68Ga-PSMA PET/CT and volumetric morphology of PET-positive lymph nodes stratified by tumor differentiation of prostate cancer
68Ga-prostate-specific membrane antigen (PSMA) PET/CT is a new method to detect early nodal metastases in patients with biochemical relapse of prostate cancer. In this retrospective investigation, the dimensions, volume, localization, and SUVmax of nodes identified by 68Ga-PSMA were correlated to th...
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| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
Jun. 21, 2017
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| In: |
Journal of nuclear medicine
Year: 2017, Jahrgang: 58, Heft: 12, Pages: 1949-1955 |
| ISSN: | 2159-662X |
| DOI: | 10.2967/jnumed.116.185033 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.2967/jnumed.116.185033 Verlag, kostenfrei, Volltext: http://jnm.snmjournals.org/content/58/12/1949 
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| Verfasserangaben: | Maria Vinsensia, Peter L. Chyoke, Boris Hadaschik, Tim Holland-Letz, Jan Moltz, Klaus Kopka, Isabel Rauscher, Walter Mier, Markus Schwaiger, Uwe Haberkorn, Tobias Mauer, Clemens Kratochwil, Matthias Eiber, Frederik L. Giesel |
MARC
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| 245 | 1 | 0 | |a 68Ga-PSMA PET/CT and volumetric morphology of PET-positive lymph nodes stratified by tumor differentiation of prostate cancer |c Maria Vinsensia, Peter L. Chyoke, Boris Hadaschik, Tim Holland-Letz, Jan Moltz, Klaus Kopka, Isabel Rauscher, Walter Mier, Markus Schwaiger, Uwe Haberkorn, Tobias Mauer, Clemens Kratochwil, Matthias Eiber, Frederik L. Giesel |
| 246 | 3 | 3 | |a 68 Ga-PSMA PET/CT and volumetric morphology of PET-positive lymph nodes stratified by tumor differentiation of prostate cancer |
| 264 | 1 | |c Jun. 21, 2017 | |
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| 520 | |a 68Ga-prostate-specific membrane antigen (PSMA) PET/CT is a new method to detect early nodal metastases in patients with biochemical relapse of prostate cancer. In this retrospective investigation, the dimensions, volume, localization, and SUVmax of nodes identified by 68Ga-PSMA were correlated to their Gleason score (GS) at diagnosis. Methods: All PET/CT images were acquired 60 ± 10 min after intravenous injection of 68Ga-PSMA (mean dose, 176 MBq). In 147 prostate cancer patients (mean age, 68 y; range, 44-87 y) with prostate-specific antigen relapse (mean prostate-specific antigen level, 5 ng/mL; range, 0.25-294 ng/mL), 362 68Ga-PSMA PET-positive lymph nodes (LNs) were identified. These patients were classified on the basis of their histopathology at primary diagnosis into either low- (GS ≤ 6, well differentiated), intermediate- (GS = 7, moderately differentiated), or high-GS cohorts (GS ≥ 8, poorly differentiated prostate cancer). Using semiautomated LN segmentation software (Fraunhofer MEVIS), we measured node volume and short-axis dimensions (SADs) and long-axis dimensions based on CT and compared with the SUVmax. Nodes demonstrating uptake of 68Ga-PSMA with an SUVmax of 2.0 or more were considered PSMA-positive, and nodes with an SAD of 8 mm or more were considered positive by morphologic criteria. Results: Mean SUVmax was 13.5 (95% confidence interval [CI], 10.9-16.1), 12.4 (95% CI, 9.9-14.9), and 17.8 (95% CI, 15.4-20.3) within the low-, intermediate-, and high-GS groups, respectively. The morphologic assessment of the 68Ga-PSMA-positive LN demonstrated that the low-GS cohort presented with smaller 68Ga-PSMA-positive LNs (mean SAD, 7.7 mm; n = 113), followed by intermediate- (mean SAD, 9.4 mm; n = 122) and high-GS cohorts (mean SAD, 9.5 mm; n = 127). On the basis of the CT morphology criteria, only 34% of low-GS patients, 56% of intermediate-GS patients, and 53% of high-GS patients were considered CT positive. Overall, 68Ga-PSMA imaging led to a reclassification of stage in 90 patients (61%) from cN0 to cN1 over CT. Conclusion: 68Ga-PSMA PET is a promising modality in biochemical recurrent prostate cancer patients for N staging. Conventional imaging underestimates LN involvement compared with PSMA molecular staging score in each GS cohort. The sensitivity of 68Ga-PSMA PET/CT enables earlier detection of subcentimeter LN metastases in the biochemical recurrence setting. | ||
| 650 | 4 | |a lymph node | |
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| 650 | 4 | |a PSMA PET/CT | |
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