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A Study to Assess the Efficacy of Tadalafil to Treat Erectile Dysfunction After Radiotherapy of Prostate Cancer

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00122499
Recruitment Status : Completed
First Posted : July 22, 2005
Last Update Posted : July 27, 2005
Information provided by:
Erasmus Medical Center

Brief Summary:
This study has been designed to evaluate the efficacy and safety of a 20-mg dose of tadalafil administered "on demand" to patients with erectile dysfunction (ED) after external-beam radiotherapy (EBRT) of prostate cancer.

Condition or disease Intervention/treatment Phase
Prostate Cancer Erectile Dysfunction Drug: tadalafil Phase 3

Detailed Description:
Prostate cancer has become the most frequent malignancy in older men in Western countries. Radiotherapy is a common treatment modality for early stage prostate cancer. Because of the high incidence of post-radiation erectile dysfunction (ED), up to 72% after external-beam radiotherapy, this patient category represents a most difficult therapeutic challenge. Oral drug therapy represents the first-line management option for patients with ED. The results of the studies completed thus far with sildenafil show that a phosphodiesterase type 5 inhibitor is a safe and efficacious drug for the treatment of post-radiation ED. No studies have investigated the efficacy of tadalafil in men complaining of ED after radiotherapy of prostate cancer. Because of the extended period of effectiveness, which may last up to 36 hours after intake, tadalafil allows freedom in the choice for time of sexual activity. Also the absence of restrictions of tadalafil intake with food or alcohol should simplify its administration. This randomized, double-blind, placebo-controlled, cross-over study has been designed to evaluate the efficacy and safety of "on demand" dosing of 20-mg of tadalafil or placebo administered for 12 weeks to patients with ED after external-beam radiotherapy for prostate cancer.

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Study Type : Interventional  (Clinical Trial)
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double
Primary Purpose: Treatment
Official Title: A Study to Assess the Efficacy of Tadalafil to Treat Erectile Dysfunction After Radiotherapy of Prostate Cancer
Study Start Date : February 2003
Study Completion Date : February 2005

Resource links provided by the National Library of Medicine

Drug Information available for: Tadalafil

Primary Outcome Measures :
  1. To evaluate the efficacy of 20 mg tadalafil, in comparison with placebo, in men with ED after 3-D conformal radiotherapy (3DCRT) of prostate cancer

Secondary Outcome Measures :
  1. Responses to the Global Assessment Questions (GAQ), and the other items of the Sexual Encounter Profile (SEP) and International Index of Erectile Function (IIEF)
  2. To assess the side effects of 20 mg tadalafil in men with ED after 3DCRT

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Heterosexual men, at least 18 years of age at Visit 1 and willing to participate in the study. If a qualifying participant has more than one female sexual partner during the study, the participant will not be excluded from the trial. However, the participant will be required to respond to the questionnaires based on the participant's sexual interactions with only one of these partners.
  • Patients with histologically proven prostate cancer.
  • Provide signed informed consent.
  • Developed ED (defined as a consistent change in the quality of erection that adversely affects the patient's satisfaction with sexual intercourse) subsequent to EBRT for prostate cancer.
  • Patients willing to make on average 1 sexual intercourse attempt every week during the study (including the 4-week run-in period without medication).
  • Agree not to use any other ED treatment for at least 4 weeks before receiving the initial dose of study drug (ie, during the run-in period and during the treatment phase of the study).
  • Have been treated by EBRT at least 12 months before screening and were documented to be potent before undergoing EBRT.

Exclusion Criteria:

  • Patients will not be randomized if they did not make at least 1 sexual intercourse attempt during the run-in period. Also patients who are unable to appropriately complete the questionnaires will not be randomized.
  • ED caused by other primary sexual disorders including premature ejaculation or ED caused by untreated endocrine disease (eg, hypopituitarism, hypothyroidism, or hypogonadism).
  • History of pelvic surgery (including radical prostatectomy)
  • Treatment with cancer chemotherapy or anti-androgens.
  • Have a raising prostate specific antigen level or metastases at Visit 1.
  • History of penile implant.
  • The presence of clinically significant penile deformity in the opinion of the investigator.
  • Evidence of clinically significant renal insufficiency within the last 6 months before Visit 1.
  • Active symptomatic hepatobiliary disease, including patients with evidence of jaundice at Visit 1.
  • Patients with chronic stable angina treated with long-acting nitrates, or patients with chronic stable angina who have required short-acting nitrates in the last 90 days, or angina occurring during sexual intercourse in the last 6 months.
  • Patients having met the criteria for unstable angina (Braunwald, 1989) within 6 months before Visit 1, history of myocardial infarction or coronary artery bypass graft surgery within 90 days before Visit 1, or percutaneous coronary intervention (eg, angioplasty or stent placement) within 90 days before Visit 1.
  • Any supraventricular arrhythmia with an uncontrolled ventricular response (mean heart rate >100 bpm) at rest despite medical or device therapy, or any history of spontaneous or induced sustained ventricular tachycardia (heart rate >100 bpm for ≥ 30 sec) despite medical or device therapy, or the presence of an automatic internal cardioverter-defibrillator.
  • A history of sudden cardiac arrest despite medical or device therapy.
  • Any evidence of congestive heart failure class 2 or above within 6 months before Visit 1 (Criteria Committee, New York Heart Association, Inc., 1964).
  • A new, significant conduction defect within 90 days before Visit 1.
  • Systolic blood pressure >170 or <90 mm Hg or diastolic blood pressure >100 or <50 mm Hg, or patients with a history of malignant hypertension.
  • History of significant central nervous system injuries (including stroke and spinal cord injury) within the 6 months before Visit 1.
  • History of HIV infection.
  • Any condition that would interfere with the patient's ability to provide informed consent or comply with study instructions, would place patient at increased risk, or might confound the interpretation of the study results.
  • History of drug, alcohol, or substance abuse within the 6 months before Visit 1.
  • Treatment within the 30 days before Visit 1 with a drug or device that has not received regulatory approval.
  • Have any condition, limitation, or disease that could, in the judgment of the investigator, preclude evaluation of response to tadalafil.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00122499

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Erasmus MC
Rotterdam, Netherlands, 3008 AE
Sponsors and Collaborators
Erasmus Medical Center
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Principal Investigator: Luca Incrocci, M.D., Ph.D. Erasmus MC
Layout table for additonal information Identifier: NCT00122499    
Other Study ID Numbers: 232.476/2003/180
First Posted: July 22, 2005    Key Record Dates
Last Update Posted: July 27, 2005
Last Verified: July 2005
Keywords provided by Erasmus Medical Center:
Prostate cancer
Erectile dysfunction
Additional relevant MeSH terms:
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Prostatic Neoplasms
Erectile Dysfunction
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Prostatic Diseases
Sexual Dysfunction, Physiological
Sexual Dysfunctions, Psychological
Mental Disorders
Vasodilator Agents
Phosphodiesterase 5 Inhibitors
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Urological Agents