Same data, two opposite conclusions? – unless…
When data from the Copehnhagen City Heart Study was published in 2013, they concluded that shorter telomeres in leukocytes was not associated with increased cancer after adjusting for age but that it WAS associated with reduced survival from cancer http://jnci.oxfordjournals.org/content/105/7/459.long
In 2015, the same data looked at certain gene tendencies that promote telomere shortening and concluded that cancer survival was IMPROVED when shortening was enhanced in the telomeres.
Contradiction? Not so fast.