Breast cancer is the most common form of cancer in women. Hundreds of thousands of new cases are identified worldwide every year. Now, one of the largest cancer prevention studies of its kind has reported some sobering findings. Just one alcoholic drink a day can increase the risk of developing breast cancer. But, the researchers also found there are things people can do to reduce their risk. The American Institute for Cancer Research did the study. It examined 119 past studies involving 12 million women. 260,000 of them had breast cancer. Anne McTiernan was the lead writer of the report. McTiernan is with the Fred Hutchinson Cancer Research Center in Seattle, Washington. She said the research showed a connection between drinking alcohol and increased risk of breast cancer in 10 studies involving 4,000 women. The women were of childbearing age and had developed breast cancer. The study found that the women who drank about 10 grams of alcohol a day had a five percent increased risk of breast cancer.