Technologies for image-guided surgery for managing lymphatic metastases in prostate cancer

Abstract

One of the challenges for the surgical management of prostate cancer is the lymphatic spread of metastases. Lymph node metastases vary in size (micrometastases (<2 mm) or macrometastases (>2 mm)), and their interactions with the lymphatic environment differ (whether they are hypoxic or connected to blood flow). Thus, devising a universal imaging system and an image-guided surgical approach that supports the resection of all affected lymph nodes is difficult. Two complementary approaches to identifying affected lymph nodes have been described as alternatives to performing a traditional pelvic lymph node dissection: lymphatic mapping using radioguidance (the most widely applied modality), fluorescence guidance, integrated hybrid radioguidance and fluorescence guidance or magnetic guidance; and surgery guided by radiolabelled prostate-specific membrane antigen. Careful patient selection using preoperative imaging seems to be a crucial aspect in determining whether one of the individual image-guided surgery procedures alone would be optimal or whether a combination would be considered to be the most desirable course of action. The successful implementation and dissemination of both lymph-node-targeted and disease-targeted procedures are very much reliant on ongoing technical developments in the field and their standardization and interpretation. However, when these innovative surgical procedures are fully refined, evaluation of their influence on oncological outcome is imperative.

Key points

  • Technologies for image-guided surgery for the management of lymphatic prostate cancer metastases are in much demand.

  • Lymphatic mapping procedures are the most reliable modalities for identifying micrometastases.

  • To date, approaches targeting prostate-specific membrane antigen seem to yield the most reliable identification of macrometastases, enabling efficient resection.

  • Preoperative imaging is an essential aspect of image-guided surgery as it provides the anatomical context required to guide the urologist to the area of interest, enabling optimal application of intraoperative imaging or tracing modalities.

  • The physical restrictions of the imaging signatures and tracers used to achieve surgical guidance (such as specificity, tissue penetration and spatial resolution) define the way in which imaging modalities are applied in medical care.

  • Combining the ability of lymphatic mapping to identify micrometastases (<2 mm) with tumour-targeted approaches that pinpoint the location of macrometastases (>2 mm) could provide superior identification of tumour-infiltrated lymph nodes.

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Fig. 1: An extended pelvic lymph node dissection template.
Fig. 2
Fig. 3: Attenuation of fluorescence by tissue.
Fig. 4: Lymphatic tracing using superparamagnetic iron oxide nanoparticles.
Fig. 5: Radioguided surgery after injection of 99mTc-labelled PSMA tracer in a patient with recurrent prostate cancer.
Fig. 6: The relationship between the size of lymphatic metastases and the most valuable imaging approach clinically.
Fig. 7: Multiparametric imaging solutions are needed to cover the complexity encountered in the surgical setting.

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Acknowledgements

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Nature Reviews Urology thanks B. Brown, A. Green and the other anonymous reviewer(s), for their contribution to the peer review of this work.

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F.W.B.v.L., A.W., H.G.v.D.P., M.E., F.W. and T.M. researched data for the article. F.W.B.v.L., A.W., H.G.v.D.P. and T.M. wrote the manuscript. All authors made a substantial contribution to discussions of content and edited the manuscript before submission.

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Correspondence to Fijs W. B. van Leeuwen.

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van Leeuwen, F.W.B., Winter, A., van Der Poel, H.G. et al. Technologies for image-guided surgery for managing lymphatic metastases in prostate cancer. Nat Rev Urol 16, 159–171 (2019). https://doi.org/10.1038/s41585-018-0140-8

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