External Beam Radiotherapy Affects Serum Testosterone in Patients … – UroToday
Posted: May 31, 2017 at 8:43 pm
Previous studies have examined testosterone levels after external beam radiation (EBRT) monotherapy, but since 2002 only sparse contemporary data have been reported.
To examine testosterone kinetics in a large series of contemporary patients after EBRT.
The study was conducted in 425 patients who underwent definitive EBRT for localized prostate cancer from 2002 through 2014. Patients were enrolled in several phase II and III trials. Exclusion criteria were neoadjuvant or adjuvant androgen-deprivation therapy or missing data. Testosterone was recorded at baseline and then according to each study protocol (not mandatory in all protocols). Statistical analyses consisted of means and proportions, Kaplan-Meier plots, and logistic and Cox regression analyses.
Testosterone kinetics after EBRT monotherapy and their influence on biochemical recurrence.
Median follow-up of 248 assessable patients was 72 months. One hundred eighty-six patients (75.0%) showed a decrease in testosterone. Median time to first decrease was 6.4 months. Median percentage of decrease to the nadir was 30% and 112 (45.2%) developed biochemical hypogonadism (serum testosterone < 8 nmol/L). Of all patients with testosterone decrease, 117 (62.9%) recovered to at least 90% of baseline levels. Advanced age, increased body mass index, higher baseline testosterone level, and lower nadir level were associated with a lower chance of testosterone recovery. Subgroup analyses of 166 patients treated with intensity-modulated radiotherapy confirmed the results recorded for the entire cohort. In survival analyses, neither testosterone decrease nor recovery was predictive for biochemical recurrence.
EBRT monotherapy influences testosterone kinetics, and although most patients will recover, approximately 45% will have biochemical hypogonadism.
We report on the largest contemporary series of patients treated with EBRT monotherapy in whom testosterone kinetics were ascertained. Limitations are that testosterone follow-up was not uniform and the study lacked information on health-related quality-of-life data.
Our findings indicate that up to 75% of patients will have a profound testosterone decrease, with up to a 40% increase in rates of biochemical hypogonadism, although the latter events will leave biochemical recurrence unaffected. Pompe RS, Karakrewicz PI, Zaffuto E, etal. External Beam Radiotherapy Affects Serum Testosterone in Patients With Localized Prostate Cancer. J Sex Med 2017;XX:XXX-XXX.
The journal of sexual medicine. 2017 May 22 [Epub ahead of print]
Raisa S Pompe, Pierre I Karakiewicz, Emanuele Zaffuto, Ariane Smith, Marco Bandini, Michele Marchioni, Zhe Tian, Sami-Ramzi Leyh-Bannurah, Jonas Schiffmann, Guila Delouya, Carole Lambert, Jean-Paul Bahary, Marie Claude Beauchemin, Maroie Barkati, Cynthia Mnard, Markus Graefen, Fred Saad, Derya Tilki, Daniel Taussky
Cancer Prognostics and Health Outcomes Unit, University of Montreal Health Center, Montreal, Canada; Martini Clinic, Prostate Cancer Center, University Hospital Hamburg-Eppendorf, Hamburg, Germany. Electronic address: ., Cancer Prognostics and Health Outcomes Unit, University of Montreal Health Center, Montreal, Canada; Department of Urology, University of Montreal Health Center, Montreal, Canada., Cancer Prognostics and Health Outcomes Unit, University of Montreal Health Center, Montreal, Canada; Department of Urology and Division of Experimental Oncology, Urological Research Institute, IRCCS San Raffaele Scientific Institute, Milan, Italy., Department of Urology, University of Montreal Health Center, Montreal, Canada., Cancer Prognostics and Health Outcomes Unit, University of Montreal Health Center, Montreal, Canada; Department of Urology, SS Annunziata Hospital, G.D. Annunzio University of Chieti, Chieti, Italy., Cancer Prognostics and Health Outcomes Unit, University of Montreal Health Center, Montreal, Canada., Cancer Prognostics and Health Outcomes Unit, University of Montreal Health Center, Montreal, Canada; Martini Clinic, Prostate Cancer Center, University Hospital Hamburg-Eppendorf, Hamburg, Germany; Department of Urology, University Hospital Hamburg-Eppendorf, Hamburg, Germany., Department of Urology, Academic Hospital Braunschweig, Braunschweig, Germany., Department of Radiation Oncology, University of Montreal Health Center, Montreal, Canada., Martini Clinic, Prostate Cancer Center, University Hospital Hamburg-Eppendorf, Hamburg, Germany., Martini Clinic, Prostate Cancer Center, University Hospital Hamburg-Eppendorf, Hamburg, Germany; Department of Urology, University Hospital Hamburg-Eppendorf, Hamburg, Germany.
PubMed http://www.ncbi.nlm.nih.gov/pubmed/28546065
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