There are two main types of cervical cancer: squamous cell carcinoma and adenocarcinoma. These, as well as more rare types of cervical cancer, are classified according to how they look under a microscope.
Squamous cell carcinomas. About 85 percent to 90 percent of cervical cancers are squamous cell carcinomas. They begin in the ectocervix, the part of the cervix next to the vagina.
Adenocarcinomas. The remaining 10 percent to 15 percent of cervical cancers are adenocarcinomas, which develop from the mucus-producing gland cells of the endocervix, the part of the cervix next to the body.