PURPOSE: Progress of the novel carbon ion radiotherapy (CIRT) in the treatment of cancers has created the need for a method to accurately evaluate the response. We investigated whether L-[11C]methyl-methionine (11C-methionine) uptake at pre- and post-CIRT could be an early response predictor in patients with pelvic recurrence of rectal cancer. PROCEDURES: 11C-Methionine-positron emission tomography (PET) was performed prospectively in 53 patients with pelvic recurrence of rectal cancer before CIRT, and 48 patients were performed 11C-methionine PET at 1 month after CIRT. 11C-Methionine tumor uptake was measured by the tumor to muscle ratio (T/M ratio). The T/M ratios were evaluated in relation to clinical outcomes such as local re-recurrence, distant metastasis, and survival. The response to CIRT was also judged by computed tomography (CT) and magnetic resonance imaging (MRI). 11C-Methionine PET judgment was compared with CT/MRI judgment regarding the relevance to clinical outcome. RESULTS: Baseline T/M ratio was 5.27+/-1.90 (mean+/-SD) in patients without developing local re-recurrence and 7.66+/-3.17 in patients with local re-recurrence (p=0.023, Mann-Whitney U test). Post-CIRT T/M ratios were 3.10+/-1.28 in patients without local re-recurrence and 6.15+/-2.98 in patients with local re-recurrence (p=0.006, Mann-Whitney U test). By Kaplan-Meier analysis with log-rank test, patients with a baseline T/M ratio of <or=7.6 or a post-CIRT T/M ratio of <or=5.0 had significant lower pelvic re-recurrence rate. However, the percent change (reduction rate) from baseline to post-CIRT T/M ratio did not have significant relation to pelvic re-recurrence. There were no significant differences between 11C-methionine results (baseline T/M ratio, post-CIRT T/M ratio and percent change) and other clinical parameters (distant metastasis and survival). CONCLUSION: 11C-methionine-PET can be used for early prediction of local re-recurrence after CIRT. Because CIRT is local therapy, (11)C-methionine-PET cannot predict distant metastasis or survival after CIRT.
PURPOSE: Progress of the novel carbon ion radiotherapy (CIRT) in the treatment of cancers has created the need for a method to accurately evaluate the response. We investigated whether L-[11C]methyl-methionine (11C-methionine) uptake at pre- and post-CIRT could be an early response predictor in patients with pelvic recurrence of rectal cancer. PROCEDURES: 11C-Methionine-positron emission tomography (PET) was performed prospectively in 53 patients with pelvic recurrence of rectal cancer before CIRT, and 48 patients were performed 11C-methionine PET at 1 month after CIRT. 11C-Methioninetumor uptake was measured by the tumor to muscle ratio (T/M ratio). The T/M ratios were evaluated in relation to clinical outcomes such as local re-recurrence, distant metastasis, and survival. The response to CIRT was also judged by computed tomography (CT) and magnetic resonance imaging (MRI). 11C-Methionine PET judgment was compared with CT/MRI judgment regarding the relevance to clinical outcome. RESULTS: Baseline T/M ratio was 5.27+/-1.90 (mean+/-SD) in patients without developing local re-recurrence and 7.66+/-3.17 in patients with local re-recurrence (p=0.023, Mann-Whitney U test). Post-CIRT T/M ratios were 3.10+/-1.28 in patients without local re-recurrence and 6.15+/-2.98 in patients with local re-recurrence (p=0.006, Mann-Whitney U test). By Kaplan-Meier analysis with log-rank test, patients with a baseline T/M ratio of <or=7.6 or a post-CIRT T/M ratio of <or=5.0 had significant lower pelvic re-recurrence rate. However, the percent change (reduction rate) from baseline to post-CIRT T/M ratio did not have significant relation to pelvic re-recurrence. There were no significant differences between 11C-methionine results (baseline T/M ratio, post-CIRT T/M ratio and percent change) and other clinical parameters (distant metastasis and survival). CONCLUSION:11C-methionine-PET can be used for early prediction of local re-recurrence after CIRT. Because CIRT is local therapy, (11)C-methionine-PET cannot predict distant metastasis or survival after CIRT.
Authors: Betty S Pio; Cecilia K Park; Richard Pietras; Wei-Ann Hsueh; Nagichettiar Satyamurthy; Mark D Pegram; Johannes Czernin; Michael E Phelps; Daniel H S Silverman Journal: Mol Imaging Biol Date: 2006 Jan-Feb Impact factor: 3.488
Authors: B Långström; G Antoni; P Gullberg; C Halldin; P Malmborg; K Någren; A Rimland; H Svärd Journal: J Nucl Med Date: 1987-06 Impact factor: 10.057
Authors: P Lindholm; S Leskinen-Kallio; R Grénman; P Lehikoinen; K Någren; M Teräs; U Ruotsalainen; H Joensuu Journal: Int J Radiat Oncol Biol Phys Date: 1995-06-15 Impact factor: 7.038
Authors: Stephanie E Combs; Meinhard Kieser; Daniel Habermehl; Jürgen Weitz; Dirk Jäger; Piero Fossati; Roberto Orrechia; Rita Engenhart-Cabillic; Richard Pötter; Manjit Dosanjh; Oliver Jäkel; Markus W Büchler; Jürgen Debus Journal: BMC Cancer Date: 2012-04-03 Impact factor: 4.430