Power Doppler Quantification in Assessing Gestational Trophoblastic Neoplasia.

Area of Science:

• Gynecologic Oncology
• Medical Imaging
• Pharmacology

Background:

• The FIGO score has limitations in stratifying low-risk gestational trophoblastic neoplasia (GTN) patients who develop chemoresistance to methotrexate.
• Tumour vascularisation is a critical risk factor in GTN, and its quantification may enhance risk assessment.

Purpose of the Study:

• To evaluate the efficacy of Power Doppler ultrasound in quantifying tumour vascularisation.
• To determine if Power Doppler ultrasound can differentiate low-risk GTN patients who become chemoresistant from those who respond to treatment.

Main Methods:

• 187 low-risk GTN patients were prospectively studied.
• Power Doppler ultrasound was used to analyze tumour vascularisation, measuring the number of colour pixels (NCP), mean dB, power Doppler quantification (PDQ), and percentage of colour pixels (%CP).
• The performance of these indicators in distinguishing chemoresistant patients was assessed.

Main Results:

• The number of colour pixels (NCP) was significantly higher in chemoresistant patients (6151 ± 3192) compared to non-resistant patients (3435 ± 2060) (p < 0.001).
• PDQ and %CP also showed significant differences but with lower diagnostic performance (AUC 72% and 67%) compared to NCP (AUC 75%).
• The mean dB index did not show a significant difference between groups (p = 0.133).

Conclusions:

• Power Doppler ultrasound quantification of tumour vascularity shows promise as a non-invasive tool.
• This method can effectively distinguish low-risk GTN patients who are likely to become chemoresistant, aiding in personalized treatment strategies.