>is it perfectly logical that Erbitux be second-line (to chemo I presume), or is this a consequence of the clinical trial process in that it is difficult to displace the SoC due to ethical concerns<
It’s a consequence of the clinical data available to date. There are yet no completed pivotal studies for Erbitux in first-line CRC, although a large trial run by Merck KGaA is underway: