Does KRAS testing in metastatic colorectal cancer impact overall survival? A comparative effectiveness study in a population-based sample. oleh Heather Spencer Feigelson, Chan Zeng, Pamala A Pawloski, Adedayo A Onitilo, C Sue Richards, Monique A Johnson, Tia L Kauffman, Jennifer Webster, Carsie Nyirenda, Gwen L Alexander, Clara Hwang, Deanna Cross, Catherine A McCarty, Robert L Davis, Denise Schwarzkopf, Andrew E Williams, Stacey Honda, Yihe Daida, Lawrence H Kushi, Thomas Delate, Katrina A B Goddard, CERGEN Study Team