Agenus Publishes BOT+BAL Study Data for Treatment-Refractory HCC
Agenus announced the publication of Phase 1b data evaluating botensilimab, an Fc-enhanced anti-CTLA-4 antibody, in combination with balstilimab, an anti-PD-1 antibody, in patients with treatment-refractory hepatocellular carcinoma who had progressed following prior immunotherapy. The manuscript, titled "A phase 1b study of botensilimab and balstilimab in treatment-refractory hepatocellular carcinoma," was published in Liver Cancer and is available at DOI: 10.1159/000551630. The publication reports results from an expansion cohort of the Phase 1b C-800-01 study in 19 patients with HCC who had progressed on or after prior immunotherapy. The cohort represents a difficult-to-treat population for which prospective data remain limited, including 47% of patients with albumin-bilirubin grade 2 liver function, a marker of poorer liver reserve and prognosis in HCC. In published HCC studies, ALBI grade 2 liver function has been linked to a 4- to 10-month decrement in median overall survival compared with ALBI grade 1, underscoring the poor prognosis and reduced responsiveness typically observed in this population.i Among 18 efficacy-evaluable patients, BOT+BAL demonstrated an objective response rate of 17%, including one complete response and two partial responses. The 18-week clinical benefit rate was 50%. Median duration of response was not reached, median progression-free survival was 4.4 months, and median overall survival was 12.3 months. All patients had received prior anti-PD-1 therapy, 68% had received prior tyrosine kinase inhibitors, and 58% had received prior atezolizumab/bevacizumab. One patient experienced stable disease for 66 weeks, supporting the conclusion that benefit with BOT+BAL was not confined to RECIST response alone. Treatment options after immune checkpoint inhibitor therapy in advanced HCC remain limited, and available systemic therapies have generally shown modest activity. Published studies evaluating lenvatinib, cabozantinib and regorafenib after ICI-based therapy have reported objective response rates of 6-14%, median progression-free survival of approximately 4-5 months and median overall survival of less than or equal to10.5 months.ii The BOT+BAL results therefore, provide early prospective evidence of activity in a post-ICI HCC population that included patients with adverse prognostic features often underrepresented in later-line studies.
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- Significant Clinical Response: Among 113 patients treated with BOT+BAL, the AI-identified subgroup exhibited a 64% response rate compared to just 9% in the remaining cohort, highlighting TARIO-2's potential in identifying patients likely to benefit from treatment.
- Improved Survival Rates: In the MSS metastatic colorectal cancer cohort without active liver metastases, the AI-identified subgroup had a median overall survival not reached, with a hazard ratio of 0.18, indicating TARIO-2's significant predictive power for survival outcomes.
- Innovative Technology Application: The TARIO-2 model analyzes standard H&E pathology images to extract biologically relevant tumor microenvironment features, offering a patient stratification strategy that does not rely on complex tissue profiling, which could transform clinical practices.
- Future Validation Plans: Agenus is set to present these findings at the 2026 ASCO Annual Meeting, aiming to validate TARIO-2 as an image-based biomarker strategy for BOT+BAL, thereby advancing the clinical development of immunotherapy.
- Clinical Trial Results: Agenus' Phase 1b trial data reveals that in 19 patients with treatment-refractory hepatocellular carcinoma (HCC), the combination of BOT and BAL achieved an objective response rate of 17%, including one complete response and two partial responses, indicating potential efficacy in this challenging patient population.
- Survival Analysis: Among 18 efficacy-evaluable patients, the median overall survival was reported at 12.3 months, despite 47% of the cohort having ALBI grade 2 liver function, which typically indicates poorer prognosis, thus highlighting the potential of BOT and BAL in improving survival outcomes.
- Safety Assessment: The safety profile of BOT and BAL in HCC patients was consistent with prior studies, with 68% of patients experiencing immune-mediated adverse events and no treatment-related deaths, suggesting that the combination is manageable and suitable for further investigation.
