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One of the world’s largest pharmaceutical companies has launched a massive effort to compile genome sequences and health records from two million people over the next decade. In doing so, AstraZeneca and its collaborators hope to unearth rare genetic sequences that are associated with disease and with responses to treatment.

It’s an unprecedented number of participants for this type of study, says Ruth March, vice-president and head of personalized health care and biomarkers at AstraZeneca, which is headquartered in London. “That’s necessary because we’re going to be looking for very rare differences among individuals.”

To achieve that ambitious goal, AstraZeneca will partner with research institutions including the Wellcome Trust Sanger Institute in Hinxton, UK, and Human Longevity, a biotechnology company founded in San Diego, California, by genomics pioneer Craig Venter. AstraZeneca also expects to draw on data from 500,000 participants in its own clinical trials, and medical samples that it has accrued over the past 15 years.

In doing so, AstraZeneca will be following a burgeoning trend in genetics research. For years, geneticists pursued common variations in human...