21 Smith Smith G G Carey Carey FA FA Beattie Beattie J J Wilkie Wilkie MJ MJ Lightfoot Lightfoot TJ TJ Coxhead Coxhead J J Mutations in APC, Kirsten-ras, and p53--alternative genetic pathways to colorectal cancer Mutations in APC, Kirsten-ras, and p53--alternative genetic pathways to colorectal cancer Proc Natl Acad Sci USA Proc Natl Acad Sci USA 2002 2002 99 99 9433 9433 9438 9438 10.1073/pnas.122612899 10.1073/pnas.122612899 12093899 12093899. Here, TP53 is linked to colorectal cancer.