Interlaboratory reliability of Hybrid Capture 2.

Area of Science:

• Clinical diagnostics
• Molecular virology
• Gynecologic oncology

Background:

• The Hybrid Capture 2 (HC2) assay is widely used for detecting oncogenic human papillomavirus (HPV) DNA.
• Ensuring interlaboratory reproducibility is critical for the reliable implementation of HPV testing in clinical practice.
• The ASCUS and LSIL Triage Study (ALTS) provided a robust dataset for evaluating diagnostic test performance.

Purpose of the Study:

• To assess the interlaboratory reproducibility of the HC2 assay for oncogenic HPV DNA detection.
• To evaluate the consistency of HC2 test results across multiple clinical center (CC) laboratories and a central quality control (QC) laboratory.
• To determine the reliability of HC2 testing within the context of the ALTS study.

Main Methods:

• Utilized residual liquid cytology specimens from the ALTS study.
• Compared results from 4 CC laboratories with those from a central HPV QC laboratory.
• Employed stratified random sampling for specimen selection (N=1,175) and retesting.
• Analyzed agreement using kappa statistics.

Main Results:

• Overall kappa value between CC laboratories and the HPV QC laboratory was 0.84, indicating substantial agreement.
• Individual CCs showed kappa values ranging from 0.79 to 0.89.
• Agreement was highest for abnormal or equivocal cytologic findings (kappa ≥ 0.80) and lowest for negative findings (kappa = 0.73).

Conclusions:

• The HC2 assay demonstrates reliable interlaboratory reproducibility for oncogenic HPV DNA detection.
• The HC2 test is a dependable tool for clinical use, particularly for identifying HPV in women with abnormal cytologic findings.
• These findings support the use of HC2 as a consistent and accurate method for HPV DNA testing in large-scale studies and routine diagnostics.