Purpose: The objective of the present study was to analyze, with relatively high sensitivity and specificity, uptake properties of [(11)C]-choline in prostate cancer patients by means of positron-emission tomography (pet)/computed tomography (ct) imaging using objectively defined pet parameters to test for statistically significant changes before, during, and after external-beam radiation therapy (ebrt) and to identify the time points at which the changes occur.
Methods: The study enrolled 11 patients with intermediate-risk prostate cancer treated with ebrt, who were followed for up to 12 months after ebrt. The [(11)C]-choline pet scans were performed before treatment (baseline); at weeks 4 and 8 of ebrt; and at 1, 2, 3, 6, and 12 months after ebrt.
Results: Analysis of [(11)C]-choline uptake in prostate tissue before treatment resulted in a maximum standardized uptake value (suvmax) of 4.0 ± 0.4 (n = 11) at 40 minutes after injection. During week 8 of ebrt, the suvmax declined to 2.9 ± 0.1 (n = 10, p < 0.05). At 2 and 12 months after ebrt, suvmax values were 2.3 ± 0.3 (n = 10, p < 0.01) and 2.2 ± 0.2 (n = 11, p < 0.001) respectively, indicating that, after ebrt, maximum radiotracer uptake in the prostate was significantly reduced. Similar effects were observed when analyzing the tumour:muscle ratio (tmr). The tmr declined from 7.4 ± 0.6 (n = 11) before ebrt to 6.1 ± 0.4 (n = 11, nonsignificant) during week 8 of ebrt, to 5.6 ± 0.03 (n = 11, p < 0.05) at 2 months after ebrt, and to 4.4 ± 0.4 (n = 11, p < 0.001) at 12 months after ebrt.
Conclusions: Our study demonstrated that intraprostatic [(11)C]-choline uptake in the 11 analyzed prostate cancer patients significantly declined during and after ebrt. The pet parameters SUVmax and tmr also declined significantly. These effects can be detected during radiation therapy and up to 1 year after therapy. The prognostic value of these early and statistically significant changes in intraprostatic [(11)C]-choline pet avidity during and after ebrt are not yet established. Future studies are indicated to correlate changes in [(11)C]-choline uptake parameters with long-term biochemical recurrence to further evaluate [(11)C]-choline pet changes as a possible, but currently unproven, biomarker of response.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3615852 | PMC |
| http://dx.doi.org/10.3747/co.20.1217 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Reply to: Inferior Control Arms in Prostate Cancer Trials: The ARANOTE Trial.
J Clin Oncol
January 2025
Fred Saad, MD, University of Montreal, Montreal, QC, Canada; Egils Vjaters, MD, P. Stradinš Clinical University Hospital, Riga, Latvia; Isabella Testa, MD, Bayer S.p.A, Milan, Italy; and Kunhi Parambath Haresh, MD, All India Institute of Medical Sciences, New Delhi, India.
Inferior Control Arms in Prostate Cancer Trials: The ARANOTE Trial.
J Clin Oncol
January 2025
Abhenil Mittal, MD, DM, MBBS and Geordie Linford, MD, MSc, BSc, Department of Oncology, Northeast Cancer Center, Health Sciences North, Sudbury, ON, Canada, Division of Clinical Sciences, Northern Ontario School of Medicine, ON, Canada; and Bishal Gyawali, MD, PhD, FASCO, Department of Oncology, Queen's University, Kingston, ON, Canada, Department of Public Health Sciences, Queen's University, Kingston, ON, Canada, Division of Cancer Care and Epidemiology, Queen's University, Kingston, ON, Canada.
Kidney and gallbladder stones and the risk of prostate cancer: Results from the EPICAP study.
PLoS One
January 2025
UVSQ, Inserm, Gustave Roussy, CESP, Université Paris-Saclay, Villejuif, France.
Background: Prostate cancer remains the most frequent cancer among men, representing a significant health burden. Despite its high morbidity and mortality rates, the etiology of prostate cancer remains relatively unknown, with only non-modifiable established risk factors. Chronic inflammation has emerged as a potential factor in prostate carcinogenesis.
View Article and Find Full Text PDFSynthesis, Preclinical Evaluation, and First-in-Human Assessment of ICG-PSMA-D5: A PSMA-Targeted Probe for Fluorescence-Guided Surgery of Prostate Cancer.
J Med Chem
January 2025
Key Laboratory of Radiopharmaceuticals, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China.
Precise surgical resection of prostate cancer (PCa) is a significant clinical challenge due to the impact of positive surgical margins on postoperative outcomes. Fluorescence-guided surgery (FGS) enables real-time tumor visualization using fluorescent probes. In this study, we synthesized and evaluated an indocyanine green (ICG)-based PSMA-targeted near-infrared probe, , for intraoperative imaging of PCa lesions.
View Article and Find Full Text PDFAdvancements in molecular imaging probes for precision diagnosis and treatment of prostate cancer.
J Zhejiang Univ Sci B
January 2025
Department of Orthopedics, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310006, China.
Prostate cancer is the second most common cancer in men, accounting for 14.1% of new cancer cases in 2020. The aggressiveness of prostate cancer is highly variable, depending on its grade and stage at the time of diagnosis.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!