- Future Research Directions: Investigators noted that the BOT and BAL combination demonstrated promising efficacy and manageable safety in post-immunotherapy HCC patients, supporting continued exploration in this area to assess its applicability in a broader patient population.
- Earnings Announcement Timing: Agenus (AGEN) is set to release its Q1 2023 earnings report on May 11 before the market opens, drawing significant attention from investors regarding its performance and future outlook.
- Earnings Expectations: The consensus EPS estimate stands at $2.10, with revenue expectations at $129.5 million, metrics that could directly influence investor confidence and market sentiment.
- Historical Performance Review: Over the past year, Agenus has only surpassed EPS and revenue estimates 25% of the time, indicating considerable volatility in its performance, which may affect market expectations for future results.
- Market Reaction Potential: Given Agenus's inconsistent performance in exceeding expectations, investors should closely monitor the upcoming earnings report to assess its potential impact on stock price and the necessity for strategic adjustments.
- Financial Results Announcement: Agenus plans to release its Q1 2026 financial results before the market opens on May 11, 2026, which is expected to provide investors with the latest insights into the company's financial health, potentially impacting stock price movements.
- Annual Shareholder Meeting: The company will host a webcast in June in conjunction with its Annual Meeting of Shareholders, focusing on key strategic priorities and upcoming data milestones, aimed at enhancing investor confidence and attracting more attention.
- Clinical Trial Progress: Approximately 1,200 patients have been treated with botensilimab and balstilimab in phase 1 and phase 2 clinical trials, demonstrating clinical responses across nine metastatic late-line cancers, which may lay the groundwork for the company's future market performance.
- Development Capabilities: Agenus boasts a comprehensive pipeline of immuno-oncology agents and robust development capabilities, leveraging its clinical and commercial cGMP manufacturing facilities, which may position the company favorably in future market competition.
- Significant Disease Control: A clinical trial for gastroesophageal cancer combining botensilimab (BOT), balstilimab (BAL), and agenT-797 demonstrated a 77% disease control rate, with long-term survival exceeding 20 months in a subset of heavily pretreated patients, indicating the potential of this combination therapy in refractory cases.
- Improved Survival Rates: Patients receiving induction therapy had a median progression-free survival (PFS) of 6.9 months compared to 3.5 months for those without induction, with a hazard ratio (HR) of 0.19 and a p-value of 0.015, underscoring the importance of immune activation and treatment sequencing.
- Enhanced Long-Term Survival: In the induction cohort, 43% of patients were alive at both 12 and 18 months, compared to only 20% and 0% in the non-induction group, highlighting the effectiveness of the induction strategy in improving long-term survival outcomes.
- Insights into Immune Mechanisms: The study revealed that the combination of BOT, BAL, and agenT-797 significantly promoted intratumoral T cell and dendritic cell infiltration, leading to the formation of organized tertiary lymphoid structures, providing crucial insights for further exploration of the biological basis of this therapy.
- Earnings Estimate Revisions: Analysts have raised their earnings estimates for Agenus, projecting a quarterly EPS of $1.95, reflecting a remarkable 289.3% increase from the previous year, indicating a significant enhancement in the company's profitability that could drive further stock price appreciation.
- Zacks Rank Upgrade: Due to the positive revisions in earnings estimates, Agenus currently holds a Zacks Rank #1 (Strong Buy), a rating tool that has demonstrated an average annual return of 25% since 2008, showcasing strong investment potential.
- Full-Year Earnings Outlook: The full-year EPS estimate for Agenus stands at $1.30, representing a 151.8% increase from last year, with no negative revisions in the past month, reflecting strong analyst confidence in the company's future performance.
- Stock Price Uptrend: Over the past four weeks, Agenus's stock has risen by 14%, closely tied to the upward revisions in earnings estimates, suggesting that further upside potential remains, making it a candidate for investors to consider adding to their portfolios.








