The FDA announced today that, for the first time, it has approved a biosimilar for the treatment of cancer.
Overall response rate was 39% in the ABP-215 arm compared with 41.7% for EU-bevacizumab (risk ratio, 0.93; 90% CI, 0.8-1.09). There were 2 complete responses in each group, and 38.4% of the ABP-215 group had partial responses versus 41.1% in the bevacizumab group. Duration of response was 5.8 months for ABP-215 (95% CI, 4.9-7.7) compared with 5.6 months with bevacizumab (95% CI, 5.1-6.3).
Forty percent of patients in both groups experienced progression-free survival (PFS) events (HR, 1.03; 95% CI, 0.8-1.34). Median PFS was 6.6 months for ABP-215 (95% CI, 6.3-7.9) versus 7.0 months in the bevacizumab arm (95% CI, 6.6-8.2).
Trough serum concentrations (Ctrough) were collected on cycle 1 through cycle 4, and cycle 6 pre-dose to describe the PK of ABP-215 and EU-approved bevacizumab. The study was not intended to evaluate PK similarity between the 2 arms, but investigators observed comparable Ctrough and inter-subject variability.
Investigators said safety outcomes were similar to the known toxicity profile of US-approved bevacizumab, and there were no meaningful differences in adverse events (AEs), serious AEs, deaths up to 30 days after last treatment dose, or treatment discontinuations. Reported grade 3/4 AEs were 42% in the ABP-215 arm and 44% in the bevacizumab arm. No grade 3/4 AE exceeded a 2% incidence rate.
In a press release, the FDA reported that, as with bevacizumab, ABP-215’s label includes a boxed warning regarding an increased risk gastrointestinal perforations, surgery and wound healing complications, and severe or fatal pulmonary, gastrointestinal, central nervous system and vaginal hemorrhage.
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