People with breast cancer and heart problems have high death rate
People that develop breast cancer normally past if they don't receive early treat. It is now been discovered that if the same person had a hart attack or hart problems, the individual also has 60 percent chance of passing if they develop breast cancer according to NYU Grossman School of Medicine.
"By blunting the immune system's assault on cancer cells, a heart attack appears to provide an environment that enables tumor growth," says corresponding author Kathryn Moore, PhD, the Jean and David Blechman Professor of Cardiology, and Director of the Cardiovascular Research Center at NYU Langone Health. "While further studies will be needed, our results provide support for the aggressive clinical management of cardiovascular risk factors, not only to reduce risk of cardiovascular disease, but possibly breast cancer progression."
Findings from the research Cardiovascular Research Center at NYU Langone Health
Past studies had established that having breast cancer increases risk of developing heart disease, due largely to the wear and tear caused by chemotherapy and radiation. While searching the literature, the current team was surprised to find that no lab had yet examined whether heart attacks in turn worsen cancer progression.
To examine the mechanisms behind this link, the authors created a model wherein mice had cancer cells implanted in their breast tissue, and then underwent the surgical closure (ligation) of their left anterior descending coronary artery. The human counterpart of this artery is a common site of blood flow blockage that causes a heart attack, also called myocardial infarction or MI, often triggered by cholesterol deposits or "hardening of the arteries."
The research team then compared cancer growth in mice with and without the ligation, with the non-ligated mice undergoing a sham surgery to account for changes caused by the surgery itself. While the exact biochemical signal responsible has yet to determined, the study found that the heart attack causes system-wide changes to immune cells in bone marrow, the bloodstream, and in tumors.
Firstly, the researchers found that mice with ligation came with a "marked increase" in the number of cells in tumors with surface markers that indicated they were quickly multiplying (Ki67+ cells), a measure of aggressive growth.
Experiments in mice also linked an induced heart attack to a 30 percent increase in the number of white blood cells called monocytes. Such cells are known arise and mature in bone marrow, enter the blood stream, and home in on sites of injury, infection, and abnormalities like tumors.
Furthermore, the authors found that after a heart attack, there was a 60 percent increase in the proportion of immature monocytes in tumors programmed to no longer attack cancer cells there.
Still other tests revealed that heart attack changed the action of 235 genes expressed in these immune cells in mice, many of which would otherwise amplify immune attack. Other important MI-driven changes occurred, not in the gene code, but instead in the protein superstructure that houses the DNA code, making genetic instructions that amplify immune responses less accessible to the machinery meant to read them.