Similar findings were observed for Ki-67 with high (mean, 39.9 months) and low levels of expression (mean, 37.6 months) in the adenocarcinoma group and high (mean, 49.7 months) and low levels of expression (mean, 23.6 months) in the squamous cell carcinoma group. This evidence concerns the gene MKI67 and squamous cell carcinoma.