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

Jiangxi Provincial Cancer Hospital

Status: Completed

Conditions: Malignant Tumors

Study type: Observational

Funder types: Other

Identifiers

NCT07208487

2025ky281

Details and patient eligibility

About

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.

Full 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.

Enrollment: 41 patients

Sex: All

Volunteers: No Healthy Volunteers

Inclusion criteria

(1) Interval between PET/CT imaging and 125I seed implantation ≤4 weeks; (2)CT follow-up performed 4 months post-125I seed implantation; (3) Primary tumor pathologically or cytologically diagnosed as malignant; (4) Metastatic or recurrent lesions implanted with 125I confirmed by cytological aspiration or imaging

Exclusion criteria

(1) Lesions too small or SUVmax < 2.5, rendering them unidentifiable by software for PET/CT parameter measurement; (2) Two 125I seed implantation procedures performed within 6 months for the same lesion; (3) Incomplete clinical or imaging data.

Trial design

41 participants in 1 patient group

125I seed implantation treatment group

Description:

Inform the patient of relevant precautions and obtain signed informed consent. Upload CT data in DICOM format to the TPS system. Contour the tumor target volume and critical organs layer by layer. Design the needle insertion direction, angle, and depth. Determine the prescribed dose, number of implants, and activity. Obtain the Dose and Volume Histogram (DVH). For patients without prior external beam radiotherapy, the prescribed dose is 120 Gy. For those with prior external beam radiotherapy, the prescribed dose ranges from 80 to 100 Gy, ensuring surrounding critical organs receive doses within safe limits. Position, immobilize, disinfect, and drape the patient according to surgical positioning. After instructing the patient to hold their breath, perform CT scanning for localization. Following local anesthesia, complete particle implantation according to the preoperative plan. After particle implantation, perform another CT scan to verify dose distribution.