A hospital-based cohort of 4,441 patients who had radical surgery for stage I-III gastric cancer in Zhejiang tracked deaths over a median 3.83 years. Each standard-deviation rise in modelled PM2.5 over the 36 months before surgery was associated with 15% higher all-cause mortality. Gastric cancer-specific mortality was 31% higher per standard deviation, although exposure was modelled from residential address rather than measured for each patient.
Why it is interesting: Air pollution here is a prognostic factor after diagnosis, not only a cause of disease.
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