A Study to Explore the Routes of Elimination of MDV3100

A Phase I Open-label Study to Investigate the Mass Balance and Biotransformation of a Single Oral 160 mg (100 µCi) Dose of 14C-MDV3100 (ASP9785) in Healthy Male Subjects

A study to investigate the excretion routes of radio-labelled MDV3100.

Inclusion Criteria:

• Body Mass Index within 18.5 to 30.0kg/m2
• Regular defecation pattern (minimum once per 2 days).
• Subject must be non-fertile, i.e., surgically sterilized or must practice an adequate contraceptive method to prevent pregnancies as defined in the protocol.

Exclusion Criteria:

• Known or suspected hypersensitivity to MDV3100, or any components of the formulation used.
• Any of the liver function tests above the upper limit of normal. A retest to confirm the result may be performed once.
• Any clinically significant history of asthma, eczema, any other allergic condition or previous severe hypersensitivity to any drug (excluding non-active hay fever).
• Abnormal pulse and/or blood pressure measurements at the pre-study visit as follows: Pulse <40 or >90 bpm; mean systolic blood pressure >140 mmHg ; mean diastolic blood pressure >90 mmHg (blood pressure measurements taken in triplicate after subject has been resting in supine position for 5 min; pulse will be measured automatically).
• A QTc interval of > 430 ms after repeated measurements (consistently after duplicate measurements), a history of unexplained syncope, cardiac arrest, unexplained cardiac arrhythmias or torsades de pointes, structural heart disease, or a family history of Long QT Syndrome (LQTS).
• Use of any prescribed or OTC (over-the-counter) drugs (including vitamins, natural and herbal remedies, e.g. St. John's wort) in the 2 weeks prior to admission to the Clinical Unit, except for occasional use of paracetamol (up to 3 g/day).
• Regular use of any inducer of metabolism (e.g., barbiturates, rifampin) in the 3 months prior to admission to the Clinical Unit.
• Positive serology test for HBsAg, anti HAV (IgM), anti-HCV or anti-HIV 1+2.
• Exposure to radiation for diagnostic reasons (except dental X-rays and plain X-rays of thorax and bony skeleton (excluding spinal column)), during work or during participation in a clinical study in the previous year.