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ESMO Asia 2025: 🇨🇳Junshi Biosciences will present the first clinical trial data for its PD-1/VEGF bispecific antibody #JS207 in a poster session.
JS207 is currently in Ph2. Structurally, it differs significantly from other PD-1/VEGF bispecifics: its VEGF nanobody domain is embedded in the hinge region of the PD-1 antibody.
The study consists of Part A (dose escalation and expansion) and Part B (indication expansion).
- Part A enrolled patients refractory to standard therapy, using accelerated titration and Bayesian optimal interval design with JS207 administered intravenously every 3 weeks (Q3W) at doses ranging from 1 to 20 mg/kg.
- Part B evaluated JS207 at 10 and 15 mg/kg Q3W as first-line treatment in patients with PD-L1-positive (TPS ≥1%) advanced NSCLC, HCC, and RCC.
As of August 6, 2025:
- Part A: 23 patients enrolled
- Part B: 75 patients enrolled (32 PD-L1+ NSCLC at 10 mg/kg in Part A; 31 PD-L1+ NSCLC, 4 HCC, and 8 RCC at 15 mg/kg in Part B)
Median follow-up: 11.5 months (Part A), 6.5 months (Part B)
Results
- Part A: 1 urothelial carcinoma patient (10 mg/kg) and 1 MSI-H colorectal cancer patient (20 mg/kg) achieved durable partial responses (>17 months and >8 months, respectively).
- Part B: ORR and DCR in evaluable patients are shown in the below table.
10 mg/kg Q3W was selected as the recommended Ph2 dose — aligning with 3SBio' SSGJ-707 similar dosing strategy but lower than Akeso’s ivonescimab.
Safety Profile:
- No dose-limiting toxicities observed
- Most common TEAEs (≥25%): proteinuria, hypoalbuminemia, hypertension, and anemia.

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