In the experimental and control groups , DFS was similar in the intention-to-treat population ( hazard ratio -LSB- HR -RSB- @ ; @ % CI @-@ ; p = @ ) , and in patients with KRAS exon @/BRAF wild-type ( n = @ , HR @ ; @ % CI @-@ ) or KRAS exon @-mutated tumours ( n = @ , HR @ ; @ % CI @-@ ) .