The greater the number of samples and the more information that biobanks contain, the better they are as resources. However, more data often means more ethical issues to weigh.
"How do you get lots of people included in these and get lots of data while at the same time essentially protecting those people's privacy and also those people's presumed option to opt in or out?" asks Duke University's Robert Mitchell. "This is something that every biobank is struggling with," he adds.