Risks of therapy include death, myocardial infarction, stroke, venous thromboembolism, and tumor recurrence. This increases the likelihood of cyst recurrence. Tertiary prevention includes treatments to prevent the recurrence of liver cancer. There is no consensus on risk factors for recurrence of the disease. Episodes of alopecia areata before puberty predispose to chronic recurrence of the condition. That difference translates to a 120% increase in the risk of breast cancer recurrence. Postsurgical recurrence of Crohn's disease is relatively common. However, two markers were found that can help predict the risk of recurrence. Restenosis is the recurrence of stenosis after a procedure. Treating a recurrence detected by CA-125 does not improve survival. During filming of the show he had a recurrence of cancer. Co-trimoxazole decreases the risk of recurrence of retinochoroiditis. O'Toole retired from acting in July 2012 due to a recurrence of stomach cancer. Many organizations wait for losses to occur before taking steps to prevent a recurrence. CTA scans are repeated to monitor for recurrence.