Reduction in Human Papillomavirus Vaccine Type Prevalence Among Young Women Screened for Cervical Cancer in an Integrated US Healthcare Delivery System in 2007 and 2012-2013.

BACKGROUND: In the United States, human papillomavirus (HPV) vaccine is recommended for 11- or 12-year-olds, and for young adults not previously vaccinated. Early vaccine impact can be measured by reductions in vaccine-type (VT) HPV prevalence. METHODS: Consecutive residual cervical specimens were retained from women aged 20-29 years at Kaiser Permanente Northwest in 2007, 2012, and 2013. HPV genotypes were determined using L1 consensus polymerase chain reaction with type-specific hybridization to detect 37 types, including VT HPV (HPV type 6, 11, 16, and 18). We compared HPV prevalence in 2007 and 2012-2013, and we evaluated predictors of VT HPV and any-HPV prevalence in 2012-2013. RESULTS: In 2012-2013, 31.9% of 4181 women had initiated HPV vaccination. VT HPV prevalence decreased from 10.6% in 2007 to 6.2% in 2012-2013 (P < .001). In 2012-2013, VT HPV prevalence was significantly lower among those who initiated vaccination <19 years (adjusted prevalence ratio, 0.1; 95% confidence interval, .1-.3) than among those who were not vaccinated, and higher among those who had chlamydia, human immunodeficiency virus, or pregnancy testing in the past year than among those who did not (adjusted prevalence ratio, 1.4; 95% confidence interval, 1.1-1.8). CONCLUSIONS: Reduction in VT HPV was found in young women in an integrated healthcare delivery system within 6 years of vaccine introduction, indicating early HPV vaccine impact.

Incidence of genital warts in adolescents and young adults in an integrated health care delivery system in the United States before human papillomavirus vaccine recommendations.

BACKGROUND: Information on genital wart incidence in adolescents and young adults before human papillomavirus (HPV) vaccination is important for understanding the impact of the vaccine on the epidemiology of this early outcome of HPV infection. METHODS: The study population included 11- to 29-year-old enrollees of Northern California Kaiser Permanente between July 1, 2000, and July 1, 2005, before the availability of the HPV vaccine. We identified genital warts with an algorithm combining genital wart-specific International Classification of Diseases, Ninth Revision, Clinical Modification codes (078.10, 078.11, and 078.19) with physician-recorded anatomic locations. We calculated sex- and age-specific incidence rates of genital warts and described the specific anatomic location of presentation, as well as recurrences of genital warts. RESULTS: We identified 1,682 cases of genital warts among 181,264 individuals. The incidence rate was highest among women (6.3/1000 person-years) and men (2.9/1000 person-years) aged 20 to 24 years old. Among women (n = 96,792), 63.4% of the 1240 incident genital wart cases occurred on the vulva and 21.1% on the cervix. Among men (n = 84,472), 91.6% of the 442 incident genital wart cases did not have a specific anatomic location recorded. Most people with an incident genital wart diagnosis (87.2%) did not have a recurrence during the observation period. CONCLUSIONS: Our study found that the incidence of genital warts was highest among persons aged 20 to 24 years using a unique method to identify the location of the wart. Information on incidence of genital warts before vaccine use provides baseline data that can be used to measure HPV vaccine impact.

Cervical intraepithelial neoplasia grade 3 and adenocarcinoma in situ: comparison of ICD-9 codes and pathology results--Kaiser Permanente, United States, 2000-2005.

BACKGROUND: Cervical intraepithelial neoplasia grade 3+ (CIN3+) and adenocarcinoma in situ incidence will be an important measure of HPV vaccine impact. Integrated healthcare delivery systems, such as Kaiser Permanente, could be used to monitor CIN3+ trends; however, limited evaluations of data from healthcare delivery systems for CIN3+ surveillance exist. METHODS: We compared CIN3+ diagnoses by ICD-9 code with CIN3+ diagnoses by pathology results among 121,211 females aged 11 to 30 years who were continuously enrolled from 2000 to 2005 in either Kaiser Permanente Northern California or Kaiser Permanente Northwest. We calculated sensitivity and positive predictive value of diagnosis by ICD-9 codes using pathology CIN3+ diagnosis as the gold standard. RESULTS: There were 1,090 women with at least one CIN3+ diagnosis by ICD-9 code 233.1 and 1,200 women with at least one CIN3+ diagnosis by pathology results. The sensitivity of the ICD-9 code for detecting a woman with at least one pathology diagnosis for CIN3+ was 62% (740/1,200); positive predictive value was 68% (740/1,090). Among women with at least one CIN3+ diagnosis by ICD-9 code, 679 (62%) had more than one visit with this code; whereas, among women with at least one CIN3+ diagnosis by pathology, 466 (39%) had more than one CIN3+ pathology result. CONCLUSIONS: ICD-9 codes may underestimate the number of women with at least one CIN3+ diagnosis. IMPACT: Pathology results, when available, may provide better estimates of CIN3+ incidence.

