Cancer starts when cells in the body begin to grow out of control. Cells in nearly any part of the body can become cancer, and can spread to other areas of the body. To learn more about how cancers start and spread, see What Is Cancer?
Vaginal Cancer starts in the vagina. There are many different types of vaginal cancer, but the most common is called squamous cell carcinoma. It starts in the lining of the vagina.
The vagina starts at the cervix (the lower part of the uterus) and opens at the vulva (the external female genitals). The vagina is usually collapsed with its walls touching each other. The vaginal walls have many folds that help the vagina open and expand during sex or the birth of a baby.
Several different types of cells and tissues are found in the vagina:
Female reproductive organs
A pre-cancer is a condition where some cells look abnormal. These cell changes are not cancer, but could become cancer over time. Vaginal intraepithelial neoplasia or VAIN means that the changed cells are only found in the innermost surface layer of the vagina.
VAIN is more common in women who have had their uterus removed (hysterectomy) and in those who were treated for cervical cancer or pre-cancer in the past.
There are 3 types of VAIN: VAIN1, VAIN2, and VAIN3. VAIN3 is the closest to a true cancer. In the past, the term dysplasia was used instead of VAIN. The types of dysplasia were referred to as mild, moderate, and severe, based on how close it was to a true cancer. This term is used much less now.
Low-grade VAIN (VAIN1) will sometimes go away on its own, but VAIN can sometimes lead to cancer if not treated. Higher-grade VAIN (VAIN2 or VAIN3) is usually treated right away.
Though it's quite rare, there are many types of vaginal cancer. Each type forms from a different type of cell in the vagina.
Nearly 9 out of 10 cases of vaginal cancer are squamous cell carcinomas. These cancers start in the squamous cells that make up the epithelial lining of the vagina. They're most common in the upper part of the vagina near the cervix. If not treated, they can grow deeper into and, over time, through the vaginal wall and spread to nearby tissues. They can also spread to other parts of the body, most often the lungs, but also the liver and bones.
Squamous cell cancers of the vagina often develop slowly. First, some of the normal cells of the vagina get pre-cancerous changes (VAIN). Then some of the pre-cancer cells turn into cancer cells. This process can take many years.
Cancers that start in gland cells are called adenocarcinomas. About 1 out of 10 cases of vaginal cancer are adenocarcinomas.
The most common type of vaginal adenocarcinoma is found in women older than 50. Another type, called clear cell adenocarcinoma, is more common in young women who were exposed to diethylstilbestrol (DES) in utero (when they were in their mother’s womb). See Risk Factors for Vaginal Cancer for more information on DES and clear cell carcinoma.
Melanomas start in pigment-producing cells that give skin its color. These cancers usually are found on sun-exposed parts of the skin, but they can also form in the vagina or other internal organs. Fewer than 3 of every 100 cases of vaginal cancer are melanomas.
Melanoma tends to affect the lower or outer portion of the vagina. The tumors vary greatly in size, color, and growth pattern. More information on this can be found in Melanoma Skin Cancer.
Sarcomas are cancers that start in the cells of bones, muscles, or connective tissue. Fewer that 3 out of every 100 cases of vaginal cancer are sarcomas. These cancers form deep in the wall of the vagina, not on its surface.
There are several types of sarcomas. Rhabdomyosarcoma is the most common type of sarcoma that affects the vagina. It’s most often found in children and is rare in adults. A sarcoma called leiomyosarcoma is seen more often in adults. It tends to occur in women older than 50.
Cancers that start in the vagina are much less common than cancers that start in other organs (such as the cervix, uterus, rectum, or bladder) and then spread to the vagina. These cancers are named after the place where they started.
If a cancer involves both the cervix and vagina, it is considered a cervical cancer. Likewise, if the cancer involves both the vulva and the vagina, it’s considered a vulvar cancer.
The American Cancer Society medical and editorial content team
Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as journalists, editors, and translators with extensive experience in medical writing.
American Society of Clinical Oncology. Vaginal Cancer: Introduction. 08/2017. Accessed at www.cancer.net/cancer-types/vaginal-cancer/introduction on March 5, 2018.
Ishida H, Nagai T, Sato S, et al. Concomitant sentinel lymph node biopsy leading to abbreviated systematic lymphadenectomy in a patient with primary malignant melanoma of the vagina. Springerplus. 2015;4:102.
Marcos-Figueiredo P, Moreira DSDC, Morim MG, Pereira JL, Salgado LS. When an Unexpected Diagnosis Occurs: a Vaginal Premenopausal Sarcoma. Rev Bras Ginecol Obstet. 2018;40(1):47-52.
National Cancer Institute. Vaginal Cancer Treatment (PDQ®)–Health Professional Version. February 6, 2018. Accessed at www.cancer.gov/types/vaginal/hp/vaginal-treatment-pdq on March 5, 2018.
Saito T, Tabata T, Ikushima H, et al. Japan Society of Gynecologic Oncology guidelines 2015 for the treatment of vulvar cancer and vaginal cancer. Int J Clin Oncol. 2017 Nov 20.
Society of Gynecologic Oncology. What is Vaginal Cancer? Accessed at www.sgo.org/vaginal-cancer-general-information/ on March 5, 2018.
Last Revised: March 19, 2018
American Cancer Society medical information is copyrighted material. For reprint requests, please see our Content Usage Policy.