They volunteered to provide genetic samples for research and to be listed in a publicly accessible database, based on assurances that their names would not be linked to the samples.
But nearly 50 people who had anonymously participated in studies were identified by a team of Cambridge scientists using Internet searches and genealogy websites to discern their names, demonstrating that like credit card and bank account numbers, genetic information is vulnerable to hacking.
Source: Boston Globe. Read full article. (link)