Definition of ploidy ranges from unaffacted colon mucosa specimens and estimation of ploidy in tumor samples.

a% denotes the percentage of specimens in category relative to the total number of specimens (151). bCEN-20 aneusomy was defined as specimens with CEN-20 signals in a higher ploidy range than CEN-2. CEN-2 aneusomy was similarly defined, although vice versa.a% 表示某类别样本数占总样本量（共计151份）的百分比。bCEN-20型非整倍体（aneusomy）定义为：样本中20号染色体着丝粒（CEN-20）信号的倍性范围高于2号染色体着丝粒（CEN-2）。2号染色体着丝粒（CEN-2）非整倍体的定义与之类似，但判定逻辑恰好相反。