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Researchers at the Harvard School of Public Health and their collaborators show in this week's PNAS Early Edition that "cigarette smoking increases copy number alterations in non-small cell lung cancer." The team reports results of a genome-wide study of DNA copy number and smoking pack-years on 264 NSCLC tumors, divided into discovery and validation sets. "We found that heavy cigarette smokers ([fewer than] 60 pack-years) have significantly more copy number gains than non- or light smokers ([more than or equal to] 60 pack-years) ...

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The Wall Street Journal reports on gaps in COVID-19 testing affecting less affluent urban areas and rural locations.

According to NBC News, new SARS-CoV-2 variants are making it harder for researchers to model the course of the pandemic.

The New York Times reports that experts say President Joe Biden's goal of vaccinating 1 million people a day in the US in the next 100 days is too low a bar.

In Science this week: single-cell lineage tracing technique applied to study lung cancer metastasis, and more.