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Cervical Cancer Screening PowerPoint Presentation

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  • Slide 1 - Cervical Cancer Screening Recommendations, 2012 Herschel W. Lawson, MD, FACOG Chief Medical Officer, ASCCP
  • Slide 2 - Disclosures I have no relevant disclosures to make. I am active in the American Society for Colposcopy and Cervical Pathology and serve as Chief Medical Officer.
  • Slide 3 - Objectives of Screening Prevent morbidity and mortality from cervical cancer Prevent overzealous management of precursor lesions that most likely will regress or disappear and for which the risks of management outweigh the benefits
  • Slide 4 - Natural History of Cervical Cancer HPV infection CIN 1 CIN 2,3 HPV disappearance Invasive CA Avg. 10-13 yrs Avg. 6-24 mo Avg. 6-12 mo.
  • Slide 5 - The strengths and limitations of cervical cancer screening
  • Slide 6 - Widespread introduction of the Pap begins Conventional Pap smear Cervical Cancer Prevention 1949 2000’s
  • Slide 7 - Cervical Cancer Incidence (SEER) and U.S. Death Rates,* 1975-2005 Incidence source: SEER 9 areas (San Francisco, Connecticut, Detroit, Hawaii, Iowa, New Mexico, Seattle, Utah, and Atlanta). Mortality source: US Mortality Files, National Center for Health Statistics, CDC. *Rates are per 100,000 and are age-adjusted to the 2000 US Std Population (19 age groups - Census P25-1130).
  • Slide 8 - Being rarely or never screened is the major contributing factor to most cervical cancer deaths today.
  • Slide 9 - Who are the Rarely and Never Screened? Descriptions Minorities Low SES* Foreign born Living in the US < 10 years No usual source of health care Where are the data? US Census NCHS§ Cervical cancer mortality BRFSSµ NHIS** * Socio-economic status § National Center for Health Statistics, CDC µ Behavioral Risk Factor Surveillance System, CDC ** National Health Interview Survey, CDC
  • Slide 10 - System Failures Leading to Cervical Cancer Diagnosis Women do not come in for screening Health care providers do not screen women at visits Colposcopy for abnormal screen not done Patient does not get appropriate therapy Patient gets cervical cancer Courtesy of Connie Trimble, MD, Johns Hopkins University School of Medicine, Baltimore, MD
  • Slide 11 - Failure to screen No Pap 464 (56%) Failure in detection 1st Pap WNL 263 (32%) Failure to follow-up 1st Pap abnormal 106 (13%) Retrospective Study of Cervical Cancers Diagnosed at Kaiser Northern California Leyden MA, Manos M, Kinney W et al JNCI 2005;97:67583. Pap results 3-36 months prior to diagnosis No visit 19% 1-2 visits 18% >3 visits 63% N=833
  • Slide 12 - Proportion of Women Receiving Cervical Cancer Screening, NHIS*, United States, 2000 *National Health Interview Survey Swan J, Breen N, Coates RJ, Rimer BK, Lee NC. Progress in cancer screening practices in the United States: results from the 2000 National Health Interview Survey. Cancer. 2003;97:1528-40.
  • Slide 13 - Prevalence of Pap Tests during last 3 years, by education level, U.S. https://www.cdc.gov/nchs/data/hus/hus07.pdf 2007. Health US 2007.CDC, National Center for Health Statistics.
