conference reporter

AUA2021

The Future of Urologic Oncology: Treatment Advances Spur Discussion

by Joseph A. Smith Jr, MD

Overview

The optimal use of ablative therapies for prostate cancer is an evolving area that promises to influence the future of urologic oncology. Speakers presented points and counterpoints in a plenary session at AUA2021 titled “Crossfire: Controversies in Urology Debate: Can Focal Therapy Replace Prostatectomy in a Man With a Localized, Clinically Significant Lesion and a Negative Standard Biopsy.”

Following this session, featured expert Joseph A. Smith Jr, MD, was interviewed by Conference Reporter Editor-in-Chief Tom Iarocci, MD, and Dr Smith’s perspectives are presented here.

Joseph A. Smith Jr, MD

William L. Bray Professor
Department of Urology
Vanderbilt University
Nashville, TN

“The main issues with the use of focal therapy revolve around the identification of focal disease and, more importantly, the definition of  treatment success.”

Joseph A. Smith Jr, MD

The primary appeal of focal therapy is the lower risk of treatment-related complications compared with the complications experienced with whole-gland therapy. The fact that focal therapy has better functional results is not in dispute; subjecting only a portion of the prostate and periprostatic tissue to the potential harms of treatment has less overall impact on function than whole-gland therapy. Likewise, the ability to deliver ablative energy is also not in dispute, whether using high-intensity–focused ultrasound, cryotherapy, or focal laser ablation.

The main issues with the use of focal therapy revolve around the identification of focal disease and, more importantly, the definition of treatment success. Most prostate cancers are multifocal, with disease occurring throughout the prostate, although there are some patients who have an index lesion (ie, where the largest or highest-grade cancer is focal) and others who have only a single area of disease. While magnetic resonance imaging (MRI) is extremely useful for making that assessment, it is not completely accurate. Thus, focal therapy always runs the risk of undertreatment by missing areas of the disease. 

The other important issue is related to determining treatment success. Since you are not treating the entire prostate, you cannot expect the prostate-specific antigen (PSA) to become undetectable. The lower the PSA level goes, the better; however; the effect also depends on how much of the prostate was treated. Some have suggested that the PSA should, ideally, go down to less than 1 ng/mL, but that may be an unrealistic threshold for a patient who still has a sizable amount of untreated prostate tissue. 

While guidelines recommend that patients have follow-up biopsies to determine whether the focal therapy was successful, that has not been the standard in many published studies. Although patients are often understandably reluctant to have additional biopsies, follow-up biopsies should be standard practice in both the treated and untreated portions of the prostate because we know that simply following the PSA is not sufficient to recognize treatment failure. 

During this AUA2021 session, the speakers discussed the case of a middle-aged man with a PSA of 7 ng/mL, a stage T2a lesion, and a Prostate Imaging Reporting and Data System 4 lesion on MRI; important considerations were brought to the fore. Regarding the selection of patients for focal therapy, one issue that speaker Peter R. Carroll, MD, MPH, alluded to is that, unfortunately, patients who are probably better treated with active surveillance may be offered focal therapy, with the appeal based on the low morbidity and the low risk of functional side effects. 

I think that low- and very low-risk prostate cancer is best managed with active surveillance rather than with focal therapy. As part of a multimodal approach, focal therapy has the biggest potential role in the treatment of patients with small, favorable, intermediate-risk cancers that are localized to an MRI index lesion; those who are less ideal candidates for active surveillance; and those who do not want to be subjected to the potential morbidity of whole-gland therapy. However, the use of focal therapy in an effort to preserve erectile function is a double-edged sword. The preservation of erectile function may be hampered in a patient who fails focal therapy compared with a patient who uses surgery as a primary treatment. This is because it is difficult—and likely not even advisable—to perform nerve-sparing procedures on the side where focal therapy was performed.

References

Abreu AL, Peretsman S, Iwata A, et al. High intensity focused ultrasound hemigland ablation for prostate cancer: initial outcomes of a United States series. J Urol. 2020;204(4):741-747. doi:10.1097/JU.0000000000001126

Chao B, Lepor H. 5-year outcomes following focal laser ablation of prostate cancer. Urology. 2021;155:124-129. doi:10.1016/j.urology.2021.03.054

Gontero P, Marra G, Teber D, et al. Making a case “against” focal therapy for intermediate-risk prostate cancer. World J Urol. 2021;39(3):719-728. doi:10.1007/s00345-020-03303-y

Herrera-Caceres JO, Nason GJ, Salgado-Sanmamed N, et al. Salvage radical prostatectomy following focal therapy: functional and oncological outcomes. BJU Int. 2020;125(4):525-530. doi:10.1111/bju.14976

Huber PM, Afzal N, Arya M, et al. Prostate specific antigen criteria to diagnose failure of cancer control following focal therapy of nonmetastatic prostate cancer using high intensity focused ultrasound. J Urol. 2020;203(4):734-742. doi:10.1097/JU.0000000000000747

Kenigsberg AP, Llukani E, Deng F-M, Melamed J, Zhou M, Lepor H. The use of magnetic resonance imaging to predict oncological control among candidates for focal ablation of prostate cancer. Urology. 2018;112:121-125. doi:10.1016/j.urology.2017.10.014

Klotz L, Emberton M, Lepor H, Carroll PR, Abreu AL. Crossfire: controversies in urology debate: can focal therapy replace prostatectomy in a man with a localized, clinically significant lesion and a negative standard biopsy. Plenary session presented at: AUA2021; September 10-13, 2021.

Ramesh SBK, Moschovas M, Noel J, Reddy S, Rogers T, Patel V. Tips and tricks in salvage RALP post focal therapy failure for prostate cancer [abstract V12-10]. J Urol. 2021;206(suppl 3):e1027. doi:10.1097/JU.0000000000002093.10


This information is brought to you by Engage Health Media and is not sponsored, endorsed, or accredited by the American Urological Association.

More in Advanced Hormone-Sensitive Prostate Cancer

Thumb

Advanced Hormone-Sensitive Prostate Cancer

Conference Reporter in Advanced Hormone-Sensitive Prostate Cancer to Cover Key Topics Being Presented at AUA2021

Conference Reporter

Conference Reporter delivers health care providers with insights from key thought leaders on exciting news presented at major medical conferences, ...READ MORE

Thumb

Advanced Hormone-Sensitive Prostate Cancer

Guidelines From the Advanced Prostate Cancer Panel

Conference Reporter by Joseph A. Smith Jr, MD

During a plenary session at AUA2021, William T. Lowrance, MD, MPH, MBA, from the Huntsman Cancer Institute at the University of Utah, delivered a p...READ MORE

Thumb

Advanced Hormone-Sensitive Prostate Cancer

Controversies in Urology: Prostate Biopsy Best Practices

Conference Reporter by Peter R. Carroll, MD, MPH

Peter R. Carroll, MD, MPH, reflects on AUA2021 proceedings, commenting on current capabilities and best practices for performing prostate biopsies....READ MORE

More In Conference Reporter

Liver Fibrosis

Noninvasive Testing For Fatty Liver Disease And Its Different Phenotypes

Conference Reporter by Kris V. Kowdley, MD, FACP, FACG, AGAF, FAASLD

Liver Fibrosis

Multidisciplinary Care For Nonalcoholic Fatty Liver Disease

Conference Reporter by Kris V. Kowdley, MD, FACP, FACG, AGAF, FAASLD

Liver Fibrosis

The Gut Liver Axis And The Microbiome In Liver Inflammation And Fibrosis

Conference Reporter by Ashwani K. Singal, MD, MS, AGAF, FACG, FAASLD