Around 1,408 new cervical cancer cases are diagnosed annually in Canada ((Koutsky L. 1997. Epidemiology of genital human papillomavirus infection. Regular cervical screening provides a high degree of protection against developing cervical cancer. Not receiving cervical screening is one of the biggest risk factors for developing cervical cancer.
Cervical screening is NOT a test to find cancer. It is a screening test to detect abnormalities (pre-cancer) at an early stage in the cells of the cervix.
Cervical screening is the process of taking a sample of cells from the cervix, which are then examined to detect abnormalities that could develop into cancer in the future. Screening can detect these precancerous/abnormal cells. The detection and successful treatment of these cells usually prevent the occurrence of cancer. Changes in these cells are generally caused by certain types of human papillomavirus (HPV). Testing for the HPV virus itself can also be done on the same sample that is examined under the microscope. For more information on HPV testing, see the HPV TESTING tab above.
Cervical Screening (Pap Test, also known as: Pap Smear)
Cervical screening is NOT a test to find cancer. It is a screening test to detect abnormalities (pre-cancer) at an early stage in the cells of the cervix.
Cervical screening test is the process of taking a sample of cells from your cervix, which are then examined to detect abnormalities that could develop into cancer in the future. The sample of cells is placed in a liquid so that it can be analysed in the laboratory. This process is called Liquid-Based Cytology (LBC). Screening can detect precancerous/abnormal cells. The detection and successful treatment of these cells usually prevent the occurrence of cancer. Changes in these cells are generally caused by certain types of human papillomavirus (HPV). Testing for the HPV virus itself can also be done on the same LBC sample that is examined under the microscope. To learn more, visit the cervical screening guidelines across provinces and territories in Canada.
Those with Compromised Immune Systems
If you have a cervix and a severely compromised immune system, such as HIV, you may need to be screened annually as you are more likely to develop a persistent infection of HPV which can cause cervical abnormalities over time. Being HIV positive increases the need to attend screening every year. The screening test is usually taken outside of the National Screening program. Check with your health care professional for further information on screening and vaccination.
Men and anyone with a penis and a severely compromised immune system are also at higher risk of contracting HPV. Therefore, check with your health care professional for further information on vaccination.
Not Eligible for Cervical Screening – Under 25
Cervical cancer is the 3rd most common female cancer for women aged between 14 and 44 years old in Canada.
Why does cervical screening start at 25?
HPV is very common in females under 25 years of age. Persistent infections after the age of 25 years are more likely to turn into an HPV-related cancers. Most cases of high-risk HPV will clear within 12 to 18 months and then the cervical abnormalities will return to normal. However, medical experts do not currently have a way to understand which abnormalities will clear on their own and which could turn into cancer. However, they do know that if you are older than 25 years old and the abnormal cells in your cervix have not cleared up on their own, there is a greater need to offer treatment.
So, if young women and those with a cervix are more likely to have abnormal cells, this means they will be more likely to be sent for treatment to remove the abnormal cells following a screening test.
Treatment for cervical abnormalities has been shown to increase the risk of preterm labour and cause unnecessary anxiety for the woman.((Bouvard et al., 2009. A review of human carcinogens – Part B: biological agents. Lancet Oncology 10, 321 – 32))((Winer RL et al., 2003. Genital human papillomavirus infection: incidence and risk factors in a cohort of female university students. American Journal of Epidemiology 157 (3), 218-226))((Dunleavey R (2009) Cervical Cancer: a guide for nurses. Wiley-Blackwell, UK. pp)).
Diagnosis and treatment for cervical abnormalities have been shown to cause significant psychological trauma and, considering the majority of abnormalities will clear without treatment, it means screening and subsequent treatment for abnormalities could cause more harm than the benefits of screening can provide.
Additionally, cervical screening has been shown not to be very effective in young women and those with a cervix. In countries where screening starts at 20 years old, rates of cervical cancer in those under the age of 25 years are not significantly different from countries in which screening starts at 25 years old ((Bruni L, Barrionuevo-Rosas L, Albero G, Aldea M, Serrano B, Valencia S, Brotons M, Mena M, Cosano R, Muñoz J, Bosch FX, de Sanjosé S, Castellsagué X. ICO Information Centre on HPV and Cancer (HPV Information Centre). Human Papillomavirus and Related Diseases in Canada. Summary Report 2014-12-18)).
The International Agency for Research on Cancer also recommends that cervical screening should not start before the age of 25.
Summary
- Cervical cancer is very rare if you are under 25 years old.
- Abnormal vaginal bleeding can be a symptom of cervical cancer – there are guidelines in place for the under 25s with abnormal bleeding. You should see your GP if you are bleeding outside of your period or after sex.
- Cervical screening (the Pap test) is not recommended for women under 25.