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Immunity may play a role in preventing cancer progression. We studied associations of immune‐related conditions with cancer‐specific mortality among older adults in the United States. We evaluated 1 229 443 patients diagnosed with 20 common cancer types (age 67‐99, years 1993‐2013) using Surveillance Epidemiology and End Results‐Medicare data. With Medicare claims, we ascertained immune‐related medical...