LianBio announced the presentation of efficacy and safety data from a Phase 2a study evaluating infigratinib in Chinese patients with locally advanced or metastatic gastric cancer (GC) or gastroesophageal junction adenocarcinoma (GEJ) with fibroblast growth factor receptor-2 (FGFR2) gene amplification. The data were presented by Dr. Jiajia Yuan, Peking University Cancer Hospital and Institute, at the 2023 European Society for Medical Oncology (ESMO) Congress in a poster titled, ?Efficacy and Safety of Infigratinib in Patients with Locally Advanced or Metastatic Gastric Cancer or Gastroesophageal Junction Adenocarcinoma and FGFR2 Gene Amplification.? The study enrolled 21 GC and GEJ patients with FGFR2 gene amplification.

20 patients (95.2%) who had >1 post-baseline tumor assessment per RECIST v1.1 were evaluable. Confirmed objective response rate (cORR) was 23.8% (95% CI: 8.2 ? 47.2), disease control rate (DCR) was 76.2% (95% CI: 52.8 ?

91.8) and median duration of response (DOR) was 3.8 months (95% CI: 3.6 ? NE). Median progression-free survival (mPFS) was 3.3 months (95% CI: 2.3 ?

4.5) and median overall survival (mOS) was 8.0 months (95% CI: 4.1 ? NE). Among 20 evaluable patients who had post-baseline assessments, cORR was 25.0% (95% CI: 8.7?49.1) and DCR was 80.0% (95% CI: 56.3?94.3).

Infigratinib was generally well tolerated with a manageable safety profile. There were no treatment-related adverse events (TRAEs) leading to dose discontinuation, death, or drug-induced liver injury. FGFR pathway aberrations are common in multiple cancer types, including gastric cancer.

Infigratinib is an ATP-competitive, FGFR1-3 selective oral tyrosine kinase inhibitor. Infigratinib received Breakthrough Therapy Designation from the China National Medical Products Administration (NMPA) for the treatment of gastric cancer. The Phase 2 clinical trial is a multicenter, open-label, single-arm study in China designed to evaluate the safety and efficacy of infigratinib 125 mg QD in patients with locally advanced or metastatic gastric cancer or gastroesophageal junction adenocarcinoma with FGFR2 gene amplification (Cohort 1) and other advanced solid tumors with FGFR alterations (Cohort 2) who have received at least two prior lines of systemic therapy.

The primary endpoint is objective response rate (ORR). Secondary endpoints include duration of response, safety, disease control rate, progression-free survival, and overall survival (NCT05019794). Infigratinib is an orally administered, ATP-competitive, tyrosine kinase inhibitor of fibroblast growth factor receptor (FGFR) that targets the FGFR protein, blocking downstream activity.

In clinical studies, infigratinib demonstrated a clinically meaningful rate of tumor shrinkage (overall response rate) and duration of response in cholangiocarcinoma. It is currently being evaluated in clinical studies for locally advanced or metastatic gastric cancer or gastroesophageal junction adenocarcinoma, and other advanced solid tumors with FGFR genomic alterations. LianBio licensed rights from QED Therapeutics, a subsidiary of BridgeBio Pharma, for the development and commercialization of infigratinib for human prophylactic and therapeutic uses in all cancer indications in Mainland China, Hong Kong, and Macau.

Infigratinib was granted Breakthrough Therapy Designation in China for the treatment of patients with gastric cancer in 2023.