Publications by authors named "Robert G Pretorius"

Objective: The aim of the study was to determine which women require loop electrosurgical excision procedure (LEEP) or cervical conization (cone) to exclude cervical cancer after colposcopy for evaluation of abnormal cervical cancer screening tests yet before simple hysterectomy.

Materials And Methods: Review of electronic medical records from colposcopy clinics followed by chart review of women with cervical cancer was conducted.

Results: Of 18,537 cervical colposcopies for evaluation of abnormal cervical cancer screening tests, 0.

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Objective: The aim of the study was to assess whether lower proportions of cervical intraepithelial neoplasia 2+ diagnosed by random biopsy are from lower cut points defining an abnormal colposcopic impression or obtaining only one random biopsy when colposcopic impression is normal.

Methods: We compared colposcopy experiences within Shanxi Province Cervical Cancer Screening Study (SPOCCS) (n = 1,383) and Shenzhen Cervical Cancer Screening Trial (SHENCCAST) (n = 631), which had instructive differences in the cut point defining an abnormal colposcopic impression.

Results: The proportion of CIN 2+ diagnosed by random biopsy in SPOCCS (35.

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Objective: The aim of the study was to evaluate the human papillomavirus (HPV) viral load combined with cytology as a secondary screening strategy after primary HPV screening.

Materials And Methods: The data referring to direct Hybrid Capture 2 (HC2), cytology, and histology from Shenzhen Cervical Cancer Screening Trial II were re-analyzed to determine the correlation between viral load and cervical lesions. In addition, algorithms using different viral loads as cut points for immediate colposcopy plus cytology triage were compared with several recommended or controversial primary screening methods.

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Objective: The aim of the study was to determine whether p16 positive/cervical intraepithelial neoplasia (CIN) 2, 3, and cancer (p16 + CIN 2/3+) detected by colposcopy-directed or random biopsy differ by age, referral cytology, human papillomavirus (HPV) 16, and lesion size.

Materials And Methods: Data from the Shenzhen Cervical Cancer Screening Trial II where, at colposcopy, women who had directed and random cervical biopsies were reviewed to find women with CIN 2, 3, or cancer; 227 such women identified had their paraffin-embedded tissue blocks recut, reviewed, and then immune stained for p16. Data were analyzed by χ, Fisher exact test, and linear regression.

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Objective: The aim of this study was to determine if there is a different p16 expression pattern between colposcope-directed and random (colposcope-undetectable) biopsies of cervical intraepithelial neoplasia (CIN2) and CIN3.

Methods: Cervical biopsies that were positive for CIN2 or CIN3 were selected from a database of samples acquired during a large population-based clinical trial in Guangdong Province in China (Shenzhen Cervical Cancer Screening Study II). Blocks were recut, reread, and then immunostained for p16.

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Objectives: Although endocervical curettage (ECC) is often performed at colposcopy, it remains unclear whether it should be done in all women, only women over a certain age, only women with unsatisfactory colposcopy, or only in women with normal colposcopic impressions. To clarify the indications for ECC, we determined the proportion of colposcopies with CIN 3, or cancer (CIN 3+) detected only by ECC showing CIN 2, CIN 3, or cancer (CIN 2+).

Methods: Review of electronic medical records from colposcopy clinics.

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Objectives: The objective of this work was to determine the risk of invasive cervical cancer at colposcopy based on the woman's age, associated cervical cytology, and colposcopic impression.

Methods: Review of electronic medical records from colposcopy clinics followed by chart review of women with cervical cancer.

Results: Between March 1, 1996, and April 23, 2013, 27,381 cervical colposcopies for evaluation of abnormal cervical cytology and/or positive high-risk human papillomavirus tests were performed.

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Objectives: We hypothesized that women with cervical cytologic results of high-grade squamous intraepithelial lesion (HSIL) and negative high-risk human papillomavirus (HR-HPV) test results would have a high risk of having endometrial cancer and would benefit from routine endometrial biopsy.

Materials And Methods: Reports of women with cytologic results of HSIL and negative HR-HPV test results were found in an electronic colposcopy database; their charts were reviewed. Rates of endometrial cancer for cytologic results of HSIL and negative HR-HPV test results were compared to a historical series for cytologic results of HSIL with positive HR-HPV and cytologic results of atypical glandular cells (AGCs) and negative HR-HPV test results.

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Objectives: To determine a management strategy for women testing negative with cervical cytology and positive for high-risk human papillomavirus (HR-HPV).

Methods: Using the data from the large population-based Shenzhen Cervical Cancer Screening Trials II and III (SHENCCAST II/III), we compared the risk for cervical intraepithelial neoplasia grade 3 or cancer (CIN 3+) in women with negative cytology but testing positive for HR-HPV DNA using Cervista HPV HR or matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF), followed by secondary screening with type-specific Cervista HPV-16/18 or MALDI-TOF. The study aim was to seek the most sensitive and specific triage assay for referral for colposcopy.

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Objective: In women with negative cervical cytology and positive high-risk human papillomavirus (HR-HPV) test results, we compared the risk of cervical intraepithelial neoplasia 3 (CIN 3) or cancer (CIN 3+) in women with previous abnormal cervical cytology, CIN, or HR-HPV with that in women without this history, and we determined their cumulative risk of CIN 3+.

