Mass Balance Recovery and Metabolite Identification of Carbon-14 BIA 28-6156

The study is designed to determine the absorption, distribution, metabolism and elimination (ADME) of BIA 28-6156 in humans, further explore the PK of BIA 28-6156, evaluate the extent of distribution of total radioactivity into blood cells, provide additional safety and tolerability information and collect samples for metabolite profiling and structural identification.

This is an open-label, single-dose, single period study in healthy male subjects. It is planned to enroll 6 subjects. All subjects will receive a single oral dose Carbon-14 BIA 28-6156. Blood samples will be collected at regular intervals for PK analysis, mass balance and metabolite profiling and identification from pre-dose up to 240 h post-dose. Urine and faecal samples will be collected at regular intervals for mass balance and metabolite profiling and identification from pre-dose until the mass balance criteria have been met.

Eligibility Criteria:
Inclusion Criteria:

* Healthy males aged 30 to 65 years inclusive
* Body mass index (BMI) of 18.0 to 35.0 kg/m2
* Must be willing and able to communicate and participate in the whole study
* Must have regular bowel movements
* Must provide written informed consent
* Must agree to adhere to contraception requirements

Exclusion Criteria:

* Subjects who have received any IMP in a clinical research study within the 90 days prior to Day 1
* Subjects who are, or are immediate family members of, a study site or sponsor employee
* Evidence of current SARS-CoV-2 infection from results of diagnostic tests or from symptoms reported at screening or admission
* History of any drug or alcohol abuse in the past 2 years
* Regular alcohol consumption
* A confirmed positive alcohol breath test at screening or admission
* Current smokers and those who have smoked within the last 12 months.
* Current users of e-cigarettes and nicotine replacement products and those who have used these products within the last 12 months
* Subjects with pregnant or lactating partners
* Radiation exposure, including that from the present study, excluding background radiation but including diagnostic x-rays and other medical exposures, exceeding 5 mSv in the last 12 months or 10 mSv in the last 5 years.
* Subjects who do not have suitable veins for multiple venepunctures/cannulation
* Clinically significant abnormal clinical chemistry, haematology or urinalysis. Subjects with Gilbert's Syndrome are allowed.
* Confirmed positive drugs of abuse test result
* Positive hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (HCV Ab) or human immunodeficiency virus (HIV) antibody results
* Evidence of renal impairment at screening, as indicated by an estimated creatinine clearance (CLcr) of \<80 mL/min using the Cockcroft-Gault equation
* History of clinically significant cardiovascular, renal, hepatic, dermatological, chronic respiratory or gastrointestinal disease, neurological or psychiatric disorder
* Serious adverse reaction or serious hypersensitivity to any drug or the formulation excipients
* Presence or history of clinically significant allergy requiring treatment. Hay fever is allowed unless it is active
* Donation of blood or plasma within the previous 3 months or loss of greater than 400 mL of blood
* Subjects who are taking, or have taken, any prescribed or over-the-counter drug or herbal remedies (other than up to 4 g of paracetamol per day) in the 14 days before IMP administration.
* Failure to satisfy the investigator of fitness to participate for any other reason