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Factors predicting successful DNA recovery from archival cervical smear samples
K Canfell1, W Gray, P Snijders
1Polartechnics, Sydney, NSW 2011, Australia. KarenCancell@compuserve.com
Summary
Older cervical smear slides yield more human papillomavirus (HPV) DNA for testing. DNA recovery rates increased with slide age, suggesting fixation methods impact DNA retrieval for PCR analysis.
Area of Science:
- Molecular Biology
- Pathology
- Genetics
Background:
- Polymerase chain reaction (PCR)-based DNA testing is crucial for retrospectively detecting human papillomavirus (HPV) in archival cervical smears.
- Cellular DNA recovery tests ensure sample integrity for accurate HPV DNA analysis.
- Limited data exists on DNA recovery rates from cervical slides older than 13 years.
Purpose of the Study:
- To investigate factors influencing DNA recovery from archival cervical smear slides.
- To assess DNA recovery rates in relation to slide age and fixation methods.
Main Methods:
- Analysis of 436 UK archival cervical smear slides, aged 11 to 33 years.
- Parallel testing of cellular DNA recovery and HPV DNA.
- Statistical analysis to determine trends in DNA recovery based on slide age.
Main Results:
- An overall cellular DNA recovery success rate of 29% was achieved.
- A significant positive correlation was found between slide age and DNA recovery rates (P < 0.001).
- Recovery rates increased from 22% (1988-1992) to 61% (1970-1972).
Conclusions:
- Older cervical smear slides demonstrate higher DNA recovery rates.
- Fixation methods, particularly those using acetic acid introduced in the 1980s, may negatively impact DNA recovery for PCR.
- The original fixation method is critical for successful DNA recovery from archival samples.