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Fixation time does not affect expression of HER2/neu: a pilot study.

Julio A Ibarra¹, Lowell W Rogers

¹MemorialCare Breast Center, Orange Coast Memorial Medical Center, 9920 Talbert Ave, Fountain Valley, CA 91708, USA.

American Journal of Clinical Pathology

|September 22, 2010

Summary

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Fixation time in formalin does not affect HER2/neu expression. This study found no significant differences in HER2/neu immunohistochemical analysis results across various fixation durations for breast cancer tissue samples.

Area of Science:

Oncology
Pathology
Biochemistry

Background:

HER2/neu expression is critical for breast cancer diagnosis and treatment.
Variability in immunohistochemical (IHC) analysis results, potentially due to pre-analytical factors like tissue fixation, is a concern.

Purpose of the Study:

To investigate the impact of varying fixation durations (3 to 120 hours) in 10% buffered formalin on HER2/neu expression.
To determine if fixation time influences HER2/neu IHC scoring in invasive breast cancer.

Main Methods:

Ten invasive breast cancer tissue samples were fixed for 3, 48, 72, 96, and 120 hours.
Tissue processing and batch staining for HER2/neu using PATHWAY HER2/neu clone 4B5 antibody on a Ventana BenchMark XT processor.
IHC slides were reviewed and scored for staining intensity and percentage of positive cells.

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Main Results:

No statistically significant differences were observed in HER2/neu staining intensity.
The percentage of HER2/neu-positive cells remained consistent across all tested fixation times.
Fixation duration did not appear to impact the reliability of HER2/neu IHC results.

Conclusions:

Fixation times ranging from 3 to 120 hours in 10% buffered formalin do not significantly alter HER2/neu expression as assessed by IHC.
Standardized fixation protocols within this range are likely adequate for reliable HER2/neu testing in breast cancer diagnostics.