Immunostaining showed that two to three layers of PCNA-positive cells were present in the peripheral area of the tumor nests of VC, but with a diffuse disseminated distribution in the tumor nests of SCCs.

• 增殖细胞核抗原阳性细胞在疣状癌呈连续性分布于肿瘤巢外侧2~层细胞，而鳞状细胞癌则呈现广泛性散在分布。