Electrical properties of prostatic tissues: I. Single frequency admittivity properties

Area of Science:

• Biomedical Engineering
• Urological Oncology
• Electrical Impedance Spectroscopy

Background:

• Prostate cancer diagnosis often relies on methods with limitations.
• Electrical properties of biological tissues may offer unique contrast for disease detection.

Purpose of the Study:

• To evaluate the efficacy of electrical properties in discriminating malignant prostate cancer from benign prostate tissues.
• To assess the diagnostic potential of electrical admittivity for prostate cancer identification.

Main Methods:

• Electrical admittivity (conductivity and permittivity) was measured in 50 ex vivo human prostates across 31 frequencies (0.1-100 kHz).
• A specialized admittivity probe was used for ex vivo tissue analysis.
• Precise colocalization of probed tissue and histological assessment was ensured.

Main Results:

• Cancer tissues exhibited significantly lower conductivity than benign tissues across all frequencies (p <0.05).
• Cancer tissues showed significantly higher permittivity than benign tissues at 100 kHz (p <0.0001).
• Permittivity at 100 kHz demonstrated optimal discrimination with 77% specificity and 70% sensitivity (ROC AUC 0.798).

Conclusions:

• Electrical admittivity properties provide promising contrast for differentiating prostate cancer from benign tissues.
• The sensitivity and specificity of this electrical method may surpass current prostate-specific antigen screening at low levels.
• This technique represents a potential adjunctive tool for prostate cancer diagnosis.