Prevent

Cervical Cancer Screening

search

Cervical Cancer Screening, Pap Smear Intervals

  • Management
  • Extremely Low Risk Patients - Pap Smear not necessary
  1. Age under 21 years old
  2. Hysterectomy for benign disease (see below)
    1. Recent studies suggest no further Pap Smears needed
  3. Age 65-70 or over (AAFP and USPTF recommend age 65)
    1. Two consecutive negative Pap Smears with HPV testing, with most recent test within last 5 years OR
    2. Three normal consecutive Pap Smears and no abnormal Pap Smears in the last 10 years (ACS)
  • Management
  • Average Risk Patients
  1. Protocol (varies by ACS, ACOG and USPHS)
    1. Initial screening age 21 to 30 years old
      1. Thin Prep Pap Smear cytology without HPV testing once every 3 years for those under 30 years
      2. Do not test HPV with Pap Smear for those under age 25 years (high Prevalence)
        1. Those age 25-30 years may benefit from HPV testing every 3 years
    2. Age 30 to 65 years old (with intact Uterus and Cervix)
      1. Cotesting with Cytology and HPV testing every 5 years (ACOG, ACP, USPTF, AAFP) OR
      2. Cytology alone every 3 years (ACOG, ACP, USPTF, AAFP) OR
      3. Primary HPV Testing without cytology every 3 years (ASCCP)
    3. Age over 65 years old
      1. No screening needed if adequate negative Pap Smear history
  2. Criteria: Average Risk
    1. Cervical Cancer Screening starts at age 21 years regardless of sexual activity
    2. Cervical Cancer Screening is not needed in very low risk patients (see above)
    3. High risk patients require more specific screening (see below)
  • Management
  • High Risk Patients
  1. Protocol
    1. Start screening immunosuppressed patients within one year of onset sexual activity
    2. Specific protocols exist for history Cervical Dysplasia or cancer, high risk HPV findings
  2. High risk criteria
    1. Significant Cervical Dysplasia (CIN2, CIN3, CIS) or Cervical Cancer history
    2. In Utero Diethylstilbestrol Exposure
    3. Immunocompromised patients
    4. HIV positive
  3. Other higher risk criteria that may prompt closer monitoring
    1. Sexual activity onset before age 20 years
      1. Screen and prevent Sexually Transmitted Diseases
    2. Patients with three or more lifetime sexual partners
    3. History of HPV or other Sexually Transmitted Disease
    4. Tobacco abuse
  1. Total Hysterectomy without uterine or Cervical Cancer
    1. No further Cervical Cancer Screening
  2. Total Hysterectomy related to cancer history
    1. Continue screening for 20 years
    2. Obtain vaginal cytology every 3 years (or cotesting with HPV every 5 years)
  1. USPSTF Strength of Recommendation: A
  2. Original slide testing had issue of false negative Pap Smears
    1. Importance
      1. Accounts for 30% of U.S. Cervical Cancer cases/years
      2. Accounts for 3,700 Cervical Cancer cases/year
    2. Causes
      1. Incomplete transformation zone sampling
      2. Poorly prepared slide (e.g. drying artifact)
      3. Cytotechnologist failure to detect abnormality
        1. Now limited to 100 slides per day for review
        2. Now 10% of "normal" slides re-screened
  3. Adjunctive methods to decrease False Negative Rate
    1. General
      1. Adjuncts identify more LGSIL lesions, but may lead to over-testing
    2. Liquid-Based/Thin-Layer Preparation
      1. Improves cell sample and fixation
      2. Commercial Tests
        1. Thin Prep
        2. AutoCyte Prep (TriPath)
    3. Computer-Assisted Screening
      1. AutoPap: Scores slide on likeliood of abnormality
      2. AutoCyte: Presents cell images to cytopathologist
    4. HPV Testing
      1. Hybrid Capture II detects 13 high risk HPV types
      2. Not recommended outside age of 25 to 65 years old, or if immunocompromised
  4. References
    1. Nuovo (2001) Am Fam Physician 64:780-6 [PubMed]