  • Slide 14 - Widespread introduction of the Pap begins Conventional Pap smear LBC 1949 1996 2000’s HPV testing Vaccine Cervical cancer prevention: Where have we been and where are we going? Markers
  • Slide 15 - Why isn’t “finding lesions” the objective of screening? Don’t know which lesions will progress. Need to place emphasis on: Persistent HPV infections CIN 3 (no margin for error) CIN 2 in older women (no risk to pregnancies) Persistent CIN 2 and CIN 2/3 in non-adolescent women
  • Slide 16 - Consensus Conference Sponsored by American Society of Colposcopy and Cervical Pathology (ASCCP) American Cancer Society (ACS) American Society of Clinical Pathology (ASCP)
  • Slide 17 - ACS/ASCCP/ASCP Guidelines Development Process 2009-2011 – A steering committee from the 3 organizations created 6 working groups and a data group to direct the evidence evaluation Participating organizations: AHRQ, AAFP, ABOG,ACHA, ACOG, ASHA, ASC, ASCT, CAP, CDC, CMS, FDA, NCI, NCCN, NPWH, PPFA, SCC, SGO, SGOC, AHRQ/USPSTF, VHA
  • Slide 18 - Guidelines Development Evidence Review Used “Grading Recommendations Assessment, Development, and Evaluation” system (GRADE) Articles retrieved 1995 to mid-2011 WGs reviewed and graded evidence “critical, important, nice to know” WGs developed recommendations --“strong” or “weak” depending on the quality of the evidence
  • Slide 19 - ACS/ASCCP/ASCP Guidelines Development Process 6 topic areas identified: Optimal screening intervals Screening women 30+ Managing discordant cytology/HPV results Exiting women from screening Impact of HPV vaccination on screening Potential for primary HPV testing (no Pap)
  • Slide 20 - Guidelines Development Process Assumptions Preventing all cervical cancer is unrealistic No screening test has 100% sensitivity Reasonable risk is determined by a strategy of performing cytology alone at 2-3y intervals Screening strategies with similar outcomes are acceptable Women at similar risk for cancer should be managed the same
  • Slide 21 - Guidelines Development Process Assumptions Conventional and liquid-based cytology perform similarly HPV tests should have ≥90% sensitivity for CIN2+ and CIN3+ Comparability of all FDA-approved HPV tests cannot be assumed Utility of unapproved/laboratory developed tests is unknown, and tests should not be used in screening
  • Slide 22 - Guidelines Development Process Assumptions Benefits of screening Cancer is the ideal endpoint but unrealistic CIN3 is a reliable surrogate marker for sensitivity CIN2 is equivocal (a combination of CIN1 and CIN3) hard to diagnose—poor inter-rater reliability often regresses a threshold for treatment
  • Slide 23 - Guidelines Development Process Assumptions Screening interval Risk of developing invasive cancer before next screen should be unlikely Earlier detection of CIN3+ is a benefit Even studies with less sensitive tests show similar CIN3 detection--no increased cancer risk during later screening rounds
  • Slide 24 - Guidelines Development Process Assumptions Possible harms of screening Anxiety over a positive test Stigma of an STI Pain/bleeding from procedures Treatment-related pregnancy complications Number of colposcopies is a marker for harms
  • Slide 25 - Treatment saves lives, but at what cost? Women with LEEP more likely to have Preterm birth (O.R. 1.7) LBW (O.R. 1.8) PPROM (O.R. 2.7) Single studies show association with perinatal death, incompetent cervix Risk rises with depth and number of LEEPs Similar findings after conization or laser treatment Absolute risk increase is small Kyrgiou M et al. Lancet 2006;367:489-98 Bruinsma et al BJOG 2007;114:70-80
  • Slide 26 - Guidelines Development Evidence Review Process Recommendations posted to ASCCP website for public comment 10/19-11/9/11 Revisions made based on comments as needed Consensus conference held 11/17-18/2012 Discussion of draft recommendations by attendees Recommendations approved by at least a 2/3 majority of delegates
  • Slide 27 - 2012 ACS/ASCCP/ASCP Cervical Cancer Screening Guidelines Saslow, Solomon, Lawson, et al. JLGTD, March 14, 2012 (online) Saslow, Solomon, Lawson, et al. CA: A Cancer J for Clinicians, March 14, 2012 (online)
