A Study to Evaluate the Effect of ASP1707 on the Bodies of Healthy Male Subjects After a Single Dose of Radioactive ASP1707

An Open Label Study to Evaluate the Pharmacokinetics of ASP1707 After a Single Oral Dose of 14C-labeled ASP1707 in Healthy Male Subjects

Subjects receive a single oral dose of radioactive ASP1707 on Day 1. Blood, plasma, urine and feces samples are collected for analysis of 14C-radioactivity and ASP1707. Metabolites are collected until at least 144 hours after dosing.

Subjects are admitted to the clinic on Day -1 and receive a single oral dose of 14C-labeled ASP1707 on Day 1. They remain in the clinic for 6 days and are discharged on Day 7 if sufficient recovery of administered radioactivity is achieved, or the total excretion (urine + feces) per 24 hours is less than 1% of the administered dose during 2 consecutive 24-hour intervals. If these conditions are not met, the residential period may be prolonged for a maximum of 3 days. If after this time one of the conditions is still not met, subjects are requested to continue collecting their urine and/or feces at home for another 2 days. If after these additional 2 days one of the conditions is still not met, the condition of recovery of radioactivity is disregarded. Therefore only the total excretion condition is to be met by collecting 24-hour intervals for urine and feces once a week for up to 2 weeks. If the excretion condition is still not met after this time, no further samples are collected and the subject is discharged from the study.

Inclusion Criteria:

• Subjects must be surgically sterilized and use condoms or must practice an effective contraceptive method to prevent pregnancies.
• Body Mass Index more than or equal to 18.5 and less than 30.0 kg/m2.
• Regular defecation pattern (minimum once per day).

Exclusion Criteria:

• Any of the liver function tests above the upper limit of normal.
• 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.
• Any use of drugs of abuse within 3 months prior to admission to the Clinical Unit.
• History of smoking more than 10 cigarettes (or equivalent amount of tobacco) per day within 3 months prior to admission to the Clinical Unit.
• Donation of blood or blood products within 3 months prior to admission to the Clinical Unit.
• Positive serology test for Hepatitis B Surface Antigen (HBsAg), anti Hepatitis A Virus (HAV) Immunoglobulin M (IgM), anti Hepatitis C Virus (HCV) or anti Human Immunodeficiency Virus (HIV) 1+2.