Rapid identification of mixed up bladder biopsy specimens using polymorphic microsatellite markers

Area of Science:

• Pathology
• Molecular Biology
• Genetics

Background:

• Standard registration of surgical specimens can lead to loss of identification numbers.
• A case involving two series of small bladder biopsies with identical registration numbers highlights specimen identification challenges.
• Similar histological findings, including carcinoma in situ, complicated specimen differentiation.

Purpose of the Study:

• To develop and validate a molecular method for distinguishing between small, paraffin-embedded bladder biopsies with identical registration numbers.
• To assess the utility of polymerase chain reaction (PCR)-driven microsatellite marker analysis for specimen identification in surgical pathology.

Main Methods:

• Utilized polymerase chain reaction (PCR) amplification of five different microsatellite markers.
• Analyzed banding patterns generated from microsatellite marker analysis to differentiate between biopsy series.
• Histological examination and molecular analysis were performed on paraffin-embedded bladder biopsy specimens.

Main Results:

• Successfully distinguished between the two series of mixed-up bladder biopsies within 48 hours using microsatellite marker analysis.
• Identified two distinct banding patterns corresponding to the two biopsy series.
• Observed microsatellite instability in one carcinoma in situ biopsy, suggesting potential intratumor heterogeneity or multifocality.

Conclusions:

• Microsatellite marker analysis via PCR is an effective method for resolving identification issues with small, paraffin-embedded biopsies.
• This molecular technique ensures accurate specimen tracking in surgical pathology.
• Findings suggest microsatellite analysis may also provide insights into tumor biology, such as heterogeneity.