The aim of the study was to investigate the metabolism and pharmacokinetics of BIBW 2992 MA2 after a single oral dose of [14C]-radiolabelled BIBW 2992 MA2 in healthy male volunteers. Metabolites in human plasma and excretions were measured, the structures of the metabolites analysed and compared with metabolites in animals. In addition, the mass-balance of excretion, the protein binding of [14C]-radioactivity, the plasma concentrations of BIBW 2992 MA2, and the [14C]-radioactivity in blood cells, plasma, urine and faeces were measured. The safety and tolerability of BIBW 2992 were also investigated.

Inclusion Criteria:

• Healthy male subjects as determined by results of screening
• Signed written informed consent in accordance with Good Clinical Practice and local legislation
• Age ≥35 and ≤60 years
• Body Mass Index ≥18.5 kg/m2 and ≤29.9 kg/m2

Exclusion Criteria:

• Any finding of the medical examination (including blood pressure, pulse rate and ECG) deviating from normal and of clinical relevance
• History or current gastrointestinal, hepatic, renal, respiratory, cardiovascular, metabolic, immunologic, hormonal disorders
• History of any major surgery within the last four weeks before participation in this study or any bone fracture within the last two months
• History of orthostatic hypotension, fainting spells and blackouts
• Diseases of the central nervous system (such as epilepsy) or psychiatric disorders
• Chronic or relevant acute infections
• History of allergy/hypersensitivity (including drug allergy) which is deemed relevant to the trial as judged by the investigator
• Intake of drugs with a long half-life (> 24 hours) within 1 month prior to administration
• Planned use of any drugs which might influence the results of the trial within 10 days prior to administration or during the trial
• Participation in another trial with an investigational drug within 2 months prior to administration or during trial
• Smoker (> 10 cigarettes or 3 cigars or 3 pipes/day) or inability to refrain from smoking on study days
• Alcohol abuse (> 60 g/day)
• Drug abuse
• Blood donation within 1 month prior to administration or during the trial
• Excessive physical activities within 5 days prior to administration or during the trial
• Any laboratory value outside the reference range, unless considered to lack clinical reference
• Male subjects must agree to minimize the risk of female partners becoming pregnant from the dosing day until 3 months after the completion of the study. Acceptable methods of contraception for male volunteers include a vasectomy no less than 3 months prior to dosing, barrier contraception or a medically accepted contraceptive method. For female partners of male volunteers, acceptable methods of contraception include intra-uterine device, tubal ligation, hormonal contraceptive since at least two months and diaphragm with spermicide