Biostar Pharma, Inc., the US subsidiary of Beijing Biostar Pharmaceuticals Co., Ltd. ("Biostar", Stock Code: 2563.HK) which is a synthetic biology driven biopharma company focusing on the discovery, development and commercialization of innovative oncology drugs, is pleased to announce that the first patients have been dosed for two phase II/III multiregional clinical trials (MRCT) of "Utidelone Capsule (UTD2) first-line treatment for locally advanced or metastatic gastric or gastroesophageal junction adenocarcinoma" (NCT06841679) and "UTD2 treatment for platinum-resistant advanced epithelial ovarian, fallopian tube, or primary peritoneal cancer" (NCT07044349) on September 11, 2025 and September 12, 2025, respectively.

Utidelone has demonstrated excellent clinical data in gastric cancer: in a completed Phase II study of Utidelone Injection (UTD1) combined with PD-1 inhibitor and oxaliplatin for the first-line treatment of unresectable locally advanced or recurrent/metastatic HER2-negative gastric cancer, 23 patients had completed efficacy evaluation. Among them, 15 achieved partial response (PR) and 8 achieved stable disease (SD), resulting in a 65.2% objective response rate (ORR) and 100% clinical benefit rate (CBR). The median progression-free survival (mPFS) was 6.1 months. The combination regimen was generally well-tolerated. Most treatment-related adverse events (TRAEs) were Grade 1-2, reversible, and manageable. The longest treatment duration received by a patient was 22 cycles ^[1]. Consequently, Utidelone was granted an Orphan Drug Designation by the U.S. FDA for the treatment of advanced gastric cancer.

Besides gastric cancer, Utidelone has also shown considerable potential for treating ovarian cancer in previous clinical studies. A US Phase I clinical study of UTD2 as a monotherapy for advanced solid tumors had 12 evaluable patients, including one ovarian cancer patient with a complete response (CR) and another with PR, who had previously undergone 7 and 9 lines of therapy, respectively ^[2]. A Phase II clinical study of UTD1 as monotherapy for the treatment of advanced solid tumors had 10 evaluable patients in advanced ovarian cancer cohort, among them there were 1 PR and 3 SD.

Compared to taxanes, which are difficult for oral formulation development, Utidelone is not susceptible to P-glycoprotein thus cannot be pumped out of the cancer cell by P-glycoprotein and has the advantage for higher oral bioavailability and lower risk of developing cross-resistance. By utilizing its technology platform, Biostar developed Utidelone Capsule, and its efficacy and safety have been confirmed in both US and China's studies. Utidelone Capsule will significantly improve the convenience of administration, compliance of patients, decrease in treatment cost and ease of combination therapy with other oral anti-cancer drugs, and more suitable for adjuvant or maintenance therapy. Beyond gastric and ovarian cancers, Biostar is actively planning and advancing multiple clinical studies to expand UTD2's indications, including breast cancer adjuvant intensification therapy, pancreatic cancer, esophageal cancer, colorectal cancer, and so on.