Fig. 4From: Pulmonary papillary adenoma with malignant potential: a case report and literature reviewImmunohistochemical staining of the tumor. A, B, C, The tumor cells were diffusely positive for NapsinA, TTF-1, and CK7 (40×). D, Ki-67 proliferative index was about 6%, and even close to 20% in hot spots (100×)Back to article page