This Week in PNAS

In the early, online version of the Proceedings of the National Academy of Sciences, a University of California, Los Angeles-led team describe proteolytic enzymes secreted by circulating tumor cells (CTCs). Using a microfluidics-based approach, the researchers isolated cells from cancer cell lines and CTCs from seven individuals with metastatic, castration-resistant prostate cancer to quantify levels of metalloprotease enzyme activity.

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Researchers describe a way to share data while keeping it secure, Agence France Presse reports.

In Science this week: genetic mutations typically associated with esophageal cancer are common in older, healthy individuals, and more.

India's Council of Scientific and Industrial Research has a new director-general, according to ScienceInsider.

A new study links more than a hundred genes to autism spectrum disorder, Discover's D-brief blog reports.