Figure 2. Necitumumab binds with high affinity to sEGFR harboring the cetuximab resistance mutations S468R.
A and B, SPR analysis of sEGFR, sEGFR-S468R and sEGFRd3-S468R binding to immobilized cetuximab (A) and necitumumab (B) Fabs. Normalized equilibrium SPR response plotted as a function of protein concentration were fit to a simple one-site Langmuir binding equation. Data are representative of at least three independent measurements. Mean KD values with standard deviations are reported in Supplementary Table S2.