4 Recent epidemiological data also suggest an increasing trend in the incidence of lung cancer among never smokers, with ∼12.5% of cases observed in this demographic occurring among young adults. 5 Concurrently, sex disparities in cancer incidence among young adults have become increasingly pronounced, reflecting distinct evolving trends over time. 2 Historically, women under 50 years have carried a heavier cancer burden than men in the same age group, and this disparity has widened considerably over time.
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