a<p>C, Caucasian; U, Unknown.</p>b<p>median or mean age.</p>c<p>S, Single centre; M, Multicentre.</p>d<p>SPR, Sizing of PCR products; PYRS, Pyrosequencing; Sequencing, other DNA sequencing methods.</p>e<p>IR(I), irinotecan; 5FU, 5-fluorouracil; CAPe, capecitabine; OX(A), oxaliplatin; LV, leucovorin; XEL, xeloda; TEGAF, uracil/tegafur/LV.</p>f<p>RECIST, Response Evaluation Criteria in Solid Tumors.</p>g<p>R, analysis was planned retrospectively; P, analysis was planned prospectively.</p>h<p>TR, therapeutic response; PFS, progression-free survival; OS, overall survival.</p>i<p>These data were not available.</p
