2157 Comparison of KRAS and PIK3CA gene status between primary tumours and paired metastases in metastatic or recurrent colorectal cancer. (September 2015) - Ying, J.E.; He, Q.; Sun, W.Y.; Xu, Q.; Li, D.C.; Liu, B.X.; Du, Y.A.; Cao, W.M.; Chen, L.Y.; Wu, W.; Chen, L.; Luo, C.