This Week in PNAS

In a study appearing online this week in the Proceedings of the National Academy of Sciences, researchers from the US and Brazil demonstrate the feasibility of finding cell-free DNA in the cerebrospinal fluid that stems from tumors in the brain or spinal cord. The team started by using targeted sequencing and/or exome sequencing to find cancer-specific mutations in tumor samples from 35 individuals with primary gliomas or medulloblastomas.

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The New York Times and ProPublica look into the close relationship between a startup and Memorial Sloan Kettering Cancer Center.

Yahoo News reports millions of dollars are being transferred from NIH, CDC, and other programs to pay for the housing of detained undocumented immigrant children.

In Science this week: in vitro generation of human reproductive cells, and more.

Researchers gave a handful of octopuses MDMA to find that they too act more social on the drug, Gizmodo reports.