In GC models, known FGFR driver mutations were associated with partial responses (best dT/C=0.42), however models carrying FGFR2-fusions (4/6 with FGFR fusions) were highly responsive leading to strong regressions….DZB had strong activity in PDX-models with FGFR-fusions and high FGFR expression, in particular in GC, where regressions were observed in all FGFR2 fusion models...