarker analyses which demonstrated the synergistic effect of ADG106 in combination with an anti-PD-1 antibody, toripalimab, compared to ADG106 monotherapy at doses up to 3 mg/kg.
- The combination of ADG106 with toripalimab resulted in a 2-fold greater immune activation versus ADG106 alone. These results were observed even amongst patients who failed prior anti-PD-1 and CTLA-4 therapies.
- Soluble CD137 levels (sCD137) levels increased with immune activation suggesting this as a dose-dependent PD biomarker of T cell target engagement, which could be used to monitor potential clinical response.
- ADG106 treatment alone and in combination with anti-PD-1 therapy also increased serum IFN-γ, IL-6, natural killer cells, and T-cell subsets.
- Additional analyses demonstrate that the pharmacokinetic profile of ADG106 was not altered by the addition of toripalimab.
These findings highlight the synergistic activity of ADG106 in combination with the anti-PD-1 toripalimab for patients who failed anti-PD-1 and anti-CTLA-4 immunotherapies. This combination is being evaluated in the ongoing ADG106-1008 clinical trial, currently in a cohort dosing ADG106 at 3 mg/kg. The data support further exploration of combination therapy regimens with ADG106 at informed dose ranges for targeting biomarker enriched tumor types.
“The data presented today from two of our NEObody™ clinical programs show how we are creating transformative antibody-based immunotherapies that push the limits of antibody discovery and development, overcoming liabilities with some of the most promising yet challenging immuno-oncology targets today,” said
This NEObody program, targeting a unique epitope of CTLA-4, is being evaluated in patients with advanced/metastatic solid tumors. ADG116 is designed to enhance efficacy by potent Treg depletion in the tumor microenvironment (TME) and maintain its physiological function by soft ligand blocking to address safety concerns associated with existing CTLA-4 therapeutics.
This NEObody program is a fully human ligand-blocking, agonistic anti-CD137 IgG4 monoclonal antibody (mAb) that is being evaluated in patients with advanced solid tumors and/or non-Hodgkin’s lymphoma.
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Source: Adagene, Inc.