  • Slide 28 - New ACS/ASCCP/ASCP Guidelines When to begin screening Cervical cancer screening should begin at age 21. Saslow, Solomon, Lawson, et al. JLGTD, March 14, 2012 (online) Saslow, Solomon, Lawson, et al. CA: A Cancer J for Clinicians, March 14, 2012 (online) Guidelines do not apply to special populations – hx of cervical cancer, DES exposure, & immune-compromise Women < 21 should not be screened regardless of age of sexual onset
  • Slide 29 - Cervical Cancer Incidence by Age Group, USCS*, 1998-2002 Rate per 100,000 Age 0-19 0.1 *United States Cancer Statistics includes data from CDC’s National Program of Cancer Registries and NCI’s Surveillance, Epidemiology and End Results Program. Saraiya M et al. Obstet Gynecol 2007;109:360-70. 20-29 4.5 30-39 13.9 40-49 16.5 50-64 15.4 65+ 14.6 All ages 9.4
  • Slide 30 - Adolescent Needs Care for contraception and STI screening/treatment. No Pap test No speculum exam for asymptomatic women STI testing can be done using urine
  • Slide 31 - Screening for ages 21-29 Cytology alone every 3 years HPV testing “should not be used to screen” Not as a component of cotesting Not as a primary stand-alone screen
  • Slide 32 - Rationale for Longer Pap Screening Intervals Sensitivity of single Pap test 50-70% Cancer risk 18mo after 3 neg Paps = 1.5/100,000 Cancer risk 36mo after 3 neg Paps = 4.7/100,000 99,997 women screened unnecessarily to help 3 Risk of HSIL/cancer <3 years after negative Pap not significantly higher than risk after 1year Longer Pap screening intervals (e.g., 5y) inappropriate for mobile US population Sawaya GF et al. Acta Cytol 2005;49:391-7
  • Slide 33 - Rationale for Longer Pap Screening Intervals-2 Screening harms: lifetime risk of colposcopy Screening q3y: 760 colpos/1000 women Screening q2y: 1080 colpos/1000 women Screening annually: 2000 colpos/1000 women Stout NK et al. Arch Intern Med 2008;168:181. Kulasingam S et al. 2011. AHRQ Publication No.11-05157-EF-1.
  • Slide 34 - Prevalence of HPV by Age, Manchester, U.K. Peto et al Br. J. Cancer (2004:91:942-53) Percentage HPV (+) Age Group
  • Slide 35 - Hariri S et al. J Infect Dis. 2011;204:566-573 Weighted Prevalence of Low-risk and High-risk HPV Types Among US Women 14–59yo, 2007-2010 (NHANES)
  • Slide 36 - Rationale for Avoiding HPV Tests Among Women Ages 21-29 Prevalence of carcinogenic HPV approaches 20% in teens and early 20s Most carcinogenic HPV infections resolve without intervention Identifying carcinogenic HPV that will resolve leads to repeated call-back, anxiety, and interventions without benefit
  • Slide 37 - Screening For Women Ages 30-64 Cytology + HPV testing (Cotesting) every 5 years is preferred Cytology alone every 3 years is acceptable
  • Slide 38 - Rationale for Cotesting, Ages 30-64 Increased detection of prevalent CIN3 Decreased CIN3 in subsequent screening rounds Achieves risk of CIN3 equal to cytology alone @ 1-3year intervals Enhances detection of adenocarcinoma/AIS Minimizes the increased number of colposcopies, thus it reduces harms.
  • Slide 39 - Why Not Cotesting for All Women 30-64? Some sites may lack access to HPV testing Financial Logistical Cytology remains effective Requires more frequent visits Requires more colposcopy for equivocal results
  • Slide 40 - Why Not Annual Cotesting? High NPV of one cotest means most abnormal screens at 1-3y intervals are transient HPV infection, not precancer Potential harms are amplified without benefit
  • Slide 41 - 61% 8% Rodriguez AC et al. J Natl Cancer Inst. 2008;100:513-17. Rapid clearance of HPV in Women >30 * Histological progression *
  • Slide 42 - Managing ASC-US/HPV negative tests “ Women with ASC-US cytology and negative HPV test results should continue screening per age-specific guidelines.” CIN3 risk of ASC-US/ HPV neg <2%, below threshold for colposcopy.
  • Slide 43 - Managing HPV+/Cytology- Cotests “Women cotesting HPV positive and cytology negative should be followed with either (1) repeat cotesting in 12 months, or (2) immediate HPV genotype-specific testing for HPV16 alone or HPV 16/18. Direct referral to colposcopy is not indicated”
  • Slide 44 - (1) Repeat cotest in 12 months If either repeat test is positive, refer to colposcopy If both tests are negative, return to routine screening.
