It is human papillomavirus (HPV), a kind of virus, that leads to CA.This kind of virus live autoeciously in the nucleolus of basal cells, while a few of them in the outside of the cells.

• 尖锐湿疣的病因是人类乳头瘤病毒(HPV)，它感染人体后寄居于基底细胞等角质形成细胞的核内，部分位于核外，而位于核内的HPV可长期潜伏存在，是CA复发的根源所在。