People
suffering from heart failure may have a nearly 60 percent
higher risk of developing cancer, a preliminary study
suggests. Moreover, cancer appeared to increase the risk of
death in heart failure patients by 46 percent. Heart failure
occurs when the heart can't pump enough blood to keep the
body supplied with oxygen and nutrients. Since patients with
heart failure are at greater risk of dying anyway, the
question is whether developing cancer made death even more
likely. In patients with heart failure, death often occurs
from other causes, such as cancer. More emphasis should be
put on cancer surveillance and prevention in this
population. For the study, researchers collected data on 961
people recently diagnosed with heart failure, comparing them
to similar people without the condition. At the time of
diagnosis, heart failure patients had similar rates of
cancer to those without heart failure. During over six years
of follow-up, the researchers found that the risk for cancer
among heart failure patients was significantly higher than
among those without heart failure. Cancer rates in heart
failure patients were similar for men and women, but people
under 75 were more likely to develop cancer. One expert says
that heart failure patients may be at risk for cancer
because their bodies are already compromised-making another
disease more probable or the finding could be just an
association rather than a direct cause-and-effect
relationship. Certain risk factors for heart failure
including older age, diabetes, obesity and smoking are also
well-established risk factors for cancer. This new analysis
of heart failure patients from a single community suggests
that patients with heart failure may be at increased risk
for developing cancer independent of these established risk
factors, said the investigator. Heart failure activates a
variety of pro-inflammatory pathways which may in turn
increase cancer risk. However, these findings may instead
reflect confounding rather than a true causal relationship.
Further studies are needed to corroborate these findings. |