Thomas W Gaither1, Mohannad A Awad2, E Charles Osterberg3, Gregory P Murphy1, Isabel E Allen4, Albert Chang5, Raymond C Rosen6, Benjamin N Breyer7. 1. Department of Urology, University of California-San Francisco, San Francisco, CA, USA. 2. Department of Urology, University of California-San Francisco, San Francisco, CA, USA; Department of Surgery, King Abdul Aziz University, Rabigh, Saudi Arabia. 3. Department of Surgery, University of Texas-Dell Medical School, Austin, TX, USA. 4. Department of Epidemiology and Biostatistics, University of California-San Francisco, San Francisco, CA, USA. 5. Department of Radiation Oncology, University of California-San Francisco, San Francisco, CA, USA. 6. New England Research Institutes, Inc, Watertown, MA, USA. 7. Department of Urology, University of California-San Francisco, San Francisco, CA, USA; Department of Epidemiology and Biostatistics, University of California-San Francisco, San Francisco, CA, USA. Electronic address: benjamin.breyer@urology.ucsf.edu.
Abstract
BACKGROUND: Erectile dysfunction (ED) after treatment for prostate cancer with radiotherapy (RT) is well known, and pooled estimates of ED after RT will provide more accurate patient education. AIM: To systematically evaluate the natural history of ED in men with previous erectile function after prostate RT and to determine clinical factors associated with ED. METHODS: We performed a review of the PubMed and Medline, Embase, Cochrane Library, and Web of Science databases in April 2016 according to the Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) statement. Identified reports included a measurement of ED before and after prostate RT. Two hundred seventy-eight abstracts were screened and 105 publications met the criteria for inclusion. Only men with known erectile function before RT were included in the analysis. OUTCOME: ED after RT of the prostate. RESULTS: In total, 17,057 men underwent brachytherapy (65%), 8,166 men underwent external-beam RT (31%), and 1,046 men underwent both (4%). Seven common instruments were used to measure ED, including 23 different cutoffs for ED. The Sexual Health Inventory for Men (SHIM) was used in 31 studies (30%). Pooled estimates of SHIM-confirmed ED (score <10-17) suggested the prevalence of ED after RT is 34% of men (95% CI = 0.29-0.39) at 1 year and 57% (95% CI = 0.53-0.61) at 5.5 years. Compared with brachytherapy, studies of the two types of radiation increased the proportion of new-onset ED found by 12.3% of studies (95% CI = 2.3-22.4). For every 10% who were lost to follow-up, the proportion of ED reported increased by 2.3% (95% CI = 0.03-4.7). CLINICAL IMPLICATIONS: ED is common regardless of RT modality and increases during each year of follow-up. Using the SHIM, ED is found in approximately 50% patients at 5 years. STRENGTHS AND LIMITATIONS: The strengths of this systematic review include strict inclusion criteria of studies that measured baseline erectile function, no evidence for large effect size bias, and a large number of studies, which allow for modeling techniques. However, all data included in this analysis were observational, which leaves the possibility that residual confounding factors increase the rates of ED. CONCLUSION: Definitions and measurements of ED after RT vary considerably in published series and could account for variability in the prevalence of reported ED. Loss to follow-up in studies could bias the results to overestimate ED. Gaither TW, Awad MA, Osterberg EC, et al. The Natural History of Erectile Dysfunction After Prostatic Radiotherapy: A Systematic Review and Meta-Analysis. J Sex Med 2017;14:1071-1078.
BACKGROUND:Erectile dysfunction (ED) after treatment for prostate cancer with radiotherapy (RT) is well known, and pooled estimates of ED after RT will provide more accurate patient education. AIM: To systematically evaluate the natural history of ED in men with previous erectile function after prostate RT and to determine clinical factors associated with ED. METHODS: We performed a review of the PubMed and Medline, Embase, Cochrane Library, and Web of Science databases in April 2016 according to the Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) statement. Identified reports included a measurement of ED before and after prostate RT. Two hundred seventy-eight abstracts were screened and 105 publications met the criteria for inclusion. Only men with known erectile function before RT were included in the analysis. OUTCOME: ED after RT of the prostate. RESULTS: In total, 17,057 men underwent brachytherapy (65%), 8,166 men underwent external-beam RT (31%), and 1,046 men underwent both (4%). Seven common instruments were used to measure ED, including 23 different cutoffs for ED. The Sexual Health Inventory for Men (SHIM) was used in 31 studies (30%). Pooled estimates of SHIM-confirmed ED (score <10-17) suggested the prevalence of ED after RT is 34% of men (95% CI = 0.29-0.39) at 1 year and 57% (95% CI = 0.53-0.61) at 5.5 years. Compared with brachytherapy, studies of the two types of radiation increased the proportion of new-onset ED found by 12.3% of studies (95% CI = 2.3-22.4). For every 10% who were lost to follow-up, the proportion of ED reported increased by 2.3% (95% CI = 0.03-4.7). CLINICAL IMPLICATIONS: ED is common regardless of RT modality and increases during each year of follow-up. Using the SHIM, ED is found in approximately 50% patients at 5 years. STRENGTHS AND LIMITATIONS: The strengths of this systematic review include strict inclusion criteria of studies that measured baseline erectile function, no evidence for large effect size bias, and a large number of studies, which allow for modeling techniques. However, all data included in this analysis were observational, which leaves the possibility that residual confounding factors increase the rates of ED. CONCLUSION: Definitions and measurements of ED after RT vary considerably in published series and could account for variability in the prevalence of reported ED. Loss to follow-up in studies could bias the results to overestimate ED. Gaither TW, Awad MA, Osterberg EC, et al. The Natural History of Erectile Dysfunction After Prostatic Radiotherapy: A Systematic Review and Meta-Analysis. J Sex Med 2017;14:1071-1078.
Authors: Yiannis Philippou; Hanna T Sjoberg; Emma Murphy; Said Alyacoubi; Keaton I Jones; Alex N Gordon-Weeks; Su Phyu; Eileen E Parkes; W Gillies McKenna; Alastair D Lamb; Uzi Gileadi; Vincenzo Cerundolo; David A Scheiblin; Stephen J Lockett; David A Wink; Ian G Mills; Freddie C Hamdy; Ruth J Muschel; Richard J Bryant Journal: Br J Cancer Date: 2020-07-09 Impact factor: 7.640