For example, MUC5AC expression was found by Betge et al. in 66% of 107 right-sided cancers and in 47% of 107 left-sided cancers [17], Nishida et al. in 27% of 89 right-sided cancers and in 12% of 27 left-sided cancers [29], Imai et al. in 63% of 114 right-sided cancers and in 31% of 121 left-sided cancers [20], Walsh et al. in 60% of 220 right-sided cancers and in 43% of 417 left-sided cancers [34], Park et al. in 53% of 76 right-sided cancers and in 17% of 118 left-sided cancers [30], and Biemer-Hüttmann et al. in 55% of 40 proximal and in 22% of 23 rectal cancers [18]. This evidence concerns the gene MUC5AC and rectal cancer.