MGMT and MLH1 promoter methylation versus APC, KRAS and BRAF gene mutations in colorectal cancer: indications for distinct pathways and sequence of events

S de Vogel, M. P Weijenberg, J. G Herman, K. A. D Wouters, A. F. P. M de Goeij, P. A van den Brandt, A. P de Bruine and M. van Engeland

Annals of Oncology 20 ( 7 ): 1216 - 1222 , 2009