Increased expression of Psoriasin in human lung cancer. A, Expression of Psoriasin in squamous carcinoma (A1 to A3) and paired background tissues (A5-A7). Staining of Psoriasin in tumour cells is indicated by arrows. A4 and A8 are matched HE staining for the squamous carcinoma specimen and background tissue. A9 is the negative control of IHC using the secondary antibody alone. B, Psoriasin expression and overall survival of lung cancer.