Association between incident cancer and subsequent stroke.

Area of Science:

• Oncology
• Cardiovascular Epidemiology
• Public Health

Background:

• Cancer diagnosis is a significant health event with potential systemic implications.
• Understanding the link between cancer and secondary health risks like stroke is crucial for patient management.

Purpose of the Study:

• To investigate the association between incident cancer diagnoses and the subsequent risk of stroke.
• To quantify the short-term and long-term stroke risk in cancer patients compared to matched controls.

Main Methods:

• Utilized the Surveillance, Epidemiology, and End Results-Medicare linked database (2001-2009).
• Matched patients with new primary diagnoses of breast, colorectal, lung, pancreatic, or prostate cancer to cancer-free controls.
• Calculated cumulative incidence rates of stroke using competing risk survival statistics.

Main Results:

• The 3-month cumulative incidence of stroke was higher in cancer patients across most cancer types studied.
• Significantly elevated stroke risk was observed in lung (5.1%), pancreatic (3.4%), and colorectal (3.3%) cancer patients compared to controls.
• The excess stroke risk associated with cancer attenuated over time, typically disappearing beyond one year post-diagnosis.

Conclusions:

• Incident cancer is associated with an increased short-term risk of stroke.
• Lung, pancreatic, and colorectal cancers demonstrate the highest associated short-term stroke risk.
• The heightened stroke risk is transient, diminishing substantially after the first year.