NCT07208487

Clinical Study of Pretreatment PET/CT Parameters for Predicting the Efficacy of 125I Seed Implantation in the Treatment of Malignant Tumors

• Status: Completed
• Phase: —
• Study type: Observational
• Enrollment: 41 (actual)
• Sponsor: Jiangxi Provincial Cancer Hospital · Academic / Other
• Sex: All
• Age: —
• Healthy volunteers: Not accepted

Summary

This study aimed to determine if pre-treatment 18F-FDG PET/CT metabolic parameters could predict the effectiveness of 125I seed implantation for malignant tumors. In a retrospective analysis of 41 patients with 69 lesions, various parameters were measured. The results identified Metabolic Tumor Volume (MTV) as the most significant independent prognostic factor, outperforming other standardized uptake values (SUV) and ratios. A higher MTV was associated with a worse treatment outcome, suggesting it is a valuable predictor for guiding treatment decisions.

Detailed description

Objective The purpose of the research is to assess the role of pretreatment 18F-FDG PET/CT parameters in predicting the efficacy of 125I seed implantation in the treatment of malignant tumors, in order to allow for timely clinical interventions and adjustments in the treatment regimen. Methods A retrospective analysis was made on patients who were treated with 125I seed implantation for malignant tumors and underwent 18F-FDG PET/CT before treatment from November 2019 to November 2023 in our hospital. The clinical data of 41 patients with 69 lesions were collected completely, including age, gender, primary tumor and seed implantation sites. Metabolic parameters including TLG, MTV, SUVmax-bw, SUVmax-bsa, SUVmax-lbm, SUVmean-bw, SUVmean-bsa, SUVmean-lbm, SUVpeak-bw, SUVpeak-bsa, SUVpeak-lbm, TLR, TLMR, TBR and TBMR were measured at pretreatment PET/CT. The patients were followed up at 4 months after the procedure by CT scans. The efficacy of response was evaluated by using the response evaluation criteria in solid tumors (RECIST1.1). Results The area under the curves for TLG and MTV were 0.815 (P\<0.001) and 0.804 (P\<0.001) respectively. Univariate logistic regression analysis and multivariate logistic regression analysis. The results showed that only the MTV (OR: 6.477, 95%CI: 1.157-36.271, P=0.034) was an independent prognostic factor for the efficacy of 125I seed implantation for malignant tumors. Conclusion In patients with malignant tumors treated with 125I seed implantation, the 18F-FDG PET/CT parameters MTV in the prediction of the efficacy was superior to SUVmax, SUVmean and SUVpeak which normalized by body weight, body surface area and lean body mass, as well as to TLR, TLMR, TBR and TBMR. The 18F-FDG PET/CT parameter MTV was an independent prognostic factor for the efficacy of 125I seed implantation in the treatment of malignant tumors.

Conditions

• Malignant Tumors

Timeline

• Start date: 2019-01-01
• Primary completion: 2024-11-01
• Completion: 2024-12-01
• First posted: 2025-10-06
• Last updated: 2025-10-06

Locations

1 site across 1 country: China