CDKN2A and squamous papilloma: In another series, positive HPV DNA was reported by investigators in 5 (71%) of 7 squamous papillomas[13] ; as well as by other authors, in squamous papillomas with[11, 14] and without koilocytosis.[15] The diagnostic utility of HPV studies and surrogate biomarkers like p16 in STBP has not been well documented.