The BBC NewsA third of the population have genes that could help them in the fight against heart disease, say scientists.
A study of 147,000 patients suggests that certain types of the CETP gene might increase the levels of so-called "good" cholesterol.
UK and Dutch research, published in the Journal of the American Heart Association, found a 5% cut in heart attacks for those with the key types.
A UK geneticist said it could point to drugs which help many more people.
Scientists already know that cutting the levels of "bad" cholesterol in the bloodstream protects your heart, and well-established drugs such as statins aim to do precisely this.
The relationship between the levels of "good", or HDL, cholesterol, and heart health are less clear, although there is some evidence that raising these levels is good for you.
The team from Cambridge and Newcastle universities, and the University of Groningen in the Netherlands, merged the results of almost 100 other studies, involving 147,000 people worldwide.
They looked for the effect of having one of six different variations of the CETP gene.
The most popular three all seemed to carry a modest positive effect, raising HDL cholesterol levels by between 3% and 5%, and people with them were less likely to have a heart attack.
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