A Study in Healthy Men to Find Out How BI 425809 is Taken up and Handled by the Body

Inclusion Criteria: * Healthy male subjects according to the investigator's assessment, based on a complete medical history including a physical examination, vital signs (BP, PR), 12-lead ECG, and clinical laboratory tests * Age of 18 to 65 years (incl.) * BMI of 18.5 to 29.9 kg/m2 (incl.) * Signed and dated written informed consent prior to admission to the study in accordance with GCP and local legislation * Subjects who are sexually active must use, with their partner, highly effective contraception from the time of administration of trial medication until 4 months after administration of trial medication. * Subjects are required to use condoms to prevent unintended exposure of the partner to the study drug via seminal fluid. Alternatively, true abstinence is acceptable when it is in line with the subject's preferred and usual lifestyle. If a subject is usually not sexually active but becomes active, with their partner, they must comply with the contraceptive requirements detailed above. Exclusion Criteria: * Any finding in the medical examination (including BP, PR or ECG) is deviating from normal and judged as clinically relevant by the investigator * Repeated measurement of systolic blood pressure outside the range of 90 to 139 mmHg, diastolic blood pressure outside the range of 45 to 89 mmHg, or pulse rate outside the range of 40 to 100 bpm * Any laboratory value outside the reference range that the investigator considers to be of clinical relevance * Any evidence of…