Cervical cancer develops in the cells that line the cervix (lower area of the uterus). Different strains of the human papillomavirus (HPV), a sexually transmitted infection, can increase the risk of cervical cancer. There are three main types of this cancer:
Squamous: about 90% of cervical cancers that originate most often in the transformation zone.
Adenocarcinoma: make up most other cases, develop from grand cells.
Adenosquamous carcinomas or mixed carcinomas: the least common, a mix of the first two.