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Published in: European Radiology 12/2022

Open Access 08-08-2022 | Prostate Cancer | Urogenital

Validating the screening criteria for bone metastases in treatment-naïve unfavorable intermediate and high-risk prostate cancer - the prevalence and location of bone- and lymph node metastases

Authors: Erik Rud, Daniyal Noor, Kristina Flor Galtung, Fredrik Ottosson, Maciej Jacewicz, Eduard Baco, Peter Mæhre Lauritzen

Published in: European Radiology | Issue 12/2022

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Abstract

Objective

The European Association of Urology (EAU) recommends a bone scan for newly diagnosed unfavorable intermediate- and high-risk prostate cancer. We aimed to validate the screening criteria for bone metastases in patients with treatment-naïve prostate cancer.

Methods

This single-center retrospective study included all patients with treatment-naïve unfavorable intermediate- or high-risk prostate cancer. All underwent MRI of the lumbar column (T2Dixon) and pelvis (3DT2w, DWI, and T2 Dixon). The presence and location of lymph node and bone metastases were registered according to risk groups and radiological (rad) T-stage. The risk of lymph node metastases was assessed by odds ratio (OR).

Results

We included 390 patients, of which 68% were high-risk and 32% were unfavorable intermediate-risk. In the high-risk group, the rate of regional- and non-regional lymph node metastases was 11% and 6%, respectively, and the rate of bone metastases was 10%. In the unfavorable intermediate-risk group, the rate of regional- and non-regional lymph node metastases was 4% and 0.8%, respectively, and the rate of bone metastases was 0.8%. Metastases occurred exclusively in the lumbar column in 0.5% of all patients, in the pelvis in 4%, and the pelvis and lumbar column in 3%. All patients with bone metastases had radT3-4, and patients with radT3-4 showed a four-fold increased risk of lymph node metastases (OR 4.48, 95% CI: 2.1–9.5).

Conclusion

Bone metastases were found in 10% with high-risk prostate cancer and 0.8% with unfavorable intermediate-risk. Therefore, we question the recommendation to screen the unfavorable intermediate-risk group for bone metastases.

Key Points

• The rate of bone metastases was 10% in high-risk patients and 0.8% in the unfavorable intermediate-risk group.
• The rate of lymph-node metastases was 17% in high-risk patients and 5% in the unfavorable intermediate-risk group.
• No bone metastases were seen in radiologically localized disease.
Literature
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Metadata
Title
Validating the screening criteria for bone metastases in treatment-naïve unfavorable intermediate and high-risk prostate cancer - the prevalence and location of bone- and lymph node metastases
Authors
Erik Rud
Daniyal Noor
Kristina Flor Galtung
Fredrik Ottosson
Maciej Jacewicz
Eduard Baco
Peter Mæhre Lauritzen
Publication date
08-08-2022
Publisher
Springer Berlin Heidelberg
Published in
European Radiology / Issue 12/2022
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-022-08945-7

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