Pap Smear (cont.)
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What is the follow-up after treatment for an abnormal Pap smear?
Follow-up is crucial after treatment for an abnormal Pap test. Women who have undergone any one of the above-described
treatment procedures require special follow-up schedules. They must be evaluated
and checked until the physician is fully convinced that routine Pap smears can
be resumed.
What is the current status of human papilloma virus (HPV) typing?
HPV is a
sexually transmitted virus that may be spread from one person to another even when the genital sores are not visible. Many sexually active people are carriers of HPV, very often without even knowing they are carriers. It is estimated that up to 60% of sexually active women harbor this virus on their cervix or in their vaginal area. It is not unusual for a woman to be unaware that she has HPV - only to find out that her Pap smear shows evidence of HPV.
HPV is not curable, although the cellular damage it causes is generally treatable and a vaccine against the four most commonly found HPV types is available. A woman with HPV needs careful and regular long-term medical follow-up to watch for any resulting HPV-associated pre-cancerous cellular changes.
There are over 70 different strains of HPV virus. Based
on the observation that certain strains of HPV (for example, types 16 and 18)
are more likely to be associated with cervical cancer, some people have
advocated testing HPV infected women in order to identify their specific strain
of HPV. Following an abnormal Pap smear, this information would then be used to help select the specific treatment strategy. In other words, a physician would more aggressively treat a woman with an abnormal Pap smear if she tests positive for an HPV type that is more likely to be associated with the development of cervical cancer.
However, even the so-called "low-risk" HPV strains can
still be associated with
cervical cancer at some time in the future and not all
of the high-risk HPV strain abnormalities will necessarily result in cervical
cancer. Furthermore, the HPV typing is expensive.
The main use of HPV testing in screening for
cervical cancer is for determination of treatment and follow-up recommendations
for women with Pap smears interpreted as atypical squamous cells of undetermined
significance (ASC-US) . Those with positive tests for high risk HPV types and an
ASC-US smear are referred for further evaluation.
HPV testing along with Pap screening (a combined test) was approved for primary screening for cervical cancer by the U.S. Food and Drug Administration (FDA) in 2003. This combined testing has been used as an alternative screening test for low risk women aged 30 and over at intervals of three years or greater.
Next: When should women start and stop having Pap smears, and how often should Pap smears be performed? »
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