Basal cell hyperplasia and tumors have different features of morpholoy and immunohistochemistry in constract to that of secretory cells, and based on these fertures 6 types were categorized.

• 基底细胞增生和肿瘤具有与分泌细胞不同的形态学和免疫组化反应特征，其特征可表现为6型。