  • Slide 45 - (2) Immediate HPV genotyping If HPV 16 or HPV16/18 positive, refer directly to colposcopy. If HPV 16 or HPV 16/18 negative, repeat cotest in 12 months and then… If either repeat test is positive, refer to colposcopy If both tests are negative, return to routine screening.
  • Slide 46 - Managing HPV+/Cytology- Cotests Rationale Consistent observational data indicate short term risk of CIN3 far below risk threshold of HPV+/ASC-US and LSIL used for colposcopy referral Evidence from cohort studies shows majority of transient infections clear by 12 months allowing most to return to routine screening without excessive risk.
  • Slide 47 - Predicted Impact of Pap Screening on Cancer Incidence Myers E 2006 ASCCP Biennial Meeting Las Vegas, NV
  • Slide 48 - When to Stop Screening Stop at age 65 for women with adequate negative prior screening, no CIN2+ within the last 20y. Definition of adequate negative screening: 3 consecutive negative Paps or 2 consecutive negative HPV tests (Tests within 10 years of stopping; most recent within 5 years.)
  • Slide 49 - Stop screening at age 65 Screening “should not resume for any reason, even if a woman reports having a new sexual partner.”
  • Slide 50 - Rationale for stopping at 65 years CIN2+ is rare after age 65 Most abnormal screens, even HPV+, are false + and do not reflect precancer HPV risk remains 5-10% Colposcopy/biopsy/treatment more difficult Harms are magnified Incident HPV infection unlikely to lead to cancer within remaining lifetime Chen HC et al. JNCI 2011;103:1387-96; Rodrigues AC et al. JNCI 2009;101:721-8
  • Slide 51 - When to stop screening - 2 Stop after hysterectomy with removal of cervix and no history of CIN2+ “Evidence of adequate negative prior screening is not required”
  • Slide 52 - Rationale for stopping after Hysterectomy Vag cancer rate is 7/million/year 663 vag cuff Paps needed to find one VAIN 2,066 women followed after hyst. for average 89 months 3% had VAIN, 0 had cancer Risk of Pap abnormality after hyst = 1%. Compare risk of breast cancer in men for which screening is not recommended. Pearce KF et al. NEJM 1996;335:1559-62; Piscitelli JT et al. AJOG 1995;173:424-30
  • Slide 53 - When NOT to stop at age 65 years If history of CIN2, CIN3, or AIS Continue “routine screening” for at least 20 years, “even if this extends screening past age 65.”
  • Slide 54 - Screening a Vaccinated Cohort “ Recommended screening practices should not change on the basis of HPV vaccination.” Vaccination against HPV 16/18 Reduces CIN3+ by 17-33% Reduces colposcopy by 10% Reduces treatment by 25% But who is vaccinated? Recall? Completed series? HPV naïve? Paavonen J et al. Lancet 2009;374:301-14
  • Slide 55 - HPV as a Primary Screening Test Strong NPV of HPV test suggests it might replace cotesting, but test specificity lacking Follow-up to HPV+ test remains unclear Pap? Repeat HPV in 1y? Genotyping? Colpo? Knowing HPV status biases cytology reports to abnormal Harms undefined No US prospective trials “In most clinical settings, women ages 30-65 should not be screened with HPV testing alone.”
  • Slide 56 - 2012 Standards
  • Slide 57 - Conclusion “The biggest gain in reducing cervical cancer incidence and mortality would be achieved by increasing screening rates among women rarely or never screened. . . Clinicians, hospitals, health plans, and public health officials should seek to identify and screen these women.” ACS, 20002
  • Slide 58 - Caveats Clinicians, patients, third-party payers, institutional review committees, other stakeholders, or the courts should never view recommendations as dictates. Even strong recommendations based on high-quality evidence will not apply to all circumstances and all patients. Users of guidelines may reasonably conclude that following some strong recommendations based on high quality evidence will be a mistake for some patients. No clinical practice guideline or recommendation can take into account all of the often compelling unique features of individual patients and clinical circumstances. Thus, nobody charged with evaluating clinician’s actions, should attempt to apply recommendations in rote or blanket fashion.
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