A population-based cervical cancer screening program in a district hospital in Tamil Nadu is being evaluated. The program uses Pap smear as the primary screening test. Among 5,000 women screened, 450 had abnormal results. Of these 450, 90 were confirmed to have cervical intraepithelial neoplasia (CIN) grade 2 or higher on colposcopy-guided biopsy. The remaining 360 had benign findings. What is the most appropriate next step to improve the efficiency of this screening program?

Explanation

## Optimizing Cervical Cancer Screening: Triage Strategy **Key Point:** The current program has a positive predictive value (PPV) of only 20% (90/450), meaning 80% of Pap-positive women undergo unnecessary colposcopy. HPV triage of Pap-positive cases significantly improves efficiency by reducing unnecessary procedures. ### Current Program Performance Analysis | Metric | Value | Interpretation | |--------|-------|----------------| | Pap smear positivity | 450/5000 = 9% | High false-positive rate | | PPV of Pap smear | 90/450 = 20% | Only 1 in 5 abnormal Paps have CIN2+ | | Specificity (implied) | 4550/4550 = 100% | Good at ruling out disease when negative | | Colposcopy procedures needed | 450 | High burden; many unnecessary | **High-Yield:** HPV testing has ~95% sensitivity and ~90% specificity for CIN2+. When used as a triage test for Pap-positive women, it reduces colposcopy referrals by ~50–70% while maintaining detection of clinically significant lesions. ### Triage Strategy: Pap + HPV Reflex 1. Perform Pap smear (primary screening) 2. If Pap abnormal → reflex to HPV testing (same specimen) 3. If HPV positive → refer to colposcopy 4. If HPV negative → routine screening (low risk of CIN2+) **Mnemonic:** **SHAPE** = Screen, HPV-triage, Assess risk, Proceed to colposcopy, Evaluate outcomes ### Why Triage Improves Efficiency - Reduces unnecessary colposcopy procedures - Decreases patient anxiety and healthcare burden - Maintains sensitivity for clinically significant disease - Cost-effective in resource-limited settings ```mermaid flowchart TD A[Pap Smear Screening]:::action --> B{Pap Result?}:::decision B -->|Normal| C[Routine screening in 3 years]:::outcome B -->|Abnormal| D[HPV Triage Test]:::action D --> E{HPV Positive?}:::decision E -->|Yes| F[Colposcopy]:::action E -->|No| G[Routine screening in 1 year]:::outcome F --> H{CIN2+ Found?}:::decision H -->|Yes| I[Treatment]:::action H -->|No| J[Follow-up per protocol]:::outcome ``` **Clinical Pearl:** In the given program, if HPV triage had been used, approximately 360 × 0.90 = 324 women (assuming 90% HPV specificity in benign cases) would have been spared unnecessary colposcopy. [cite:Park 26e Ch 9; WHO Guidelines on Cervical Cancer Screening]