Cervical cancer is divided into four clinical stages, including one stage, two stages, three stages and four stages. Phase I is also divided into Phase 1a and Phase 1b. Phase 1a means that the depth of invasion of cancer focus under the microscope is less than 5mm, and Phase 1b means that the cancer focus is limited to the cervix and the depth of invasion is greater than or equal to 5mm; Stage II is divided into stage 2a and stage IIB. Stage IIa refers to the cancer involving 2/3 of the vagina without parauterine infiltration, and stage IIb refers to parauterine infiltration without reaching the pelvic wall; Stage III refers to the cancer involving the lower 1/3 of the vagina, or spreading to the pelvic wall or causing hydronephrosis, or nonfunctional kidney, or involving the pelvic cavity, abdominal aortic lymph nodes; Stage IV refers to the cancer has spread beyond the true pelvis, or has involved the bladder, rectal mucosa, etc.
