Early Heart Changes Linked to Future Cancer Risk, UCLA Study Finds

Top Summary

• What happened: A UCLA-led study found that subtle structural and functional changes in the heart, known as cardiac remodeling, are associated with an increased future risk of breast and colorectal cancers.
• Why it matters: These findings suggest a shared biological pathway between cardiovascular disease and cancer, potentially allowing for earlier identification of at-risk individuals.
• What changes: Cardiac imaging markers, already used to identify people at risk for heart conditions, may also serve as early indicators for elevated cancer risk, prompting more integrated prevention strategies.
• Who is affected: Adults without known cardiovascular disease, particularly those exhibiting early signs of cardiac remodeling, as revealed in a long-term multi-ethnic U.S. study.

New Insights into Heart-Cancer Connection

A new study spearheaded by UCLA Health physician-scientists indicates that subtle alterations in heart structure and function could signal a heightened risk for developing certain cancers years later. This pioneering research, published in the Journal of the American Heart Association, highlights potential shared biological pathways between cardiovascular disease and cancer.

According to Dr. Xinjiang Cai, a UCLA Health cardiologist and lead author, the findings suggest that cardiac changes may occur alongside, or even precede, biological processes linked to cancer development. This adds to growing evidence that these two major diseases are deeply intertwined.

Study Methodology and Key Discoveries

The research team analyzed data from the Multi-Ethnic Study of Atherosclerosis (MESA), a long-term U.S. study involving more than 6,000 adults aged 45 to 84, initially free of known cardiovascular disease. Participants were recruited from six urban centers between 2000 and 2002 and included diverse racial and ethnic groups.

Researchers used advanced cardiac MRI imaging at the study's outset to assess baseline cardiac structure and function. Participants were then followed for cancer incidence over an average period of 18 years. The study found that people exhibiting small, early changes in their heart – a process termed “cardiac remodeling” – faced an increased future cancer risk.

Specific Associations Revealed

The study identified several key associations. Increased heart muscle mass was linked to a higher risk of breast cancer. Additionally, reduced left atrial function showed an association with an increased risk of colorectal cancer.

The most pronounced link involved left ventricular mass and breast cancer. After accounting for traditional cardiovascular and cancer risk factors, a higher left ventricular mass index was significantly associated with an increased risk of breast cancer. Similarly, reduced peak left atrial strain, a measure of the left atrium’s ability to contract, was strongly predictive of colorectal cancer risk, with better measurements correlating to substantially lower incidence.

Understanding the Limitations

During the follow-up period, 790 new cancer cases were identified, including breast, colorectal, lung, and prostate cancers. Cancer incidence was observed to rise as measures of cardiac remodeling worsened among participants with available cardiac MRI data.

However, the researchers emphasized that the study demonstrates associations and does not establish causation. Dr. Cai clarified that the results do not mean higher left ventricular mass directly promotes breast cancer or better atrial function directly prevents colorectal cancer. He also noted that other unknown or unmeasured factors might have influenced the findings, stressing the need for the results to be confirmed in additional large population studies.

Implications for Integrated Prevention

Unlike previous studies that relied on elevated cardiac biomarkers or coronary artery calcium scores, this new analysis utilized advanced cardiac MRI to directly measure subtle structural and functional changes in the heart before disease became clinically apparent.

“Early cardiac remodeling may serve as an early marker to identify individuals at risk for both cardiovascular disease and cancer,” said Dr. Cai. “Our study suggests that imaging markers already used to identify people at risk for cardiovascular disease, including heart failure, may also help identify people at elevated risk for cancer.”

The findings advocate for a broader, more integrated approach to prevention. Current heart failure prevention guidelines already recommend aggressive management of blood pressure, obesity, and diabetes. The study suggests these same interventions could also have significant implications for cancer prevention.

What to Watch Next

Further research is crucial to validate these findings in other large population cohorts and to gain a deeper understanding of the biological mechanisms linking early heart disease and cancer development. Collaborative efforts among institutions like UCLA Health, the University of Washington, Johns Hopkins University, and Kyoto University will continue to advance this critical area of medical inquiry.