Preliminary safety, efficacy and pharmacokinetics (PK) results of KN026, a HER2 bispecific antibody in patients (pts) with HER2-positive metastatic breast cancer.

Abstract No : 1041

Abstract Type : Poster Session (Board #126)

Indication : Her2 Positive Breast Cancer

Intervention : KN026

Company : Alphamab (Australia) Co Pty Ltd.

Technology : Bispecific Antibody


As of the Jan, 22, 2020, 63 pts [median age: 54 years (31~69)] enrolled and 62 pts were included in the efficacy analysis. 41 pts remained on treatment and 22 pts discontinued treatment due to disease progression (n = 21) and adverse events (n = 1). The median treatment duration was 12 weeks (range: 4~62 weeks). Median prior lines of therapies are 3 (range: 1~15), and median prior lines of HER2 target therapies are 2 (range: 1~12). No DLTs were observed. Treatment-related AEs (TRAEs) occurred in 49 pts and 4 pts experienced 4 grade 3 TRAE (hypertension, infusion related reaction, transaminases increased and ventricular arrhythmia). The common ($ 10%) TRAE were pyrexia (23.8%), diarrhea (19.0%), aspartate aminotransferase increased (15.9%), neutrophil count decreased (11.1%) and white blood cell count decreased (11.1%). The objective response rate at recommended Phase 2 dose levels (n = 56) was 32.1% (95% CI 20.3, 46.0) and disease control rate 76.8% (95% CI 63.6, 87.0). Pharmacokinetic analysis showed exposure (Cmax and AUC0-t) of KN026 increased by dose. The recommended Phase 2 dose (RP2D) were 20 mg/kg Q2W and 30 mg/kg Q3W


KN026 is well tolerated and has demonstrated encouraging anti-tumor activity in HER2-positive breast cancer patients who have failed standard antiHER2 therapies. The recommended Phase 2 dose (RP2D) of KN026 were 20 mg/kg Q2W and 30 mg/kg Q3W. Phase II trials in various HER2-positive and HER2-low/intermediate solid tumors are currently ongoing.


KN026 is well tolerated and has a promising anti tumor activity in refractory patients. Further development can pave the way for first ever bispecific antibody for HER2+ breast cancer patients.

Refer to Her2 Positive Breast Cancer Market report for detailed Insights.