KRAS and pancreatic ductal adenocarcinoma: Although the Kirsten rat sarcoma viral oncogene homolog (KRAS) is mutated and activated in > 90% of pancreatic cancers, EGFR expression has also been shown to be essential for KRAS‐driven pancreatic ductal adenocarcinoma (Eser et al., 2014; Morris et al., 2010).