Cancer of the Cervix. The cervix is the lowest part of the uterus, that dilates during labor to let the baby out. Cancer in this part of the uterus almost always caused by infection with human papiloma virus, or hpv. This is the same virus that causes genital warts, but most warts don't lead to cancer. To prevent cervical cancer, you can get vaccinated when you are young, before you start having sex.