No correlations were found between PTBE volume and age (r = −0.007, P = 0.956), sex (r = 0.165, P = 0.224), tumor volume (r = −0.167, P = 0.220), tumor location (r = 0.004, P = 0.976), tumor grade (r = 0.053, P = 0.696), or Ki-67 (r = 0.185, P = 0.337). This evidence concerns the gene MKI67 and neoplasm.