In expanding keratoacanthoma there was little expression of p27(kip) in nuclei of atypical keratinocytes composing the tumor (1.25 +/- 2.1 labeled cells per high-power field); in regressing keratoacanthoma the nuclei of most suprabasilar keratinocytes in atypical tumor aggregates contained p27(kip) (55.1 +/- 28.6 labeled cells per high-power field).
C0022572
keratoacanthoma