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Until November 2018, I¡¯d never been hospitalized before. So, the suddenness of my lung cancer diagnosis at age 65 that year caught me completely off-guard.

I¡¯d had a persistent cough for several months. But I felt it was allergy- or acid reflux-related, so I wasn¡¯t overly concerned. Then I started having trouble climbing the stairs in my Dallas home. I didn¡¯t have much energy, and I was losing weight. The rapid decline in my health...