Eli Lilly Zepbound-Taltz Combo Delivers 31.7% ACR50 Response in Phase 3b Trial

LLYLLY

Eli Lilly reported Phase 3b trial results showing Zepbound plus Taltz delivered a 31.7% ACR50 response versus 0.8% for Taltz alone in psoriatic arthritis, a 64% relative improvement with mild-to-moderate adverse events. The dual therapy’s superior efficacy for comorbid arthritis and obesity may expand Eli Lilly’s market for both drugs.

1. Lilly Stock Regains Investor Attention

Following a prolonged period of subdued trading, Eli Lilly shares have come back into focus as market participants revisit the company’s long-term growth thesis. Technical analysts highlight a breakout from a 12-month consolidation range, prompting swing traders to employ strategies such as selling into intra-day strength, trimming positions on renewed weakness and cutting losses quickly when price dips exceed predefined thresholds. Trading volumes over the past two weeks have averaged 25% above the 50-day norm, suggesting renewed investor conviction in Lilly’s late-stage pipeline and upcoming data readouts.

2. Anchor Investment Propels Aktis Oncology IPO

Eli Lilly’s strategic anchor investment in Aktis Oncology contributed to the biotech’s oversubscribed initial public offering, which raised $318 million in gross proceeds. The collaboration, valued at up to $1.2 billion, centers on the development of alpha-emitting radiopharmaceuticals targeting solid tumors. Lilly’s participation underscores its commitment to expanding into precision oncology and enhances the visibility of its radiopharma platform, providing potential royalty streams and milestone payments tied to Aktis’ lead candidates AKY-1189 and AKY-2519.

3. AI-Driven Biologics Collaboration with Chai Discovery

Eli Lilly announced a partnership with Chai Discovery to deploy a purpose-built AI model trained on Lilly’s proprietary datasets for accelerated biologics design. This custom model integration follows Lilly’s evaluation of Chai-2, a zero-shot antibody design platform that achieved double-digit experimental hit rates in early testing. The collaboration aims to shorten discovery timelines from months to weeks and builds on Chai’s recent $1.3 billion valuation achieved in its Series B round, reinforcing Lilly’s strategy to leverage frontier AI capabilities across its R&D portfolio.

4. Phase 3b TOGETHER-PsA Trial Shows Dual-Therapy Benefits

In a late-stage study, combining Lilly’s Zepbound (tirzepatide) with its psoriatic arthritis treatment Taltz (ixekizumab) produced a 31.7% ACR50 response rate versus 0.8% for Taltz monotherapy, representing a 64% relative improvement. Patients also experienced clinically meaningful weight loss, enhancing the dual regimen’s appeal for those with comorbid obesity. Adverse events remained mild to moderate and consistent with each drug’s established safety profile, positioning the combination as a potential new standard for overweight patients suffering from psoriatic arthritis.

Sources

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