title: In which step does the K-ras mutation occur in colorectal carcinogenesis?
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Takayama
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Niitsu
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics*; D015179:Colorectal Neoplasms / Q000235:genetics*; D011905:Genes, ras / Q000235:genetics*; D018740:Genetic Heterogeneity; D006801:Humans; D017354:Point Mutation