Utility of Competitive Reverse Transcription-Polymerase Chain Reaction Analysis of Specific CD44 Variant RNA for...

Area of Science:

• Oncology
• Molecular Biology
• Urology

Background:

• CD44 splice variants are implicated in various cancers.
• Distinguishing upper urinary tract transitional-cell carcinomas (UUT-TCC) noninvasively remains a challenge.
• Previous methods for detecting cancer cells in body fluids have limitations.

Purpose of the Study:

• To evaluate the diagnostic utility of CD44 v8-10/CD44 v10 competitive reverse transcription-polymerase chain reaction (CC-RT-PCR) for UUT-TCC.
• To assess CD44 splice variant expression in UUT-TCC tissues and compare it with normal tissues.
• To determine the efficacy of CC-RT-PCR in detecting UUT-TCC from urine samples.

Main Methods:

• RT-PCR was used to analyze CD44 splice variant expression in UUT-TCC and adjacent normal tissues.
• CC-RT-PCR was applied to urine samples from patients with UUT-TCC and benign urologic diseases.
• Results were compared with cytologic examination findings.

Main Results:

• CD44v8-10 was predominantly expressed in 84% of UUT-TCC specimens, with minimal expression in normal tissues.
• CC-RT-PCR correctly identified UUT-TCC in 26 out of 40 urine samples by detecting dominant CD44v8-10 expression.
• All benign disease samples showed predominant CD44v10 expression.
• CC-RT-PCR demonstrated a significantly higher positive rate than cytology, particularly for low-grade UUT-TCC.

Conclusions:

• CD44v8-10 is a specific marker for UUT-TCC.
• CC-RT-PCR is a sensitive and specific noninvasive diagnostic tool for UUT-TCC.
• This molecular approach offers a promising alternative to conventional diagnostic methods for UUT-TCC.