A Research Study Looking at How NNC0385-0434 Tablets Work to Lower Blood Cholesterol in People With Heart Disease or a High Risk of Heart Disease

This study looks at how well a new medicine, NNC0385-0434, works to lower blood cholesterol levels. Participants will either get NNC0385-0434 as a tablet (a potential new medicine), or placebo as a tablet (a dummy medicine that looks like NNC0385-0434 but has no effect on the body), or evolocumab as an injection (a medicine that doctors can already prescribe). Which treatment participants get is decided by chance. If participants get NNC0385-0434 or placebo participants will need to take 1 tablet every morning. If participants get evolocumab participants will need to take 1 injection every 2 weeks. The study will last for about 22 weeks. About 255 people will participate in the study. Participants will have 9 visits to the clinic and 2 phone calls with the study doctor. Some people will be invited to participate in a sub-study and will have 4 extra visits (13 visits in total). Participants will have blood samples taken at all visits to the clinic (except visit 0). At 4 clinic visits, participants will have an electrocardiogram (ECG). This is a test to check your heart. Women can only take part in the study if they are not able to become pregnant.