AQP3 and Bowen disease of the skin: Positive AQP3 staining was seen in 26 Bowen's diseases (Figure 4(b)) (2 focal, 24 diffuse), 43 squamous cell carcinomas (Figure 4(d)) (3 focal, 7 intermediate, and 33 diffuse), and 19 apocrine carcinomas (Figure 4(e)) (3 intermediate, 16 diffuse).