To explore the utility of FGX15-147 as an ADC payload, it was conjugated to trastuzumab in a stochastic manner (DAR 1.6) using a Maleimide-Valine-Alanine linker construct. The resulting ADC exhibited significant in vivo efficacy in a low copy number HER2+ pancreatic cancer Human Tumor Xenograft model using BALB-c mice transplanted with the CAPAN-1 cell line.