Objective: To investigate the
natural outcome of genital tract high risk human papillomavirus (HR-HPV)
infection and associated factors among women in Xi'an region.
Methods: Totally 760 women
with primary genital tract HR-HPV infection were enrolled and followed up by
HPV-DNA genotyping technology. The cervical cytological techniques and/or
colposcopy were used when necessary.
Results: Among these
subjects, the natural clearance rate of HR-HPV infection was 71.58%, with the
median time of 8.10 months. The rate of HPV persistent infection was 22.63%, with
the median time of 17.23 months. The rate of progression to cervical
intraepithelial neoplasia (CIN)/cervical cancer (CC) was 5.79%, with the median
time of 29.34 months. The natural clearance rate (P=0.000), persistent
infection rate (P=0.000) and progression rate (P=0.040) in women older than 50
years were statistically difference from other age groups. The persistent
infection rate in multiple infections group was significantly lower than that
in single infection group (P=0.010), with the median time statistically longer
than that in single infection group (P=0.018). The most easily progressive
genotypes were HPV-16, HPV-33, HPV-58,HPV-18,HPV-52,and HPV-68,among which
HPV-16 was the most common genotype in CIN 3/CC cases, accounting for 85.00%.
Conclusions: Most of HR-HPV
infections are naturally cleared within 2 years, and only a few cases
progresses to CIN/CC. Women older than 50 years have a lower natural clearance
rate and higher persistent and progressive rates. Multiple infections can
affect the persistent infection. HPV-16 is the most common carcinogenic
genotype in Xi'an region.
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- 1Department of Obstetrics and Gynecology,the First Affiliated Hospital of Xi'anJiaotong University,Xi'an 710061,China.
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