17.9% of cancer survivors experienced anxiety as opposed to 13.9% of healthy controls.
Mitchell, Alex, David Ferguson, John Gill, Jim Paul, Paul Symonds. Depression and Anxiety in Long-Term Cancer Survivors Compared with Spouses and Healthy Controls: A systematic review and meta-analysis. Lancet Oncol. 2013; 14(8): 721-32. http://www.thelancet.com/journals/lanonc/article/PIIS1470-2045(13)70244-4/abstract