This Week in PNAS

In the early, online edition of the Proceedings of the National Academy of Sciences, the Chinese University of Hong Kong's Dennis Lo and colleagues present findings from a bisulfite sequencing study of DNA circulating in the blood that revealed lower-than-usual methylation in individuals with the liver cancer hepatocellular carcinoma and other cancer types.

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CNN reports that researchers have tied a new variant to opioid addiction risk.

Organoids derived from patients' tumors may help determine what chemotherapy treatment patients would benefit from, according to New Scientist.

An initiative from GenomeAsia 100K hopes to increase the number of South Asians in genetic research, according to NBC News.

In Science this week: genomic analysis of ancient and modern horses indicates population turnover, and more.