Materials And Methods: We reviewed colposcopies for negative cytology and positive HR-HPV test results from 2007 to 2009 (colposcopy was done for previous abnormal cytology, HR-HPV, or CIN or if negative cytology and positive HR-HPV test results for 20-35 months). Women with negative cytology and positive HR-HPV test results in 2007 were reviewed to determine their cumulative risk of CIN 3+.

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Background: Human papillomavirus (HPV) seroprevalence data have not previously been reported for different geographical regions of China. This study investigated the cross-sectional seroprevalence of antibodies to HPV 6, 11, 16, and 18 virus-like particles in Chinese women.

Methods: Population-based samples of women were enrolled from 2006 to 2007 in 3 rural and 2 urban areas of China.

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Objective: We recently demonstrated that a self-collected sample tested with a high-throughput polymerase chain reaction-based high-risk human papillomavirus (HR-HPV) assay is equal in sensitivity to a physician-obtained direct endocervical sample. We now explore some secondary screening options to improve specificity.

Methods: The Shenzhen Cervical Cancer Screening Trial II is a multisite, population-based cross-sectional cervical cancer screening study conducted in Guangdong Province, China.

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Objective: The study aimed to determine the increase in the yield of cervical intraepithelial neoplasia 3 (CIN 3) or cancer (CIN 3+) from random cervical biopsy in quadrants without visible lesions and endocervical curettage (ECC) in a low-prevalence setting.

Materials And Methods: Random biopsy and ECC (unless pregnant) have been obtained in the colposcopy clinic of the Southern California Permanente Medical Group (SCPMG)-Fontana since 2004. We reviewed the colposcopy experience of SCPMG-Fontana for January 1, 2007, to December 31, 2009, to determine the method of diagnosis of CIN 3+.

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To optimize HPV vaccination implementation at the population-level in China, data are needed on age-specific HPV 16, 18, 6 and 11 prevalence. This cross-sectional, population-based study evaluated the age- and type-specific HPV 16, 18, 6 and 11 prevalence of DNA and serum antibodies among women in China. From July 2006 to April 2007, 17-54 year old women from three rural provinces (Xinjiang, Shanxi and Henan) and two cities (Beijing and Shanghai) provided cervical exfoliated cells for HPV DNA and liquid-based cervical cytology (SurePath).

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Self-collected vaginal specimens tested for high-risk human papillomavirus (HR-HPV) have been shown to be less sensitive for the detection of cervical intraepithelial neoplasia or cancer (≥CIN 3) than physician-collected endocervical specimens. To increase the sensitivity of self-collected specimens, we studied a self-sampling device designed to obtain a larger specimen from the upper vagina (POI/NIH self-sampler) and a more sensitive polymerase chain reaction (PCR)-based HR-HPV assay. Women (10,000) were screened with cervical cytology and HR-HPV testing of vaginal self-collected and endocervical physician-collected specimens.

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Our objective was to directly compare the accuracy of the high-risk human papillomavirus (HPV) assays, Hybrid Capture 2 (hc2; Qiagen, Gaithersburg, MD) and Cervista (Hologic, Bedford, MA), in diagnosing cervical intraepithelial neoplasia (CIN) 3 or worse (cancer). A population-based, cross-sectional study (The Shenzhen Cervical Cancer Screening Trial II) was conducted in Guangdong Province in China. Three high-risk HPV assays, self and direct cervical sampling and cytology, were studied.

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Objectives: The objectives of this study were to compare the sensitivity of colposcopically directed biopsy (biopsy of cervical quadrants with colposcopic impressions of human papillomavirus, cervical intraepithelial neoplasia [CIN], or cancer) for CIN 3 or cancer (CIN 3+) among physicians and to estimate the increase in yield of CIN 3+ per colposcopy associated with "random" biopsies and/or endocervical curettage (ECC).

Methods: Two studies in which 7 physicians performed 1,383 colposcopic examinations on women with abnormal cervical cytology were reviewed. At colposcopy, the cervix was divided into quadrants by lines from the 12- to the 6-o'clock and from the 3- to the 9-o'clock positions.

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To determine why a vaginal self-collection tested for high-risk human papillomavirus (HR-HPV) by Hybrid Capture 2(R) (hc2) has lower sensitivity and specificity for cervical intraepithelial neoplasia Grade 2 or worse (> or = CIN 2), we collected 5 specimens (endocervix, upper and lower vagina, perineum, vaginal self-collection) from 2,625 women. Endocervical and self-collected specimens had HR-HPV tests by hc2. All 5 anogenital specimens were tested for 37 HPV genotypes [Linear Array(R), (LA)] from 397 women hc2 positive in endocervical or self-collected specimens and for a randomly selected 71 of 2,228 women hc2 negative on both specimens.

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Long-term follow-up evaluations of cervical screening approaches are limited in low-resource areas. This prospective study assessed the risk of future cervical intraepithelial neoplasia grade 2 or worse (CIN2+) associated with baseline human papillomavirus (HPV) and cytologic status. In rural China, 1,997 women were screened with 6 screening tests, including colposcopic evaluations, and underwent biopsies in 1999.

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The Mexican Cervical Cancer Screening (MECCS) study took place in the State of Michoacán. Primary screening was by self-sampling for high-risk human papillomavirus (HR-HPV). The objectives were to increase the specificity of primary HPV screening by requiring 2 positive HPV tests 1 year apart in women whose secondary screen was negative according to an acetic acid-aided visual inspection (VIA).

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