Jazz's Ziihera Shows Survival Benefit Over Trastuzumab in Phase 3 Trial

Earnings Impact 4
โดย Insider Monkey·US·Read original
Summary · why it matters

Jazz Pharmaceuticals reported that Ziihera plus chemotherapy produced a statistically significant and clinically meaningful overall-survival benefit over trastuzumab plus chemotherapy in the Phase 3 HERIZON-GEA-01 trial, with the hazard ratio improving from the first interim analysis. The global, open-label study randomized 914 patients across more than 30 countries, comparing Ziihera plus chemotherapy, Ziihera plus tislelizumab and chemotherapy, and trastuzumab plus chemotherapy as first-line treatments for HER2-positive unresectable locally advanced or metastatic gastroesophageal adenocarcinoma, with overall survival and progression-free survival as dual primary endpoints. The result strengthens the argument that Ziihera, a bispecific HER2-directed antibody, can displace trastuzumab as the HER2 backbone in this setting, though commercial implications depend on the size, durability, and consistency of the survival benefit. The FDA approved Ziihera plus chemotherapy for first-line treatment of HER2-positive IHC 3+ disease on August 25, 2026, and also approved Ziihera plus tislelizumab and chemotherapy for IHC 3+ or IHC 2+/ISH+ disease, providing an immediate commercial pathway. Jazz has not disclosed the updated median overall survival, hazard ratio, confidence interval, survival curves, or subgroup results, and safety concerns include boxed warnings for diarrhea and embryo-fetal toxicity, with diarrhea reported in 81% of 395 patients receiving Ziihera plus chemotherapy, including Grade 3 events in 20% and Grade 4 events in 1.3%. Hedge fund holdings in Jazz fell to 46 funds at the end of 2Q2026 from 48 funds three months earlier, according to Insider Monkey's database.

Impact on stocks 2

Biotech & Genomic Medicine · 1 stocks
Jazz Pharmaceuticals PLC
JAZZ
▲ PositiveTechnologyrelevance

Ziihera shows survival benefit over trastuzumab in Phase 3 trial, supporting its use as HER2 backbone.

Energy · 1 stocks

Theme Impact 1

Related news

2

Akeso Wins China Phase I Clearance for AK158D1 Bispecific ADC

Akeso has secured Phase I clinical trial clearance in China for AK158D1, a bispecific antibody drug conjugate targeting EGFR and TROP2 in advanced solid tumors. The clearance puts fresh attention on the company's pipeline as it pushes deeper into IO2.0 and ADC2.0. Akeso's shares recently traded at HK$90.5, up 3.37% over 90 days but down 20.12% year to date, against a consensus analyst price target of HK$158.28, with the most bullish target at HK$226.04 and the most bearish at HK$125.08. The company remains exposed to execution setbacks given its reliance on a handful of key drugs and a current net loss of CN¥967.2 million.
Simply Wall St·13hRead more →
2

Merck's KEYTRUDA Plus Padcev Wins CHMP Backing for EU Bladder Cancer

Merck received a positive opinion from the European Medicines Agency's CHMP for KEYTRUDA plus Padcev in muscle-invasive bladder cancer. The CHMP backed the combination as perioperative therapy for adults with resectable muscle-invasive bladder cancer in the European Union. If endorsed by the European Commission, the regimen would be the first PD-1 inhibitor plus antibody-drug conjugate option for this setting in Europe. The addressable group in Europe is relatively concentrated but clinically high need, with bladder cancer cases estimated at about 224,700 in 2022, roughly 25% of them classified as muscle invasive. The key near-term marker is the European Commission ruling expected by the fourth quarter of 2026, since the CHMP only issues recommendations.
Simply Wall St·15hRead more →
impact 4

FDA Grants Full Approval to Lilly's Inluriyo Plus Verzenio for ESR1-Mutated Breast Cancer

Eli Lilly and Company announced that the U.S. Food and Drug Administration has granted full approval to Inluriyo, or imlunestrant, in combination with Verzenio, or abemaciclib, for adults with ER-positive, HER2-negative, ESR1-mutated locally advanced or metastatic breast cancer whose disease progressed after at least one line of endocrine therapy. The decision rests on the Phase 3 EMBER-3 trial, in which the combination doubled median progression-free survival versus Inluriyo alone, at 11.1 months versus 5.5 months, with a hazard ratio of 0.53 and a 95% confidence interval of 0.35 to 0.80, among the 159 patients with ESR1-mutated metastatic breast cancer. In that trial, 92 patients received Inluriyo alone and 67 received the combination after an aromatase inhibitor, with or without a CDK4/6 inhibitor, in either the adjuvant or metastatic setting. The approval marks the second FDA clearance for Inluriyo in less than a year, following its September 2025 monotherapy approval for the same ER-positive, HER2-negative, ESR1-mutated metastatic population. Inluriyo is also being studied in the Phase 3 EMBER-4 trial in the adjuvant setting for ER-positive, HER2-negative early-stage breast cancer, the largest adjuvant oral SERD trial with more than 8,000 patients enrolled across 650-plus sites in more than 30 countries, with initial results anticipated in 2027. The combination is now available in the United States.
PR Newswire·20hRead more →