Table 1

Expression of p21waf1/cip1 in 20 inverted papillomas

Basal/parabasal cellsMedian cell layerSurface cells
p21 negativep21 positivep21 negativep21 positivep21 negativep21 positive
Columnar epithelium was present in 11 cases, transitional epithelium in 20 cases, and squamous differentiation in 16 specimens.
Columnar epithelium
p53 negative505014
p53 positive336006
Transitional epithelium
p53 negative707070
p53 positive3911157
Squamous epithelium
p53 negative505050
p53 positive2911074