Prevalence of HPV types in cervical specimens from an integrated healthcare delivery system: baseline assessment to measure HPV vaccine impact.

PURPOSE: Two human papillomavirus (HPV) vaccines are available to prevent cervical cancer. One early measure of HPV vaccine impact would be a reduction in vaccine-related HPV types (HPV 6, 11, 16, or 18, or HPV 16, 18) in cervical samples from young women. We aimed to assess feasibility of specimen collection and baseline HPV prevalence in an integrated healthcare delivery system. METHODS: Residual cervical specimens collected during routine cervical cancer screening (2006-2008) were retained consecutively from eligible females aged 11-29 years, stratified by age group. Specimens were evaluated for 37 HPV genotypes using the Roche Linear Array assay. RESULTS: Of 10,124 specimens submitted, 10,103 (99 %) were adequate for HPV testing. Prevalence of HPV 6, 11, 16, or 18 genotype was 11.4 % overall and was the highest in the youngest age group (18.1 % in the 11-19-year-olds, 12.5 % in the 20-24-year-olds, and 7.0 % in the 25-29-year-olds). CONCLUSIONS: HPV types 6, 11, 16, or 18 prevalence could be measured over time to assess early HPV vaccine impact using residual specimens from an integrated healthcare delivery system, particularly if sampling focused on young women.

Updates on human papillomavirus and genital warts and counseling messages from the 2010 Sexually Transmitted Diseases Treatment Guidelines.

BACKGROUND: In April 2009, experts on sexually transmitted diseases (STDs) were convened to review updates on STD prevention and treatment in preparation for the revision of the Centers for Disease Control and Prevention (CDC) STD Treatment Guidelines. At this meeting, there was a discussion of important updates on human papillomavirus (HPV), genital warts, and cervical cancer screening. METHODS: Key questions were identified with assistance from an expert panel, and systematic reviews of the literature were conducted searching the English-language literature of the PubMed computerized database (US National Library of Medicine). The available evidence was reviewed, and new information was incorporated in the 2010 CDC STD Treatment Guidelines. RESULTS: Two HPV vaccines are now available, the quadrivalent HPV vaccine and the bivalent HPV vaccine; either vaccine is recommended routinely for girls aged 11 or 12 years. The quadrivalent HPV vaccine may be given to boys and men aged 9-26 years. A new patient-applied treatment option for genital warts, sinecatechins 15% ointment, is available and recommended for treatment of external genital warts. This product is a mixture of active ingredients (catechins) from green tea. Finally, updated counseling guidelines and messages about HPV, genital warts, and cervical cancer are included. CONCLUSIONS: This manuscript highlights updates to the 2010 CDC STD Treatment Guidelines for HPV and genital warts. Important additions to the 2010 STD Treatment Guidelines include information on prophylactic HPV vaccine recommendations, new patient-applied treatment options for genital warts, and counseling messages for patients on HPV, genital warts, cervical cancer screening, and HPV tests.

Human papillomavirus vaccine coverage in the United States, National Health and Nutrition Examination Survey, 2007-2008.

OBJECTIVES: This study aims to estimate human papillomavirus (HPV) vaccine coverage by demographic and sexual behavior characteristics 1-2 years after vaccine licensure in a nationally representative sample of females aged 9-59 years in the United States. METHODS: In 2007-2008, a total of 2775 females aged 9-59 years responded to questions on HPV vaccine receipt in the National Health and Nutrition Examination Survey (NHANES). Demographic and sexual characteristics were evaluated for select age categories in bivariate analyses after adjusting for survey design. RESULTS: Overall, 15.2% of females aged 11-26 years reported HPV vaccine initiation; vaccine initiation varied significantly by age. We found no significant difference in vaccine initiation by race or poverty level in either 11-18 or 19-26-year olds. Significantly more 19-26-year olds with private insurance initiated vaccine (16.3%) than those with public insurance (4.0%) (p = 0.04). Among females aged 14-18 years, vaccine initiation was higher in those who ever had sex (28.6%) compared to those who had never had sex (17.8%) (p = 0.05). CONCLUSIONS: These results describe HPV vaccine initiation shortly after vaccine licensure. Vaccine initiation was highest in females aged 14-18 years. Efforts should be made to increase HPV vaccine coverage for the recommended age groups.